Merge commit 'dec0d4ec4153bf9fc2b78ae6c2df45b6ea8dde7a' as 'external/sdl/SDL'

external/sdl/SDL/src/thread/SDL_systhread.h

@@ -0,0 +1,77 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+/* These are functions that need to be implemented by a port of SDL */
+
+#ifndef SDL_systhread_h_
+#define SDL_systhread_h_
+
+#include "SDL_thread_c.h"
+
+/* Set up for C function definitions, even when using C++ */
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* This function creates a thread, passing args to SDL_RunThread(),
+   saves a system-dependent thread id in thread->id, and returns 0
+   on success.
+*/
+#ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
+extern int SDL_SYS_CreateThread(SDL_Thread *thread,
+                                pfnSDL_CurrentBeginThread pfnBeginThread,
+                                pfnSDL_CurrentEndThread pfnEndThread);
+#else
+extern int SDL_SYS_CreateThread(SDL_Thread *thread);
+#endif
+
+/* This function does any necessary setup in the child thread */
+extern void SDL_SYS_SetupThread(const char *name);
+
+/* This function sets the current thread priority */
+extern int SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority);
+
+/* This function waits for the thread to finish and frees any data
+   allocated by SDL_SYS_CreateThread()
+ */
+extern void SDL_SYS_WaitThread(SDL_Thread *thread);
+
+/* Mark thread as cleaned up as soon as it exits, without joining. */
+extern void SDL_SYS_DetachThread(SDL_Thread *thread);
+
+/* Get the thread local storage for this thread */
+extern SDL_TLSData *SDL_SYS_GetTLSData(void);
+
+/* Set the thread local storage for this thread */
+extern int SDL_SYS_SetTLSData(SDL_TLSData *data);
+
+/* This is for internal SDL use, so we don't need #ifdefs everywhere. */
+extern SDL_Thread *
+SDL_CreateThreadInternal(int(SDLCALL *fn)(void *), const char *name,
+                         const size_t stacksize, void *data);
+
+/* Ends C function definitions when using C++ */
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* SDL_systhread_h_ */

external/sdl/SDL/src/thread/SDL_thread.c

@@ -0,0 +1,510 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+/* System independent thread management routines for SDL */
+
+#include "SDL_thread_c.h"
+#include "SDL_systhread.h"
+#include "../SDL_error_c.h"
+
+SDL_TLSID SDL_CreateTLS(void)
+{
+    static SDL_AtomicInt SDL_tls_id;
+    return SDL_AtomicIncRef(&SDL_tls_id) + 1;
+}
+
+void *SDL_GetTLS(SDL_TLSID id)
+{
+    SDL_TLSData *storage;
+
+    storage = SDL_SYS_GetTLSData();
+    if (storage == NULL || id == 0 || id > storage->limit) {
+        return NULL;
+    }
+    return storage->array[id - 1].data;
+}
+
+int SDL_SetTLS(SDL_TLSID id, const void *value, void(SDLCALL *destructor)(void *))
+{
+    SDL_TLSData *storage;
+
+    if (id == 0) {
+        return SDL_InvalidParamError("id");
+    }
+
+    storage = SDL_SYS_GetTLSData();
+    if (storage == NULL || (id > storage->limit)) {
+        unsigned int i, oldlimit, newlimit;
+
+        oldlimit = storage ? storage->limit : 0;
+        newlimit = (id + TLS_ALLOC_CHUNKSIZE);
+        storage = (SDL_TLSData *)SDL_realloc(storage, sizeof(*storage) + (newlimit - 1) * sizeof(storage->array[0]));
+        if (storage == NULL) {
+            return SDL_OutOfMemory();
+        }
+        storage->limit = newlimit;
+        for (i = oldlimit; i < newlimit; ++i) {
+            storage->array[i].data = NULL;
+            storage->array[i].destructor = NULL;
+        }
+        if (SDL_SYS_SetTLSData(storage) != 0) {
+            return -1;
+        }
+    }
+
+    storage->array[id - 1].data = SDL_const_cast(void *, value);
+    storage->array[id - 1].destructor = destructor;
+    return 0;
+}
+
+void SDL_CleanupTLS(void)
+{
+    SDL_TLSData *storage;
+
+    storage = SDL_SYS_GetTLSData();
+    if (storage) {
+        unsigned int i;
+        for (i = 0; i < storage->limit; ++i) {
+            if (storage->array[i].destructor) {
+                storage->array[i].destructor(storage->array[i].data);
+            }
+        }
+        SDL_SYS_SetTLSData(NULL);
+        SDL_free(storage);
+    }
+}
+
+/* This is a generic implementation of thread-local storage which doesn't
+   require additional OS support.
+
+   It is not especially efficient and doesn't clean up thread-local storage
+   as threads exit.  If there is a real OS that doesn't support thread-local
+   storage this implementation should be improved to be production quality.
+*/
+
+typedef struct SDL_TLSEntry
+{
+    SDL_threadID thread;
+    SDL_TLSData *storage;
+    struct SDL_TLSEntry *next;
+} SDL_TLSEntry;
+
+static SDL_Mutex *SDL_generic_TLS_mutex;
+static SDL_TLSEntry *SDL_generic_TLS;
+
+SDL_TLSData *SDL_Generic_GetTLSData(void)
+{
+    SDL_threadID thread = SDL_ThreadID();
+    SDL_TLSEntry *entry;
+    SDL_TLSData *storage = NULL;
+
+#ifndef SDL_THREADS_DISABLED
+    if (SDL_generic_TLS_mutex == NULL) {
+        static SDL_SpinLock tls_lock;
+        SDL_AtomicLock(&tls_lock);
+        if (SDL_generic_TLS_mutex == NULL) {
+            SDL_Mutex *mutex = SDL_CreateMutex();
+            SDL_MemoryBarrierRelease();
+            SDL_generic_TLS_mutex = mutex;
+            if (SDL_generic_TLS_mutex == NULL) {
+                SDL_AtomicUnlock(&tls_lock);
+                return NULL;
+            }
+        }
+        SDL_AtomicUnlock(&tls_lock);
+    }
+    SDL_MemoryBarrierAcquire();
+    SDL_LockMutex(SDL_generic_TLS_mutex);
+#endif /* SDL_THREADS_DISABLED */
+
+    for (entry = SDL_generic_TLS; entry; entry = entry->next) {
+        if (entry->thread == thread) {
+            storage = entry->storage;
+            break;
+        }
+    }
+#ifndef SDL_THREADS_DISABLED
+    SDL_UnlockMutex(SDL_generic_TLS_mutex);
+#endif
+
+    return storage;
+}
+
+int SDL_Generic_SetTLSData(SDL_TLSData *data)
+{
+    SDL_threadID thread = SDL_ThreadID();
+    SDL_TLSEntry *prev, *entry;
+
+    /* SDL_Generic_GetTLSData() is always called first, so we can assume SDL_generic_TLS_mutex */
+    SDL_LockMutex(SDL_generic_TLS_mutex);
+    prev = NULL;
+    for (entry = SDL_generic_TLS; entry; entry = entry->next) {
+        if (entry->thread == thread) {
+            if (data != NULL) {
+                entry->storage = data;
+            } else {
+                if (prev != NULL) {
+                    prev->next = entry->next;
+                } else {
+                    SDL_generic_TLS = entry->next;
+                }
+                SDL_free(entry);
+            }
+            break;
+        }
+        prev = entry;
+    }
+    if (entry == NULL) {
+        entry = (SDL_TLSEntry *)SDL_malloc(sizeof(*entry));
+        if (entry) {
+            entry->thread = thread;
+            entry->storage = data;
+            entry->next = SDL_generic_TLS;
+            SDL_generic_TLS = entry;
+        }
+    }
+    SDL_UnlockMutex(SDL_generic_TLS_mutex);
+
+    if (entry == NULL) {
+        return SDL_OutOfMemory();
+    }
+    return 0;
+}
+
+/* Non-thread-safe global error variable */
+static SDL_error *SDL_GetStaticErrBuf(void)
+{
+    static SDL_error SDL_global_error;
+    static char SDL_global_error_str[128];
+    SDL_global_error.str = SDL_global_error_str;
+    SDL_global_error.len = sizeof(SDL_global_error_str);
+    return &SDL_global_error;
+}
+
+#ifndef SDL_THREADS_DISABLED
+static void SDLCALL SDL_FreeErrBuf(void *data)
+{
+    SDL_error *errbuf = (SDL_error *)data;
+
+    if (errbuf->str) {
+        errbuf->free_func(errbuf->str);
+    }
+    errbuf->free_func(errbuf);
+}
+#endif
+
+/* Routine to get the thread-specific error variable */
+SDL_error *SDL_GetErrBuf(void)
+{
+#ifdef SDL_THREADS_DISABLED
+    return SDL_GetStaticErrBuf();
+#else
+    static SDL_SpinLock tls_lock;
+    static SDL_bool tls_being_created;
+    static SDL_TLSID tls_errbuf;
+    const SDL_error *ALLOCATION_IN_PROGRESS = (SDL_error *)-1;
+    SDL_error *errbuf;
+
+    /* tls_being_created is there simply to prevent recursion if SDL_CreateTLS() fails.
+       It also means it's possible for another thread to also use SDL_global_errbuf,
+       but that's very unlikely and hopefully won't cause issues.
+     */
+    if (!tls_errbuf && !tls_being_created) {
+        SDL_AtomicLock(&tls_lock);
+        if (!tls_errbuf) {
+            SDL_TLSID slot;
+            tls_being_created = SDL_TRUE;
+            slot = SDL_CreateTLS();
+            tls_being_created = SDL_FALSE;
+            SDL_MemoryBarrierRelease();
+            tls_errbuf = slot;
+        }
+        SDL_AtomicUnlock(&tls_lock);
+    }
+    if (!tls_errbuf) {
+        return SDL_GetStaticErrBuf();
+    }
+
+    SDL_MemoryBarrierAcquire();
+    errbuf = (SDL_error *)SDL_GetTLS(tls_errbuf);
+    if (errbuf == ALLOCATION_IN_PROGRESS) {
+        return SDL_GetStaticErrBuf();
+    }
+    if (errbuf == NULL) {
+        /* Get the original memory functions for this allocation because the lifetime
+         * of the error buffer may span calls to SDL_SetMemoryFunctions() by the app
+         */
+        SDL_realloc_func realloc_func;
+        SDL_free_func free_func;
+        SDL_GetOriginalMemoryFunctions(NULL, NULL, &realloc_func, &free_func);
+
+        /* Mark that we're in the middle of allocating our buffer */
+        SDL_SetTLS(tls_errbuf, ALLOCATION_IN_PROGRESS, NULL);
+        errbuf = (SDL_error *)realloc_func(NULL, sizeof(*errbuf));
+        if (errbuf == NULL) {
+            SDL_SetTLS(tls_errbuf, NULL, NULL);
+            return SDL_GetStaticErrBuf();
+        }
+        SDL_zerop(errbuf);
+        errbuf->realloc_func = realloc_func;
+        errbuf->free_func = free_func;
+        SDL_SetTLS(tls_errbuf, errbuf, SDL_FreeErrBuf);
+    }
+    return errbuf;
+#endif /* SDL_THREADS_DISABLED */
+}
+
+void SDL_RunThread(SDL_Thread *thread)
+{
+    void *userdata = thread->userdata;
+    int(SDLCALL * userfunc)(void *) = thread->userfunc;
+
+    int *statusloc = &thread->status;
+
+    /* Perform any system-dependent setup - this function may not fail */
+    SDL_SYS_SetupThread(thread->name);
+
+    /* Get the thread id */
+    thread->threadid = SDL_ThreadID();
+
+    /* Run the function */
+    *statusloc = userfunc(userdata);
+
+    /* Clean up thread-local storage */
+    SDL_CleanupTLS();
+
+    /* Mark us as ready to be joined (or detached) */
+    if (!SDL_AtomicCAS(&thread->state, SDL_THREAD_STATE_ALIVE, SDL_THREAD_STATE_ZOMBIE)) {
+        /* Clean up if something already detached us. */
+        if (SDL_AtomicCAS(&thread->state, SDL_THREAD_STATE_DETACHED, SDL_THREAD_STATE_CLEANED)) {
+            if (thread->name) {
+                SDL_free(thread->name);
+            }
+            SDL_free(thread);
+        }
+    }
+}
+
+#ifdef SDL_CreateThread
+#undef SDL_CreateThread
+#undef SDL_CreateThreadWithStackSize
+#endif
+#if SDL_DYNAMIC_API
+#define SDL_CreateThread              SDL_CreateThread_REAL
+#define SDL_CreateThreadWithStackSize SDL_CreateThreadWithStackSize_REAL
+#endif
+
+#ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
+SDL_Thread *SDL_CreateThreadWithStackSize(int(SDLCALL *fn)(void *),
+                              const char *name, const size_t stacksize, void *data,
+                              pfnSDL_CurrentBeginThread pfnBeginThread,
+                              pfnSDL_CurrentEndThread pfnEndThread)
+#else
+SDL_Thread *SDL_CreateThreadWithStackSize(int(SDLCALL *fn)(void *),
+                              const char *name, const size_t stacksize, void *data)
+#endif
+{
+    SDL_Thread *thread;
+    int ret;
+
+    /* Allocate memory for the thread info structure */
+    thread = (SDL_Thread *)SDL_calloc(1, sizeof(*thread));
+    if (thread == NULL) {
+        SDL_OutOfMemory();
+        return NULL;
+    }
+    thread->status = -1;
+    SDL_AtomicSet(&thread->state, SDL_THREAD_STATE_ALIVE);
+
+    /* Set up the arguments for the thread */
+    if (name != NULL) {
+        thread->name = SDL_strdup(name);
+        if (thread->name == NULL) {
+            SDL_OutOfMemory();
+            SDL_free(thread);
+            return NULL;
+        }
+    }
+
+    thread->userfunc = fn;
+    thread->userdata = data;
+    thread->stacksize = stacksize;
+
+    /* Create the thread and go! */
+#ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
+    ret = SDL_SYS_CreateThread(thread, pfnBeginThread, pfnEndThread);
+#else
+    ret = SDL_SYS_CreateThread(thread);
+#endif
+    if (ret < 0) {
+        /* Oops, failed.  Gotta free everything */
+        SDL_free(thread->name);
+        SDL_free(thread);
+        thread = NULL;
+    }
+
+    /* Everything is running now */
+    return thread;
+}
+
+#ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
+DECLSPEC SDL_Thread *SDLCALL SDL_CreateThread(int(SDLCALL *fn)(void *),
+                 const char *name, void *data,
+                 pfnSDL_CurrentBeginThread pfnBeginThread,
+                 pfnSDL_CurrentEndThread pfnEndThread)
+#else
+DECLSPEC SDL_Thread *SDLCALL SDL_CreateThread(int(SDLCALL *fn)(void *),
+                 const char *name, void *data)
+#endif
+{
+    /* !!! FIXME: in 2.1, just make stackhint part of the usual API. */
+    const char *stackhint = SDL_GetHint(SDL_HINT_THREAD_STACK_SIZE);
+    size_t stacksize = 0;
+
+    /* If the SDL_HINT_THREAD_STACK_SIZE exists, use it */
+    if (stackhint != NULL) {
+        char *endp = NULL;
+        const Sint64 hintval = SDL_strtoll(stackhint, &endp, 10);
+        if ((*stackhint != '\0') && (*endp == '\0')) { /* a valid number? */
+            if (hintval > 0) {                         /* reject bogus values. */
+                stacksize = (size_t)hintval;
+            }
+        }
+    }
+
+#ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
+    return SDL_CreateThreadWithStackSize(fn, name, stacksize, data, pfnBeginThread, pfnEndThread);
+#else
+    return SDL_CreateThreadWithStackSize(fn, name, stacksize, data);
+#endif
+}
+
+SDL_Thread *SDL_CreateThreadInternal(int(SDLCALL *fn)(void *), const char *name,
+                         const size_t stacksize, void *data)
+{
+#ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
+    return SDL_CreateThreadWithStackSize(fn, name, stacksize, data, NULL, NULL);
+#else
+    return SDL_CreateThreadWithStackSize(fn, name, stacksize, data);
+#endif
+}
+
+SDL_threadID SDL_GetThreadID(SDL_Thread *thread)
+{
+    SDL_threadID id;
+
+    if (thread) {
+        id = thread->threadid;
+    } else {
+        id = SDL_ThreadID();
+    }
+    return id;
+}
+
+const char *SDL_GetThreadName(SDL_Thread *thread)
+{
+    if (thread) {
+        return thread->name;
+    } else {
+        return NULL;
+    }
+}
+
+int SDL_SetThreadPriority(SDL_ThreadPriority priority)
+{
+    return SDL_SYS_SetThreadPriority(priority);
+}
+
+void SDL_WaitThread(SDL_Thread *thread, int *status)
+{
+    if (thread) {
+        SDL_SYS_WaitThread(thread);
+        if (status) {
+            *status = thread->status;
+        }
+        if (thread->name) {
+            SDL_free(thread->name);
+        }
+        SDL_free(thread);
+    }
+}
+
+void SDL_DetachThread(SDL_Thread *thread)
+{
+    if (thread == NULL) {
+        return;
+    }
+
+    /* Grab dibs if the state is alive+joinable. */
+    if (SDL_AtomicCAS(&thread->state, SDL_THREAD_STATE_ALIVE, SDL_THREAD_STATE_DETACHED)) {
+        SDL_SYS_DetachThread(thread);
+    } else {
+        /* all other states are pretty final, see where we landed. */
+        const int thread_state = SDL_AtomicGet(&thread->state);
+        if ((thread_state == SDL_THREAD_STATE_DETACHED) || (thread_state == SDL_THREAD_STATE_CLEANED)) {
+            return; /* already detached (you shouldn't call this twice!) */
+        } else if (thread_state == SDL_THREAD_STATE_ZOMBIE) {
+            SDL_WaitThread(thread, NULL); /* already done, clean it up. */
+        } else {
+            SDL_assert(0 && "Unexpected thread state");
+        }
+    }
+}
+
+int SDL_WaitSemaphore(SDL_Semaphore *sem)
+{
+    return SDL_WaitSemaphoreTimeoutNS(sem, SDL_MUTEX_MAXWAIT);
+}
+
+int SDL_TryWaitSemaphore(SDL_Semaphore *sem)
+{
+    return SDL_WaitSemaphoreTimeoutNS(sem, 0);
+}
+
+int SDL_WaitSemaphoreTimeout(SDL_Semaphore *sem, Sint32 timeoutMS)
+{
+    Sint64 timeoutNS;
+
+    if (timeoutMS >= 0) {
+        timeoutNS = SDL_MS_TO_NS(timeoutMS);
+    } else {
+        timeoutNS = -1;
+    }
+    return SDL_WaitSemaphoreTimeoutNS(sem, timeoutNS);
+}
+
+int SDL_WaitCondition(SDL_Condition *cond, SDL_Mutex *mutex)
+{
+    return SDL_WaitConditionTimeoutNS(cond, mutex, SDL_MUTEX_MAXWAIT);
+}
+
+int SDL_WaitConditionTimeout(SDL_Condition *cond, SDL_Mutex *mutex, Sint32 timeoutMS)
+{
+    Sint64 timeoutNS;
+
+    if (timeoutMS >= 0) {
+        timeoutNS = SDL_MS_TO_NS(timeoutMS);
+    } else {
+        timeoutNS = -1;
+    }
+    return SDL_WaitConditionTimeoutNS(cond, mutex, timeoutNS);
+}

external/sdl/SDL/src/thread/SDL_thread_c.h

@@ -0,0 +1,104 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifndef SDL_thread_c_h_
+#define SDL_thread_c_h_
+
+/* Need the definitions of SYS_ThreadHandle */
+#ifdef SDL_THREADS_DISABLED
+#include "generic/SDL_systhread_c.h"
+#elif defined(SDL_THREAD_PTHREAD)
+#include "pthread/SDL_systhread_c.h"
+#elif defined(SDL_THREAD_WINDOWS)
+#include "windows/SDL_systhread_c.h"
+#elif defined(SDL_THREAD_PS2)
+#include "ps2/SDL_systhread_c.h"
+#elif defined(SDL_THREAD_PSP)
+#include "psp/SDL_systhread_c.h"
+#elif defined(SDL_THREAD_VITA)
+#include "vita/SDL_systhread_c.h"
+#elif defined(SDL_THREAD_N3DS)
+#include "n3ds/SDL_systhread_c.h"
+#elif defined(SDL_THREAD_STDCPP)
+#include "stdcpp/SDL_systhread_c.h"
+#elif defined(SDL_THREAD_NGAGE)
+#include "ngage/SDL_systhread_c.h"
+#else
+#error Need thread implementation for this platform
+#include "generic/SDL_systhread_c.h"
+#endif
+#include "../SDL_error_c.h"
+
+typedef enum SDL_ThreadState
+{
+    SDL_THREAD_STATE_ALIVE,
+    SDL_THREAD_STATE_DETACHED,
+    SDL_THREAD_STATE_ZOMBIE,
+    SDL_THREAD_STATE_CLEANED,
+} SDL_ThreadState;
+
+/* This is the system-independent thread info structure */
+struct SDL_Thread
+{
+    SDL_threadID threadid;
+    SYS_ThreadHandle handle;
+    int status;
+    SDL_AtomicInt state; /* SDL_THREAD_STATE_* */
+    SDL_error errbuf;
+    char *name;
+    size_t stacksize; /* 0 for default, >0 for user-specified stack size. */
+    int(SDLCALL *userfunc)(void *);
+    void *userdata;
+    void *data;
+    void *endfunc; /* only used on some platforms. */
+};
+
+/* This is the function called to run a thread */
+extern void SDL_RunThread(SDL_Thread *thread);
+
+/* This is the system-independent thread local storage structure */
+typedef struct
+{
+    unsigned int limit;
+    struct
+    {
+        void *data;
+        void(SDLCALL *destructor)(void *);
+    } array[1];
+} SDL_TLSData;
+
+/* This is how many TLS entries we allocate at once */
+#define TLS_ALLOC_CHUNKSIZE 4
+
+/* Get cross-platform, slow, thread local storage for this thread.
+   This is only intended as a fallback if getting real thread-local
+   storage fails or isn't supported on this platform.
+ */
+extern SDL_TLSData *SDL_Generic_GetTLSData(void);
+
+/* Set cross-platform, slow, thread local storage for this thread.
+   This is only intended as a fallback if getting real thread-local
+   storage fails or isn't supported on this platform.
+ */
+extern int SDL_Generic_SetTLSData(SDL_TLSData *data);
+
+#endif /* SDL_thread_c_h_ */

external/sdl/SDL/src/thread/generic/SDL_syscond.c

@@ -0,0 +1,218 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+/* An implementation of condition variables using semaphores and mutexes */
+/*
+   This implementation borrows heavily from the BeOS condition variable
+   implementation, written by Christopher Tate and Owen Smith.  Thanks!
+ */
+
+#include "../generic/SDL_syscond_c.h"
+
+/* If two implementations are to be compiled into SDL (the active one
+ * will be chosen at runtime), the function names need to be
+ * suffixed
+ */
+#ifndef SDL_THREAD_GENERIC_COND_SUFFIX
+#define SDL_CreateCondition_generic      SDL_CreateCondition
+#define SDL_DestroyCondition_generic     SDL_DestroyCondition
+#define SDL_SignalCondition_generic      SDL_SignalCondition
+#define SDL_BroadcastCondition_generic   SDL_BroadcastCondition
+#define SDL_WaitConditionTimeoutNS_generic SDL_WaitConditionTimeoutNS
+#endif
+
+typedef struct SDL_cond_generic
+{
+    SDL_Mutex *lock;
+    int waiting;
+    int signals;
+    SDL_Semaphore *wait_sem;
+    SDL_Semaphore *wait_done;
+} SDL_cond_generic;
+
+/* Create a condition variable */
+SDL_Condition *SDL_CreateCondition_generic(void)
+{
+    SDL_cond_generic *cond;
+
+    cond = (SDL_cond_generic *)SDL_malloc(sizeof(SDL_cond_generic));
+    if (cond) {
+        cond->lock = SDL_CreateMutex();
+        cond->wait_sem = SDL_CreateSemaphore(0);
+        cond->wait_done = SDL_CreateSemaphore(0);
+        cond->waiting = cond->signals = 0;
+        if (!cond->lock || !cond->wait_sem || !cond->wait_done) {
+            SDL_DestroyCondition_generic((SDL_Condition *)cond);
+            cond = NULL;
+        }
+    } else {
+        SDL_OutOfMemory();
+    }
+    return (SDL_Condition *)cond;
+}
+
+/* Destroy a condition variable */
+void SDL_DestroyCondition_generic(SDL_Condition *_cond)
+{
+    SDL_cond_generic *cond = (SDL_cond_generic *)_cond;
+    if (cond) {
+        if (cond->wait_sem) {
+            SDL_DestroySemaphore(cond->wait_sem);
+        }
+        if (cond->wait_done) {
+            SDL_DestroySemaphore(cond->wait_done);
+        }
+        if (cond->lock) {
+            SDL_DestroyMutex(cond->lock);
+        }
+        SDL_free(cond);
+    }
+}
+
+/* Restart one of the threads that are waiting on the condition variable */
+int SDL_SignalCondition_generic(SDL_Condition *_cond)
+{
+    SDL_cond_generic *cond = (SDL_cond_generic *)_cond;
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+
+    /* If there are waiting threads not already signalled, then
+       signal the condition and wait for the thread to respond.
+     */
+    SDL_LockMutex(cond->lock);
+    if (cond->waiting > cond->signals) {
+        ++cond->signals;
+        SDL_PostSemaphore(cond->wait_sem);
+        SDL_UnlockMutex(cond->lock);
+        SDL_WaitSemaphore(cond->wait_done);
+    } else {
+        SDL_UnlockMutex(cond->lock);
+    }
+
+    return 0;
+}
+
+/* Restart all threads that are waiting on the condition variable */
+int SDL_BroadcastCondition_generic(SDL_Condition *_cond)
+{
+    SDL_cond_generic *cond = (SDL_cond_generic *)_cond;
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+
+    /* If there are waiting threads not already signalled, then
+       signal the condition and wait for the thread to respond.
+     */
+    SDL_LockMutex(cond->lock);
+    if (cond->waiting > cond->signals) {
+        int i, num_waiting;
+
+        num_waiting = (cond->waiting - cond->signals);
+        cond->signals = cond->waiting;
+        for (i = 0; i < num_waiting; ++i) {
+            SDL_PostSemaphore(cond->wait_sem);
+        }
+        /* Now all released threads are blocked here, waiting for us.
+           Collect them all (and win fabulous prizes!) :-)
+         */
+        SDL_UnlockMutex(cond->lock);
+        for (i = 0; i < num_waiting; ++i) {
+            SDL_WaitSemaphore(cond->wait_done);
+        }
+    } else {
+        SDL_UnlockMutex(cond->lock);
+    }
+
+    return 0;
+}
+
+/* Wait on the condition variable for at most 'timeoutNS' nanoseconds.
+   The mutex must be locked before entering this function!
+   The mutex is unlocked during the wait, and locked again after the wait.
+
+Typical use:
+
+Thread A:
+    SDL_LockMutex(lock);
+    while ( ! condition ) {
+        SDL_WaitCondition(cond, lock);
+    }
+    SDL_UnlockMutex(lock);
+
+Thread B:
+    SDL_LockMutex(lock);
+    ...
+    condition = true;
+    ...
+    SDL_SignalCondition(cond);
+    SDL_UnlockMutex(lock);
+ */
+int SDL_WaitConditionTimeoutNS_generic(SDL_Condition *_cond, SDL_Mutex *mutex, Sint64 timeoutNS)
+{
+    SDL_cond_generic *cond = (SDL_cond_generic *)_cond;
+    int retval;
+
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+
+    /* Obtain the protection mutex, and increment the number of waiters.
+       This allows the signal mechanism to only perform a signal if there
+       are waiting threads.
+     */
+    SDL_LockMutex(cond->lock);
+    ++cond->waiting;
+    SDL_UnlockMutex(cond->lock);
+
+    /* Unlock the mutex, as is required by condition variable semantics */
+    SDL_UnlockMutex(mutex);
+
+    /* Wait for a signal */
+    retval = SDL_WaitSemaphoreTimeoutNS(cond->wait_sem, timeoutNS);
+
+    /* Let the signaler know we have completed the wait, otherwise
+       the signaler can race ahead and get the condition semaphore
+       if we are stopped between the mutex unlock and semaphore wait,
+       giving a deadlock.  See the following URL for details:
+       http://web.archive.org/web/20010914175514/http://www-classic.be.com/aboutbe/benewsletter/volume_III/Issue40.html#Workshop
+     */
+    SDL_LockMutex(cond->lock);
+    if (cond->signals > 0) {
+        /* If we timed out, we need to eat a condition signal */
+        if (retval > 0) {
+            SDL_WaitSemaphore(cond->wait_sem);
+        }
+        /* We always notify the signal thread that we are done */
+        SDL_PostSemaphore(cond->wait_done);
+
+        /* Signal handshake complete */
+        --cond->signals;
+    }
+    --cond->waiting;
+    SDL_UnlockMutex(cond->lock);
+
+    /* Lock the mutex, as is required by condition variable semantics */
+    SDL_LockMutex(mutex);
+
+    return retval;
+}

external/sdl/SDL/src/thread/generic/SDL_syscond_c.h

@@ -0,0 +1,36 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifndef SDL_syscond_generic_h_
+#define SDL_syscond_generic_h_
+
+#ifdef SDL_THREAD_GENERIC_COND_SUFFIX
+
+SDL_Condition *SDL_CreateCondition_generic(void);
+void SDL_DestroyCondition_generic(SDL_Condition *cond);
+int SDL_SignalCondition_generic(SDL_Condition *cond);
+int SDL_BroadcastCondition_generic(SDL_Condition *cond);
+int SDL_WaitConditionTimeoutNS_generic(SDL_Condition *cond, SDL_Mutex *mutex, Sint64 timeoutNS);
+
+#endif /* SDL_THREAD_GENERIC_COND_SUFFIX */
+
+#endif /* SDL_syscond_generic_h_ */

external/sdl/SDL/src/thread/generic/SDL_sysmutex.c

@@ -0,0 +1,161 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+/* An implementation of mutexes using semaphores */
+
+#include "SDL_systhread_c.h"
+
+struct SDL_Mutex
+{
+    int recursive;
+    SDL_threadID owner;
+    SDL_Semaphore *sem;
+};
+
+/* Create a mutex */
+SDL_Mutex *SDL_CreateMutex(void)
+{
+    SDL_Mutex *mutex;
+
+    /* Allocate mutex memory */
+    mutex = (SDL_Mutex *)SDL_calloc(1, sizeof(*mutex));
+
+#ifndef SDL_THREADS_DISABLED
+    if (mutex) {
+        /* Create the mutex semaphore, with initial value 1 */
+        mutex->sem = SDL_CreateSemaphore(1);
+        mutex->recursive = 0;
+        mutex->owner = 0;
+        if (!mutex->sem) {
+            SDL_free(mutex);
+            mutex = NULL;
+        }
+    } else {
+        SDL_OutOfMemory();
+    }
+#endif /* !SDL_THREADS_DISABLED */
+
+    return mutex;
+}
+
+/* Free the mutex */
+void SDL_DestroyMutex(SDL_Mutex *mutex)
+{
+    if (mutex) {
+        if (mutex->sem) {
+            SDL_DestroySemaphore(mutex->sem);
+        }
+        SDL_free(mutex);
+    }
+}
+
+/* Lock the mutex */
+int SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+#ifdef SDL_THREADS_DISABLED
+    return 0;
+#else
+    SDL_threadID this_thread;
+
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    this_thread = SDL_ThreadID();
+    if (mutex->owner == this_thread) {
+        ++mutex->recursive;
+    } else {
+        /* The order of operations is important.
+           We set the locking thread id after we obtain the lock
+           so unlocks from other threads will fail.
+         */
+        SDL_WaitSemaphore(mutex->sem);
+        mutex->owner = this_thread;
+        mutex->recursive = 0;
+    }
+
+    return 0;
+#endif /* SDL_THREADS_DISABLED */
+}
+
+/* try Lock the mutex */
+int SDL_TryLockMutex(SDL_Mutex *mutex)
+{
+#ifdef SDL_THREADS_DISABLED
+    return 0;
+#else
+    int retval = 0;
+    SDL_threadID this_thread;
+
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    this_thread = SDL_ThreadID();
+    if (mutex->owner == this_thread) {
+        ++mutex->recursive;
+    } else {
+        /* The order of operations is important.
+         We set the locking thread id after we obtain the lock
+         so unlocks from other threads will fail.
+         */
+        retval = SDL_WaitSemaphore(mutex->sem);
+        if (retval == 0) {
+            mutex->owner = this_thread;
+            mutex->recursive = 0;
+        }
+    }
+
+    return retval;
+#endif /* SDL_THREADS_DISABLED */
+}
+
+/* Unlock the mutex */
+int SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+#ifdef SDL_THREADS_DISABLED
+    return 0;
+#else
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    /* If we don't own the mutex, we can't unlock it */
+    if (SDL_ThreadID() != mutex->owner) {
+        return SDL_SetError("mutex not owned by this thread");
+    }
+
+    if (mutex->recursive) {
+        --mutex->recursive;
+    } else {
+        /* The order of operations is important.
+           First reset the owner so another thread doesn't lock
+           the mutex and set the ownership before we reset it,
+           then release the lock semaphore.
+         */
+        mutex->owner = 0;
+        SDL_PostSemaphore(mutex->sem);
+    }
+    return 0;
+#endif /* SDL_THREADS_DISABLED */
+}
+

external/sdl/SDL/src/thread/generic/SDL_sysmutex_c.h

@@ -0,0 +1,21 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"

external/sdl/SDL/src/thread/generic/SDL_sysrwlock.c

@@ -0,0 +1,185 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+/* An implementation of rwlocks using mutexes, condition variables, and atomics. */
+
+#include "SDL_systhread_c.h"
+
+#include "../generic/SDL_sysrwlock_c.h"
+
+/* If two implementations are to be compiled into SDL (the active one
+ * will be chosen at runtime), the function names need to be
+ * suffixed
+ */
+/* !!! FIXME: this is quite a tapdance with macros and the build system, maybe we can simplify how we do this. --ryan. */
+#ifndef SDL_THREAD_GENERIC_RWLOCK_SUFFIX
+#define SDL_CreateRWLock_generic SDL_CreateRWLock
+#define SDL_DestroyRWLock_generic SDL_DestroyRWLock
+#define SDL_LockRWLockForReading_generic SDL_LockRWLockForReading
+#define SDL_LockRWLockForWriting_generic SDL_LockRWLockForWriting
+#define SDL_TryLockRWLockForReading_generic SDL_TryLockRWLockForReading
+#define SDL_TryLockRWLockForWriting_generic SDL_TryLockRWLockForWriting
+#define SDL_UnlockRWLock_generic SDL_UnlockRWLock
+#endif
+
+struct SDL_RWLock
+{
+    SDL_Mutex *lock;
+    SDL_Condition *condition;
+    SDL_threadID writer_thread;
+    SDL_AtomicInt reader_count;
+    SDL_AtomicInt writer_count;
+};
+
+SDL_RWLock *SDL_CreateRWLock_generic(void)
+{
+    SDL_RWLock *rwlock = (SDL_RWLock *) SDL_malloc(sizeof (*rwlock));
+
+    if (!rwlock) {
+        SDL_OutOfMemory();
+        return NULL;
+    }
+
+    rwlock->lock = SDL_CreateMutex();
+    if (!rwlock->lock) {
+        SDL_free(rwlock);
+        return NULL;
+    }
+
+    rwlock->condition = SDL_CreateCondition();
+    if (!rwlock->condition) {
+        SDL_DestroyMutex(rwlock->lock);
+        SDL_free(rwlock);
+        return NULL;
+    }
+
+    SDL_AtomicSet(&rwlock->reader_count, 0);
+    SDL_AtomicSet(&rwlock->writer_count, 0);
+
+    return rwlock;
+}
+
+void SDL_DestroyRWLock_generic(SDL_RWLock *rwlock)
+{
+    if (rwlock) {
+        SDL_DestroyMutex(rwlock->lock);
+        SDL_DestroyCondition(rwlock->condition);
+        SDL_free(rwlock);
+    }
+}
+
+int SDL_LockRWLockForReading_generic(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    if (!rwlock) {
+        return SDL_InvalidParamError("rwlock");
+    } else if (SDL_LockMutex(rwlock->lock) == -1) {
+        return -1;
+    }
+
+    SDL_assert(SDL_AtomicGet(&rwlock->writer_count) == 0);  /* shouldn't be able to grab lock if there's a writer! */
+
+    SDL_AtomicAdd(&rwlock->reader_count, 1);
+    SDL_UnlockMutex(rwlock->lock);   /* other readers can attempt to share the lock. */
+    return 0;
+}
+
+int SDL_LockRWLockForWriting_generic(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    if (!rwlock) {
+        return SDL_InvalidParamError("rwlock");
+    } else if (SDL_LockMutex(rwlock->lock) == -1) {
+        return -1;
+    }
+
+    while (SDL_AtomicGet(&rwlock->reader_count) > 0) {  /* while something is holding the shared lock, keep waiting. */
+        SDL_WaitCondition(rwlock->condition, rwlock->lock);  /* release the lock and wait for readers holding the shared lock to release it, regrab the lock. */
+    }
+
+    /* we hold the lock! */
+    SDL_AtomicAdd(&rwlock->writer_count, 1);  /* we let these be recursive, but the API doesn't require this. It _does_ trust you unlock correctly! */
+
+    return 0;
+}
+
+int SDL_TryLockRWLockForReading_generic(SDL_RWLock *rwlock)
+{
+    int rc;
+
+    if (!rwlock) {
+        return SDL_InvalidParamError("rwlock");
+    }
+
+    rc = SDL_TryLockMutex(rwlock->lock);
+    if (rc != 0) {
+        /* !!! FIXME: there is a small window where a reader has to lock the mutex, and if we hit that, we will return SDL_RWLOCK_TIMEDOUT even though we could have shared the lock. */
+        return rc;
+    }
+
+    SDL_assert(SDL_AtomicGet(&rwlock->writer_count) == 0);  /* shouldn't be able to grab lock if there's a writer! */
+
+    SDL_AtomicAdd(&rwlock->reader_count, 1);
+    SDL_UnlockMutex(rwlock->lock);   /* other readers can attempt to share the lock. */
+    return 0;
+}
+
+int SDL_TryLockRWLockForWriting_generic(SDL_RWLock *rwlock)
+{
+    int rc;
+
+    if (!rwlock) {
+        return SDL_InvalidParamError("rwlock");
+    } else if ((rc = SDL_TryLockMutex(rwlock->lock)) != 0) {
+        return rc;
+    }
+
+    if (SDL_AtomicGet(&rwlock->reader_count) > 0) {  /* a reader is using the shared lock, treat it as unavailable. */
+        SDL_UnlockMutex(rwlock->lock);
+        return SDL_RWLOCK_TIMEDOUT;
+    }
+
+    /* we hold the lock! */
+    SDL_AtomicAdd(&rwlock->writer_count, 1);  /* we let these be recursive, but the API doesn't require this. It _does_ trust you unlock correctly! */
+
+    return 0;
+}
+
+int SDL_UnlockRWLock_generic(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    if (!rwlock) {
+        return SDL_InvalidParamError("rwlock");
+    }
+
+    SDL_LockMutex(rwlock->lock);  /* recursive lock for writers, readers grab lock to make sure things are sane. */
+
+    if (SDL_AtomicGet(&rwlock->reader_count) > 0) {  /* we're a reader */
+        SDL_AtomicAdd(&rwlock->reader_count, -1);
+        SDL_BroadcastCondition(rwlock->condition);  /* alert any pending writers to attempt to try to grab the lock again. */
+    } else if (SDL_AtomicGet(&rwlock->writer_count) > 0) {  /* we're a writer */
+        SDL_AtomicAdd(&rwlock->writer_count, -1);
+        SDL_UnlockMutex(rwlock->lock);  /* recursive unlock. */
+    }
+
+    SDL_UnlockMutex(rwlock->lock);
+
+    return 0;
+}
+

external/sdl/SDL/src/thread/generic/SDL_sysrwlock_c.h

@@ -0,0 +1,38 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifndef SDL_sysrwlock_c_h_
+#define SDL_sysrwlock_c_h_
+
+#ifdef SDL_THREAD_GENERIC_RWLOCK_SUFFIX
+
+SDL_RWLock *SDL_CreateRWLock_generic(void);
+void SDL_DestroyRWLock_generic(SDL_RWLock *rwlock);
+int SDL_LockRWLockForReading_generic(SDL_RWLock *rwlock);
+int SDL_LockRWLockForWriting_generic(SDL_RWLock *rwlock);
+int SDL_TryLockRWLockForReading_generic(SDL_RWLock *rwlock);
+int SDL_TryLockRWLockForWriting_generic(SDL_RWLock *rwlock);
+int SDL_UnlockRWLock_generic(SDL_RWLock *rwlock);
+
+#endif /* SDL_THREAD_GENERIC_RWLOCK_SUFFIX */
+
+#endif /* SDL_sysrwlock_c_h_ */

external/sdl/SDL/src/thread/generic/SDL_syssem.c

@@ -0,0 +1,173 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+/* An implementation of semaphores using mutexes and condition variables */
+
+#include "SDL_systhread_c.h"
+
+#ifdef SDL_THREADS_DISABLED
+
+SDL_Semaphore *SDL_CreateSemaphore(Uint32 initial_value)
+{
+    SDL_SetError("SDL not built with thread support");
+    return (SDL_Semaphore *)0;
+}
+
+void SDL_DestroySemaphore(SDL_Semaphore *sem)
+{
+}
+
+int SDL_WaitSemaphoreTimeoutNS(SDL_Semaphore *sem, Sint64 timeoutNS)
+{
+    return SDL_SetError("SDL not built with thread support");
+}
+
+Uint32 SDL_GetSemaphoreValue(SDL_Semaphore *sem)
+{
+    return 0;
+}
+
+int SDL_PostSemaphore(SDL_Semaphore *sem)
+{
+    return SDL_SetError("SDL not built with thread support");
+}
+
+#else
+
+struct SDL_Semaphore
+{
+    Uint32 count;
+    Uint32 waiters_count;
+    SDL_Mutex *count_lock;
+    SDL_Condition *count_nonzero;
+};
+
+SDL_Semaphore *SDL_CreateSemaphore(Uint32 initial_value)
+{
+    SDL_Semaphore *sem;
+
+    sem = (SDL_Semaphore *)SDL_malloc(sizeof(*sem));
+    if (sem == NULL) {
+        SDL_OutOfMemory();
+        return NULL;
+    }
+    sem->count = initial_value;
+    sem->waiters_count = 0;
+
+    sem->count_lock = SDL_CreateMutex();
+    sem->count_nonzero = SDL_CreateCondition();
+    if (!sem->count_lock || !sem->count_nonzero) {
+        SDL_DestroySemaphore(sem);
+        return NULL;
+    }
+
+    return sem;
+}
+
+/* WARNING:
+   You cannot call this function when another thread is using the semaphore.
+*/
+void SDL_DestroySemaphore(SDL_Semaphore *sem)
+{
+    if (sem) {
+        sem->count = 0xFFFFFFFF;
+        while (sem->waiters_count > 0) {
+            SDL_SignalCondition(sem->count_nonzero);
+            SDL_Delay(10);
+        }
+        SDL_DestroyCondition(sem->count_nonzero);
+        if (sem->count_lock) {
+            SDL_LockMutex(sem->count_lock);
+            SDL_UnlockMutex(sem->count_lock);
+            SDL_DestroyMutex(sem->count_lock);
+        }
+        SDL_free(sem);
+    }
+}
+
+int SDL_WaitSemaphoreTimeoutNS(SDL_Semaphore *sem, Sint64 timeoutNS)
+{
+    int retval;
+
+    if (sem == NULL) {
+        return SDL_InvalidParamError("sem");
+    }
+
+    /* A timeout of 0 is an easy case */
+    if (timeoutNS == 0) {
+        retval = SDL_MUTEX_TIMEDOUT;
+        SDL_LockMutex(sem->count_lock);
+        if (sem->count > 0) {
+            --sem->count;
+            retval = 0;
+        }
+        SDL_UnlockMutex(sem->count_lock);
+
+        return retval;
+    }
+
+    SDL_LockMutex(sem->count_lock);
+    ++sem->waiters_count;
+    retval = 0;
+    while ((sem->count == 0) && (retval != SDL_MUTEX_TIMEDOUT)) {
+        retval = SDL_WaitConditionTimeoutNS(sem->count_nonzero,
+                                     sem->count_lock, timeoutNS);
+    }
+    --sem->waiters_count;
+    if (retval == 0) {
+        --sem->count;
+    }
+    SDL_UnlockMutex(sem->count_lock);
+
+    return retval;
+}
+
+Uint32 SDL_GetSemaphoreValue(SDL_Semaphore *sem)
+{
+    Uint32 value;
+
+    value = 0;
+    if (sem) {
+        SDL_LockMutex(sem->count_lock);
+        value = sem->count;
+        SDL_UnlockMutex(sem->count_lock);
+    }
+    return value;
+}
+
+int SDL_PostSemaphore(SDL_Semaphore *sem)
+{
+    if (sem == NULL) {
+        return SDL_InvalidParamError("sem");
+    }
+
+    SDL_LockMutex(sem->count_lock);
+    if (sem->waiters_count > 0) {
+        SDL_SignalCondition(sem->count_nonzero);
+    }
+    ++sem->count;
+    SDL_UnlockMutex(sem->count_lock);
+
+    return 0;
+}
+
+#endif /* SDL_THREADS_DISABLED */

external/sdl/SDL/src/thread/generic/SDL_systhread.c

@@ -0,0 +1,61 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+/* Thread management routines for SDL */
+
+#include "../SDL_systhread.h"
+
+#ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
+int SDL_SYS_CreateThread(SDL_Thread *thread,
+                         pfnSDL_CurrentBeginThread pfnBeginThread,
+                         pfnSDL_CurrentEndThread pfnEndThread)
+#else
+int SDL_SYS_CreateThread(SDL_Thread *thread)
+#endif /* SDL_PASSED_BEGINTHREAD_ENDTHREAD */
+{
+    return SDL_SetError("Threads are not supported on this platform");
+}
+
+void SDL_SYS_SetupThread(const char *name)
+{
+    return;
+}
+
+SDL_threadID SDL_ThreadID(void)
+{
+    return 0;
+}
+
+int SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
+{
+    return 0;
+}
+
+void SDL_SYS_WaitThread(SDL_Thread *thread)
+{
+    return;
+}
+
+void SDL_SYS_DetachThread(SDL_Thread *thread)
+{
+    return;
+}

external/sdl/SDL/src/thread/generic/SDL_systhread_c.h

@@ -0,0 +1,24 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+/* Stub until we implement threads on this platform */
+typedef int SYS_ThreadHandle;

external/sdl/SDL/src/thread/generic/SDL_systls.c

@@ -0,0 +1,33 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include "SDL_internal.h"
+#include "../SDL_thread_c.h"
+
+SDL_TLSData *SDL_SYS_GetTLSData(void)
+{
+    return SDL_Generic_GetTLSData();
+}
+
+int SDL_SYS_SetTLSData(SDL_TLSData *data)
+{
+    return SDL_Generic_SetTLSData(data);
+}

external/sdl/SDL/src/thread/n3ds/SDL_syscond.c

@@ -0,0 +1,118 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_N3DS
+
+/* An implementation of condition variables using libctru's CondVar */
+
+#include "SDL_sysmutex_c.h"
+
+struct SDL_Condition
+{
+    CondVar cond_variable;
+};
+
+/* Create a condition variable */
+SDL_Condition *SDL_CreateCondition(void)
+{
+    SDL_Condition *cond = (SDL_Condition *)SDL_malloc(sizeof(SDL_Condition));
+    if (cond) {
+        CondVar_Init(&cond->cond_variable);
+    } else {
+        SDL_OutOfMemory();
+    }
+    return cond;
+}
+
+/* Destroy a condition variable */
+void SDL_DestroyCondition(SDL_Condition *cond)
+{
+    if (cond) {
+        SDL_free(cond);
+    }
+}
+
+/* Restart one of the threads that are waiting on the condition variable */
+int SDL_SignalCondition(SDL_Condition *cond)
+{
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+
+    CondVar_Signal(&cond->cond_variable);
+    return 0;
+}
+
+/* Restart all threads that are waiting on the condition variable */
+int SDL_BroadcastCondition(SDL_Condition *cond)
+{
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+
+    CondVar_Broadcast(&cond->cond_variable);
+    return 0;
+}
+
+/* Wait on the condition variable for at most 'timeoutNS' nanoseconds.
+   The mutex must be locked before entering this function!
+   The mutex is unlocked during the wait, and locked again after the wait.
+
+Typical use:
+
+Thread A:
+    SDL_LockMutex(lock);
+    while ( ! condition ) {
+        SDL_WaitCondition(cond, lock);
+    }
+    SDL_UnlockMutex(lock);
+
+Thread B:
+    SDL_LockMutex(lock);
+    ...
+    condition = true;
+    ...
+    SDL_SignalCondition(cond);
+    SDL_UnlockMutex(lock);
+ */
+int SDL_WaitConditionTimeoutNS(SDL_Condition *cond, SDL_Mutex *mutex, Sint64 timeoutNS)
+{
+    Result res;
+
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+    if (mutex == NULL) {
+        return SDL_InvalidParamError("mutex");
+    }
+
+    res = 0;
+    if (timeoutNS < 0) {
+        CondVar_Wait(&cond->cond_variable, &mutex->lock.lock);
+    } else {
+        res = CondVar_WaitTimeout(&cond->cond_variable, &mutex->lock.lock, timeoutNS);
+    }
+
+    return R_SUCCEEDED(res) ? 0 : SDL_MUTEX_TIMEDOUT;
+}
+
+#endif /* SDL_THREAD_N3DS */

external/sdl/SDL/src/thread/n3ds/SDL_sysmutex.c

@@ -0,0 +1,86 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_N3DS
+
+/* An implementation of mutexes using libctru's RecursiveLock */
+
+#include "SDL_sysmutex_c.h"
+
+/* Create a mutex */
+SDL_Mutex *SDL_CreateMutex(void)
+{
+    SDL_Mutex *mutex;
+
+    /* Allocate mutex memory */
+    mutex = (SDL_Mutex *)SDL_malloc(sizeof(*mutex));
+    if (mutex) {
+        RecursiveLock_Init(&mutex->lock);
+    } else {
+        SDL_OutOfMemory();
+    }
+    return mutex;
+}
+
+/* Free the mutex */
+void SDL_DestroyMutex(SDL_Mutex *mutex)
+{
+    if (mutex) {
+        SDL_free(mutex);
+    }
+}
+
+/* Lock the mutex */
+int SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    RecursiveLock_Lock(&mutex->lock);
+
+    return 0;
+}
+
+/* try Lock the mutex */
+int SDL_TryLockMutex(SDL_Mutex *mutex)
+{
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    return RecursiveLock_TryLock(&mutex->lock);
+}
+
+/* Unlock the mutex */
+int SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    RecursiveLock_Unlock(&mutex->lock);
+
+    return 0;
+}
+
+#endif /* SDL_THREAD_N3DS */

external/sdl/SDL/src/thread/n3ds/SDL_sysmutex_c.h

@@ -0,0 +1,33 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifndef SDL_sysmutex_c_h_
+#define SDL_sysmutex_c_h_
+
+#include <3ds.h>
+
+struct SDL_Mutex
+{
+    RecursiveLock lock;
+};
+
+#endif /* SDL_sysmutex_c_h */

external/sdl/SDL/src/thread/n3ds/SDL_syssem.c

@@ -0,0 +1,118 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_N3DS
+
+/* An implementation of semaphores using libctru's LightSemaphore */
+
+#include <3ds.h>
+
+int WaitOnSemaphoreFor(SDL_Semaphore *sem, Sint64 timeout);
+
+struct SDL_Semaphore
+{
+    LightSemaphore semaphore;
+};
+
+SDL_Semaphore *SDL_CreateSemaphore(Uint32 initial_value)
+{
+    SDL_Semaphore *sem;
+
+    if (initial_value > SDL_MAX_SINT16) {
+        SDL_SetError("Initial semaphore value too high for this platform");
+        return NULL;
+    }
+
+    sem = (SDL_Semaphore *)SDL_malloc(sizeof(*sem));
+    if (sem == NULL) {
+        SDL_OutOfMemory();
+        return NULL;
+    }
+
+    LightSemaphore_Init(&sem->semaphore, initial_value, SDL_MAX_SINT16);
+
+    return sem;
+}
+
+/* WARNING:
+   You cannot call this function when another thread is using the semaphore.
+*/
+void SDL_DestroySemaphore(SDL_Semaphore *sem)
+{
+    SDL_free(sem);
+}
+
+int SDL_WaitSemaphoreTimeoutNS(SDL_Semaphore *sem, Sint64 timeoutNS)
+{
+    if (sem == NULL) {
+        return SDL_InvalidParamError("sem");
+    }
+
+    if (timeoutNS == SDL_MUTEX_MAXWAIT) {
+        LightSemaphore_Acquire(&sem->semaphore, 1);
+        return 0;
+    }
+
+    if (LightSemaphore_TryAcquire(&sem->semaphore, 1) != 0) {
+        return WaitOnSemaphoreFor(sem, timeoutNS);
+    }
+
+    return 0;
+}
+
+int WaitOnSemaphoreFor(SDL_Semaphore *sem, Sint64 timeout)
+{
+    Uint64 stop_time = SDL_GetTicksNS() + timeout;
+    Uint64 current_time = SDL_GetTicksNS();
+    while (current_time < stop_time) {
+        if (LightSemaphore_TryAcquire(&sem->semaphore, 1) == 0) {
+            return 0;
+        }
+        /* 100 microseconds seems to be the sweet spot */
+        SDL_DelayNS(SDL_US_TO_NS(100));
+        current_time = SDL_GetTicksNS();
+    }
+
+    /* If we failed, yield to avoid starvation on busy waits */
+    SDL_DelayNS(1);
+    return SDL_MUTEX_TIMEDOUT;
+}
+
+Uint32 SDL_GetSemaphoreValue(SDL_Semaphore *sem)
+{
+    if (sem == NULL) {
+        SDL_InvalidParamError("sem");
+        return 0;
+    }
+    return sem->semaphore.current_count;
+}
+
+int SDL_PostSemaphore(SDL_Semaphore *sem)
+{
+    if (sem == NULL) {
+        return SDL_InvalidParamError("sem");
+    }
+    LightSemaphore_Release(&sem->semaphore, 1);
+    return 0;
+}
+
+#endif /* SDL_THREAD_N3DS */

external/sdl/SDL/src/thread/n3ds/SDL_systhread.c

@@ -0,0 +1,139 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_N3DS
+
+/* Thread management routines for SDL */
+
+#include "../SDL_systhread.h"
+
+/* N3DS has very limited RAM (128MB), so we put a limit on thread stack size. */
+#define N3DS_THREAD_STACK_SIZE_MAX     (16 * 1024)
+#define N3DS_THREAD_STACK_SIZE_DEFAULT (4 * 1024)
+
+#define N3DS_THREAD_PRIORITY_LOW           0x3F /**< Minimum priority */
+#define N3DS_THREAD_PRIORITY_MEDIUM        0x2F /**< Slightly higher than main thread (0x30) */
+#define N3DS_THREAD_PRIORITY_HIGH          0x19 /**< High priority for non-video work */
+#define N3DS_THREAD_PRIORITY_TIME_CRITICAL 0x18 /**< Highest priority */
+
+static size_t GetStackSize(size_t requested_size);
+
+static void ThreadEntry(void *arg)
+{
+    SDL_RunThread((SDL_Thread *)arg);
+    threadExit(0);
+}
+
+#ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
+#error "SDL_PASSED_BEGINTHREAD_ENDTHREAD is not supported on N3DS"
+#endif
+
+int SDL_SYS_CreateThread(SDL_Thread *thread)
+{
+    s32 priority;
+    size_t stack_size = GetStackSize(thread->stacksize);
+    svcGetThreadPriority(&priority, CUR_THREAD_HANDLE);
+
+    thread->handle = threadCreate(ThreadEntry,
+                                  thread,
+                                  stack_size,
+                                  priority,
+                                  -1,
+                                  false);
+
+    if (thread->handle == NULL) {
+        return SDL_SetError("Couldn't create thread");
+    }
+
+    return 0;
+}
+
+static size_t GetStackSize(size_t requested_size)
+{
+    if (requested_size == 0) {
+        return N3DS_THREAD_STACK_SIZE_DEFAULT;
+    }
+
+    if (requested_size > N3DS_THREAD_STACK_SIZE_MAX) {
+        SDL_LogWarn(SDL_LOG_CATEGORY_SYSTEM,
+                    "Requested a thread size of %zu,"
+                    " falling back to the maximum supported of %zu\n",
+                    requested_size,
+                    N3DS_THREAD_STACK_SIZE_MAX);
+        requested_size = N3DS_THREAD_STACK_SIZE_MAX;
+    }
+    return requested_size;
+}
+
+void SDL_SYS_SetupThread(const char *name)
+{
+    return;
+}
+
+SDL_threadID SDL_ThreadID(void)
+{
+    u32 thread_ID = 0;
+    svcGetThreadId(&thread_ID, CUR_THREAD_HANDLE);
+    return (SDL_threadID)thread_ID;
+}
+
+int SDL_SYS_SetThreadPriority(SDL_ThreadPriority sdl_priority)
+{
+    s32 svc_priority;
+    switch (sdl_priority) {
+    case SDL_THREAD_PRIORITY_LOW:
+        svc_priority = N3DS_THREAD_PRIORITY_LOW;
+        break;
+    case SDL_THREAD_PRIORITY_NORMAL:
+        svc_priority = N3DS_THREAD_PRIORITY_MEDIUM;
+        break;
+    case SDL_THREAD_PRIORITY_HIGH:
+        svc_priority = N3DS_THREAD_PRIORITY_HIGH;
+        break;
+    case SDL_THREAD_PRIORITY_TIME_CRITICAL:
+        svc_priority = N3DS_THREAD_PRIORITY_TIME_CRITICAL;
+        break;
+    default:
+        svc_priority = N3DS_THREAD_PRIORITY_MEDIUM;
+    }
+    return (int)svcSetThreadPriority(CUR_THREAD_HANDLE, svc_priority);
+}
+
+void SDL_SYS_WaitThread(SDL_Thread *thread)
+{
+    Result res = threadJoin(thread->handle, U64_MAX);
+
+    /*
+      Detached threads can be waited on, but should NOT be cleaned manually
+      as it would result in a fatal error.
+    */
+    if (R_SUCCEEDED(res) && SDL_AtomicGet(&thread->state) != SDL_THREAD_STATE_DETACHED) {
+        threadFree(thread->handle);
+    }
+}
+
+void SDL_SYS_DetachThread(SDL_Thread *thread)
+{
+    threadDetach(thread->handle);
+}
+
+#endif /* SDL_THREAD_N3DS */

external/sdl/SDL/src/thread/n3ds/SDL_systhread_c.h

@@ -0,0 +1,30 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifndef SDL_systhread_c_h_
+#define SDL_systhread_c_h_
+
+#include <3ds.h>
+
+typedef Thread SYS_ThreadHandle;
+
+#endif /* SDL_systhread_c_h_ */

external/sdl/SDL/src/thread/ngage/SDL_sysmutex.cpp

@@ -0,0 +1,110 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+/* An implementation of mutexes using the Symbian API. */
+
+#include <e32std.h>
+
+#include "SDL_systhread_c.h"
+
+struct SDL_Mutex
+{
+    TInt handle;
+};
+
+extern TInt CreateUnique(TInt (*aFunc)(const TDesC &aName, TAny *, TAny *), TAny *, TAny *);
+
+static TInt NewMutex(const TDesC &aName, TAny *aPtr1, TAny *)
+{
+    return ((RMutex *)aPtr1)->CreateGlobal(aName);
+}
+
+/* Create a mutex */
+SDL_Mutex *SDL_CreateMutex(void)
+{
+    RMutex rmutex;
+
+    TInt status = CreateUnique(NewMutex, &rmutex, NULL);
+    if (status != KErrNone) {
+        SDL_SetError("Couldn't create mutex.");
+        return NULL;
+    }
+    SDL_Mutex *mutex = new /*(ELeave)*/ SDL_Mutex;
+    mutex->handle = rmutex.Handle();
+    return mutex;
+}
+
+/* Free the mutex */
+void SDL_DestroyMutex(SDL_Mutex *mutex)
+{
+    if (mutex) {
+        RMutex rmutex;
+        rmutex.SetHandle(mutex->handle);
+        rmutex.Signal();
+        rmutex.Close();
+        delete (mutex);
+        mutex = NULL;
+    }
+}
+
+/* Lock the mutex */
+int SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    RMutex rmutex;
+    rmutex.SetHandle(mutex->handle);
+    rmutex.Wait();
+
+    return 0;
+}
+
+/* Try to lock the mutex */
+#if 0
+int SDL_TryLockMutex(SDL_Mutex *mutex)
+{
+    if (mutex == NULL)
+    {
+        return 0;
+    }
+
+    // Not yet implemented.
+    return 0;
+}
+#endif
+
+/* Unlock the mutex */
+int SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    RMutex rmutex;
+    rmutex.SetHandle(mutex->handle);
+    rmutex.Signal();
+
+    return 0;
+}
+

external/sdl/SDL/src/thread/ngage/SDL_syssem.cpp

@@ -0,0 +1,160 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+/* An implementation of semaphores using the Symbian API. */
+
+#include <e32std.h>
+
+/* !!! FIXME: Should this be SDL_MUTEX_TIMEDOUT? */
+#define SDL_MUTEX_TIMEOUT -2
+
+struct SDL_Semaphore
+{
+    TInt handle;
+    TInt count;
+};
+
+struct TInfo
+{
+    TInfo(TInt aTime, TInt aHandle) : iTime(aTime), iHandle(aHandle), iVal(0) {}
+    TInt iTime;
+    TInt iHandle;
+    TInt iVal;
+};
+
+extern TInt CreateUnique(TInt (*aFunc)(const TDesC &aName, TAny *, TAny *), TAny *, TAny *);
+
+static TBool RunThread(TAny *aInfo)
+{
+    TInfo *info = STATIC_CAST(TInfo *, aInfo);
+    User::After(info->iTime);
+    RSemaphore sema;
+    sema.SetHandle(info->iHandle);
+    sema.Signal();
+    info->iVal = SDL_MUTEX_TIMEOUT;
+    return 0;
+}
+
+static TInt NewThread(const TDesC &aName, TAny *aPtr1, TAny *aPtr2)
+{
+    return ((RThread *)(aPtr1))->Create(aName, RunThread, KDefaultStackSize, NULL, aPtr2);
+}
+
+static TInt NewSema(const TDesC &aName, TAny *aPtr1, TAny *aPtr2)
+{
+    TInt value = *((TInt *)aPtr2);
+    return ((RSemaphore *)aPtr1)->CreateGlobal(aName, value);
+}
+
+static void WaitAll(SDL_Semaphore *sem)
+{
+    RSemaphore sema;
+    sema.SetHandle(sem->handle);
+    sema.Wait();
+    while (sem->count < 0) {
+        sema.Wait();
+    }
+}
+
+SDL_Semaphore *SDL_CreateSemaphore(Uint32 initial_value)
+{
+    RSemaphore s;
+    TInt status = CreateUnique(NewSema, &s, &initial_value);
+    if (status != KErrNone) {
+        SDL_SetError("Couldn't create semaphore");
+    }
+    SDL_Semaphore *sem = new /*(ELeave)*/ SDL_Semaphore;
+    sem->handle = s.Handle();
+    sem->count = initial_value;
+    return sem;
+}
+
+void SDL_DestroySemaphore(SDL_Semaphore *sem)
+{
+    if (sem != NULL) {
+        RSemaphore sema;
+        sema.SetHandle(sem->handle);
+        sema.Signal(sema.Count());
+        sema.Close();
+        delete sem;
+        sem = NULL;
+    }
+}
+
+int SDL_WaitSemaphoreTimeoutNS(SDL_Semaphore *sem, Sint64 timeoutNS)
+{
+    if (sem == NULL) {
+        return SDL_InvalidParamError("sem");
+    }
+
+    if (timeoutNS == 0) {
+        if (sem->count > 0) {
+            --sem->count;
+            return 0;
+        }
+        return SDL_MUTEX_TIMEOUT;
+    }
+
+    if (timeoutNS == SDL_MUTEX_MAXWAIT) {
+        WaitAll(sem);
+        return 0;
+    }
+
+    RThread thread;
+    TInfo *info = new (ELeave) TInfo((TInt)SDL_NS_TO_MS(timeoutNS), sem->handle);
+    TInt status = CreateUnique(NewThread, &thread, info);
+
+    if (status != KErrNone) {
+        return status;
+    }
+
+    thread.Resume();
+    WaitAll(sem);
+
+    if (thread.ExitType() == EExitPending) {
+        thread.Kill(SDL_MUTEX_TIMEOUT);
+    }
+
+    thread.Close();
+    return info->iVal;
+}
+
+Uint32 SDL_GetSemaphoreValue(SDL_Semaphore *sem)
+{
+    if (sem == NULL) {
+        SDL_InvalidParamError("sem");
+        return 0;
+    }
+    return sem->count;
+}
+
+int SDL_PostSemaphore(SDL_Semaphore *sem)
+{
+    if (sem == NULL) {
+        return SDL_InvalidParamError("sem");
+    }
+    sem->count++;
+    RSemaphore sema;
+    sema.SetHandle(sem->handle);
+    sema.Signal();
+    return 0;
+}

external/sdl/SDL/src/thread/ngage/SDL_systhread.cpp

@@ -0,0 +1,110 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_NGAGE
+
+/* N-Gage thread management routines for SDL */
+
+#include <e32std.h>
+
+extern "C" {
+#undef NULL
+#include "../SDL_systhread.h"
+#include "../SDL_thread_c.h"
+};
+
+static int object_count;
+
+static int RunThread(TAny *data)
+{
+    SDL_RunThread((SDL_Thread *)data);
+    return 0;
+}
+
+static TInt NewThread(const TDesC &aName, TAny *aPtr1, TAny *aPtr2)
+{
+    return ((RThread *)(aPtr1))->Create(aName, RunThread, KDefaultStackSize, NULL, aPtr2);
+}
+
+int CreateUnique(TInt (*aFunc)(const TDesC &aName, TAny *, TAny *), TAny *aPtr1, TAny *aPtr2)
+{
+    TBuf<16> name;
+    TInt status = KErrNone;
+    do {
+        object_count++;
+        name.Format(_L("SDL_%x"), object_count);
+        status = aFunc(name, aPtr1, aPtr2);
+    } while (status == KErrAlreadyExists);
+    return status;
+}
+
+int SDL_SYS_CreateThread(SDL_Thread *thread)
+{
+    RThread rthread;
+
+    TInt status = CreateUnique(NewThread, &rthread, thread);
+    if (status != KErrNone) {
+        delete (RThread *)thread->handle;
+        thread->handle = NULL;
+        return SDL_SetError("Not enough resources to create thread");
+    }
+
+    rthread.Resume();
+    thread->handle = rthread.Handle();
+    return 0;
+}
+
+void SDL_SYS_SetupThread(const char *name)
+{
+    return;
+}
+
+SDL_threadID SDL_ThreadID(void)
+{
+    RThread current;
+    TThreadId id = current.Id();
+    return id;
+}
+
+int SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
+{
+    return 0;
+}
+
+void SDL_SYS_WaitThread(SDL_Thread *thread)
+{
+    RThread t;
+    t.Open(thread->threadid);
+    if (t.ExitReason() == EExitPending) {
+        TRequestStatus status;
+        t.Logon(status);
+        User::WaitForRequest(status);
+    }
+    t.Close();
+}
+
+void SDL_SYS_DetachThread(SDL_Thread *thread)
+{
+    return;
+}
+
+#endif /* SDL_THREAD_NGAGE */

external/sdl/SDL/src/thread/ngage/SDL_systhread_c.h

@@ -0,0 +1,23 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+typedef int SYS_ThreadHandle;

external/sdl/SDL/src/thread/ps2/SDL_syssem.c

@@ -0,0 +1,145 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_PS2
+
+/* Semaphore functions for the PS2. */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <timer_alarm.h>
+
+#include <kernel.h>
+
+struct SDL_Semaphore
+{
+    s32 semid;
+};
+
+static void usercb(struct timer_alarm_t *alarm, void *arg)
+{
+    iReleaseWaitThread((int)arg);
+}
+
+/* Create a semaphore */
+SDL_Semaphore *SDL_CreateSemaphore(Uint32 initial_value)
+{
+    SDL_Semaphore *sem;
+    ee_sema_t sema;
+
+    sem = (SDL_Semaphore *)SDL_malloc(sizeof(*sem));
+    if (sem != NULL) {
+        /* TODO: Figure out the limit on the maximum value. */
+        sema.init_count = initial_value;
+        sema.max_count = 255;
+        sema.option = 0;
+        sem->semid = CreateSema(&sema);
+
+        if (sem->semid < 0) {
+            SDL_SetError("Couldn't create semaphore");
+            SDL_free(sem);
+            sem = NULL;
+        }
+    } else {
+        SDL_OutOfMemory();
+    }
+
+    return sem;
+}
+
+/* Free the semaphore */
+void SDL_DestroySemaphore(SDL_Semaphore *sem)
+{
+    if (sem != NULL) {
+        if (sem->semid > 0) {
+            DeleteSema(sem->semid);
+            sem->semid = 0;
+        }
+
+        SDL_free(sem);
+    }
+}
+
+int SDL_WaitSemaphoreTimeoutNS(SDL_Semaphore *sem, Sint64 timeoutNS)
+{
+    int ret;
+    struct timer_alarm_t alarm;
+    InitializeTimerAlarm(&alarm);
+
+    if (sem == NULL) {
+        return SDL_InvalidParamError("sem");
+    }
+
+    if (timeoutNS == 0) {
+        if (PollSema(sem->semid) < 0) {
+            return SDL_MUTEX_TIMEDOUT;
+        }
+        return 0;
+    }
+
+    if (timeoutNS != SDL_MUTEX_MAXWAIT) {
+        SetTimerAlarm(&alarm, MSec2TimerBusClock(SDL_NS_TO_MS(timeoutNS)), &usercb, (void *)GetThreadId());
+    }
+
+    ret = WaitSema(sem->semid);
+    StopTimerAlarm(&alarm);
+
+    if (ret < 0) {
+        return SDL_MUTEX_TIMEDOUT;
+    }
+    return 0; // Wait condition satisfied.
+}
+
+/* Returns the current count of the semaphore */
+Uint32 SDL_GetSemaphoreValue(SDL_Semaphore *sem)
+{
+    ee_sema_t info;
+
+    if (sem == NULL) {
+        SDL_InvalidParamError("sem");
+        return 0;
+    }
+
+    if (ReferSemaStatus(sem->semid, &info) >= 0) {
+        return info.count;
+    }
+
+    return 0;
+}
+
+int SDL_PostSemaphore(SDL_Semaphore *sem)
+{
+    int res;
+
+    if (sem == NULL) {
+        return SDL_InvalidParamError("sem");
+    }
+
+    res = SignalSema(sem->semid);
+    if (res < 0) {
+        return SDL_SetError("sceKernelSignalSema() failed");
+    }
+
+    return 0;
+}
+
+#endif /* SDL_THREAD_PS2 */

external/sdl/SDL/src/thread/ps2/SDL_systhread.c

@@ -0,0 +1,135 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_PS2
+
+/* PS2 thread management routines for SDL */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "../SDL_systhread.h"
+#include "../SDL_thread_c.h"
+#include <kernel.h>
+
+static void FinishThread(SDL_Thread *thread)
+{
+    ee_thread_status_t info;
+    int res;
+
+    res = ReferThreadStatus(thread->handle, &info);
+    TerminateThread(thread->handle);
+    DeleteThread(thread->handle);
+    DeleteSema((int)thread->endfunc);
+
+    if (res > 0) {
+        SDL_free(info.stack);
+    }
+}
+
+static int childThread(void *arg)
+{
+    SDL_Thread *thread = (SDL_Thread *)arg;
+    int res = thread->userfunc(thread->userdata);
+    SignalSema((int)thread->endfunc);
+    return res;
+}
+
+int SDL_SYS_CreateThread(SDL_Thread *thread)
+{
+    ee_thread_status_t status;
+    ee_thread_t eethread;
+    ee_sema_t sema;
+    size_t stack_size;
+    int priority = 32;
+
+    /* Set priority of new thread to the same as the current thread */
+    // status.size = sizeof(ee_thread_t);
+    if (ReferThreadStatus(GetThreadId(), &status) == 0) {
+        priority = status.current_priority;
+    }
+
+    stack_size = thread->stacksize ? ((int)thread->stacksize) : 0x1800;
+
+    /* Create EE Thread */
+    eethread.attr = 0;
+    eethread.option = 0;
+    eethread.func = &childThread;
+    eethread.stack = SDL_malloc(stack_size);
+    eethread.stack_size = stack_size;
+    eethread.gp_reg = &_gp;
+    eethread.initial_priority = priority;
+    thread->handle = CreateThread(&eethread);
+
+    if (thread->handle < 0) {
+        return SDL_SetError("CreateThread() failed");
+    }
+
+    // Prepare el semaphore for the ending function
+    sema.init_count = 0;
+    sema.max_count = 1;
+    sema.option = 0;
+    thread->endfunc = (void *)CreateSema(&sema);
+
+    return StartThread(thread->handle, thread);
+}
+
+void SDL_SYS_SetupThread(const char *name)
+{
+    /* Do nothing. */
+}
+
+SDL_threadID SDL_ThreadID(void)
+{
+    return (SDL_threadID)GetThreadId();
+}
+
+void SDL_SYS_WaitThread(SDL_Thread *thread)
+{
+    WaitSema((int)thread->endfunc);
+    ReleaseWaitThread(thread->handle);
+    FinishThread(thread);
+}
+
+void SDL_SYS_DetachThread(SDL_Thread *thread)
+{
+    /* Do nothing. */
+}
+
+int SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
+{
+    int value;
+
+    if (priority == SDL_THREAD_PRIORITY_LOW) {
+        value = 111;
+    } else if (priority == SDL_THREAD_PRIORITY_HIGH) {
+        value = 32;
+    } else if (priority == SDL_THREAD_PRIORITY_TIME_CRITICAL) {
+        value = 16;
+    } else {
+        value = 50;
+    }
+
+    return ChangeThreadPriority(GetThreadId(), value);
+}
+
+#endif /* SDL_THREAD_PS2 */

external/sdl/SDL/src/thread/ps2/SDL_systhread_c.h

@@ -0,0 +1,24 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include <stdint.h>
+
+typedef int32_t SYS_ThreadHandle;

external/sdl/SDL/src/thread/psp/SDL_syscond.c

@@ -0,0 +1,204 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_PSP
+
+/* An implementation of condition variables using semaphores and mutexes */
+/*
+   This implementation borrows heavily from the BeOS condition variable
+   implementation, written by Christopher Tate and Owen Smith.  Thanks!
+ */
+
+struct SDL_Condition
+{
+    SDL_Mutex *lock;
+    int waiting;
+    int signals;
+    SDL_Semaphore *wait_sem;
+    SDL_Semaphore *wait_done;
+};
+
+/* Create a condition variable */
+SDL_Condition *SDL_CreateCondition(void)
+{
+    SDL_Condition *cond;
+
+    cond = (SDL_Condition *)SDL_malloc(sizeof(SDL_Condition));
+    if (cond) {
+        cond->lock = SDL_CreateMutex();
+        cond->wait_sem = SDL_CreateSemaphore(0);
+        cond->wait_done = SDL_CreateSemaphore(0);
+        cond->waiting = cond->signals = 0;
+        if (!cond->lock || !cond->wait_sem || !cond->wait_done) {
+            SDL_DestroyCondition(cond);
+            cond = NULL;
+        }
+    } else {
+        SDL_OutOfMemory();
+    }
+    return cond;
+}
+
+/* Destroy a condition variable */
+void SDL_DestroyCondition(SDL_Condition *cond)
+{
+    if (cond) {
+        if (cond->wait_sem) {
+            SDL_DestroySemaphore(cond->wait_sem);
+        }
+        if (cond->wait_done) {
+            SDL_DestroySemaphore(cond->wait_done);
+        }
+        if (cond->lock) {
+            SDL_DestroyMutex(cond->lock);
+        }
+        SDL_free(cond);
+    }
+}
+
+/* Restart one of the threads that are waiting on the condition variable */
+int SDL_SignalCondition(SDL_Condition *cond)
+{
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+
+    /* If there are waiting threads not already signalled, then
+       signal the condition and wait for the thread to respond.
+     */
+    SDL_LockMutex(cond->lock);
+    if (cond->waiting > cond->signals) {
+        ++cond->signals;
+        SDL_PostSemaphore(cond->wait_sem);
+        SDL_UnlockMutex(cond->lock);
+        SDL_WaitSemaphore(cond->wait_done);
+    } else {
+        SDL_UnlockMutex(cond->lock);
+    }
+
+    return 0;
+}
+
+/* Restart all threads that are waiting on the condition variable */
+int SDL_BroadcastCondition(SDL_Condition *cond)
+{
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+
+    /* If there are waiting threads not already signalled, then
+       signal the condition and wait for the thread to respond.
+     */
+    SDL_LockMutex(cond->lock);
+    if (cond->waiting > cond->signals) {
+        int i, num_waiting;
+
+        num_waiting = (cond->waiting - cond->signals);
+        cond->signals = cond->waiting;
+        for (i = 0; i < num_waiting; ++i) {
+            SDL_PostSemaphore(cond->wait_sem);
+        }
+        /* Now all released threads are blocked here, waiting for us.
+           Collect them all (and win fabulous prizes!) :-)
+         */
+        SDL_UnlockMutex(cond->lock);
+        for (i = 0; i < num_waiting; ++i) {
+            SDL_WaitSemaphore(cond->wait_done);
+        }
+    } else {
+        SDL_UnlockMutex(cond->lock);
+    }
+
+    return 0;
+}
+
+/* Wait on the condition variable for at most 'timeoutNS' nanoseconds.
+   The mutex must be locked before entering this function!
+   The mutex is unlocked during the wait, and locked again after the wait.
+
+Typical use:
+
+Thread A:
+    SDL_LockMutex(lock);
+    while ( ! condition ) {
+        SDL_WaitCondition(cond, lock);
+    }
+    SDL_UnlockMutex(lock);
+
+Thread B:
+    SDL_LockMutex(lock);
+    ...
+    condition = true;
+    ...
+    SDL_SignalCondition(cond);
+    SDL_UnlockMutex(lock);
+ */
+int SDL_WaitConditionTimeoutNS(SDL_Condition *cond, SDL_Mutex *mutex, Sint64 timeoutNS)
+{
+    int retval;
+
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+
+    /* Obtain the protection mutex, and increment the number of waiters.
+       This allows the signal mechanism to only perform a signal if there
+       are waiting threads.
+     */
+    SDL_LockMutex(cond->lock);
+    ++cond->waiting;
+    SDL_UnlockMutex(cond->lock);
+
+    /* Unlock the mutex, as is required by condition variable semantics */
+    SDL_UnlockMutex(mutex);
+
+    /* Wait for a signal */
+    retval = SDL_WaitSemaphoreTimeout(cond->wait_sem, timeoutNS);
+
+    /* Let the signaler know we have completed the wait, otherwise
+       the signaler can race ahead and get the condition semaphore
+       if we are stopped between the mutex unlock and semaphore wait,
+       giving a deadlock.  See the following URL for details:
+       http://www-classic.be.com/aboutbe/benewsletter/volume_III/Issue40.html
+     */
+    SDL_LockMutex(cond->lock);
+    if (cond->signals > 0) {
+        /* If we timed out, we need to eat a condition signal */
+        if (retval > 0) {
+            SDL_WaitSemaphore(cond->wait_sem);
+        }
+        /* We always notify the signal thread that we are done */
+        SDL_PostSemaphore(cond->wait_done);
+
+        /* Signal handshake complete */
+        --cond->signals;
+    }
+    --cond->waiting;
+    SDL_UnlockMutex(cond->lock);
+
+    /* Lock the mutex, as is required by condition variable semantics */
+    SDL_LockMutex(mutex);
+
+    return retval;
+}
+
+#endif /* SDL_THREAD_PSP */

external/sdl/SDL/src/thread/psp/SDL_sysmutex.c

@@ -0,0 +1,145 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_PSP
+
+/* An implementation of mutexes using semaphores */
+
+#include "SDL_systhread_c.h"
+
+#include <pspthreadman.h>
+#include <pspkerror.h>
+
+#define SCE_KERNEL_MUTEX_ATTR_RECURSIVE 0x0200U
+
+struct SDL_Mutex
+{
+    SceLwMutexWorkarea lock;
+};
+
+/* Create a mutex */
+SDL_Mutex *SDL_CreateMutex(void)
+{
+    SDL_Mutex *mutex = NULL;
+    SceInt32 res = 0;
+
+    /* Allocate mutex memory */
+    mutex = (SDL_Mutex *)SDL_malloc(sizeof(*mutex));
+    if (mutex) {
+
+        res = sceKernelCreateLwMutex(
+            &mutex->lock,
+            "SDL mutex",
+            SCE_KERNEL_MUTEX_ATTR_RECURSIVE,
+            0,
+            NULL);
+
+        if (res < 0) {
+            SDL_SetError("Error trying to create mutex: %lx", res);
+        }
+    } else {
+        SDL_OutOfMemory();
+    }
+    return mutex;
+}
+
+/* Free the mutex */
+void SDL_DestroyMutex(SDL_Mutex *mutex)
+{
+    if (mutex) {
+        sceKernelDeleteLwMutex(&mutex->lock);
+        SDL_free(mutex);
+    }
+}
+
+/* Lock the mutex */
+int SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+#ifdef SDL_THREADS_DISABLED
+    return 0;
+#else
+    SceInt32 res = 0;
+
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    res = sceKernelLockLwMutex(&mutex->lock, 1, NULL);
+    if (res != SCE_KERNEL_ERROR_OK) {
+        return SDL_SetError("Error trying to lock mutex: %lx", res);
+    }
+
+    return 0;
+#endif /* SDL_THREADS_DISABLED */
+}
+
+/* Try to lock the mutex */
+int SDL_TryLockMutex(SDL_Mutex *mutex)
+{
+#ifdef SDL_THREADS_DISABLED
+    return 0;
+#else
+    SceInt32 res = 0;
+
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    res = sceKernelTryLockLwMutex(&mutex->lock, 1);
+    switch (res) {
+    case SCE_KERNEL_ERROR_OK:
+        return 0;
+        break;
+    case SCE_KERNEL_ERROR_WAIT_TIMEOUT:
+        return SDL_MUTEX_TIMEDOUT;
+        break;
+    default:
+        return SDL_SetError("Error trying to lock mutex: %lx", res);
+        break;
+    }
+
+    return -1;
+#endif /* SDL_THREADS_DISABLED */
+}
+
+/* Unlock the mutex */
+int SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+#ifdef SDL_THREADS_DISABLED
+    return 0;
+#else
+    SceInt32 res = 0;
+
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    res = sceKernelUnlockLwMutex(&mutex->lock, 1);
+    if (res != 0) {
+        return SDL_SetError("Error trying to unlock mutex: %lx", res);
+    }
+
+    return 0;
+#endif /* SDL_THREADS_DISABLED */
+}
+
+#endif /* SDL_THREAD_PSP */

external/sdl/SDL/src/thread/psp/SDL_sysmutex_c.h

@@ -0,0 +1,21 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"

external/sdl/SDL/src/thread/psp/SDL_syssem.c

@@ -0,0 +1,145 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_PSP
+
+/* Semaphore functions for the PSP. */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <pspthreadman.h>
+#include <pspkerror.h>
+
+struct SDL_Semaphore
+{
+    SceUID semid;
+};
+
+/* Create a semaphore */
+SDL_Semaphore *SDL_CreateSemaphore(Uint32 initial_value)
+{
+    SDL_Semaphore *sem;
+
+    sem = (SDL_Semaphore *)SDL_malloc(sizeof(*sem));
+    if (sem != NULL) {
+        /* TODO: Figure out the limit on the maximum value. */
+        sem->semid = sceKernelCreateSema("SDL sema", 0, initial_value, 255, NULL);
+        if (sem->semid < 0) {
+            SDL_SetError("Couldn't create semaphore");
+            SDL_free(sem);
+            sem = NULL;
+        }
+    } else {
+        SDL_OutOfMemory();
+    }
+
+    return sem;
+}
+
+/* Free the semaphore */
+void SDL_DestroySemaphore(SDL_Semaphore *sem)
+{
+    if (sem != NULL) {
+        if (sem->semid > 0) {
+            sceKernelDeleteSema(sem->semid);
+            sem->semid = 0;
+        }
+
+        SDL_free(sem);
+    }
+}
+
+/* TODO: This routine is a bit overloaded.
+ * If the timeout is 0 then just poll the semaphore; if it's SDL_MUTEX_MAXWAIT, pass
+ * NULL to sceKernelWaitSema() so that it waits indefinitely; and if the timeout
+ * is specified, convert it to microseconds. */
+int SDL_WaitSemaphoreTimeoutNS(SDL_Semaphore *sem, Sint64 timeoutNS)
+{
+	SceUInt timeoutUS;
+    SceUInt *pTimeout;
+    int res;
+
+    if (sem == NULL) {
+        return SDL_InvalidParamError("sem");
+    }
+
+    if (timeoutNS == 0) {
+        res = sceKernelPollSema(sem->semid, 1);
+        if (res < 0) {
+            return SDL_MUTEX_TIMEDOUT;
+        }
+        return 0;
+    }
+
+    if (timeoutNS < 0) {
+        pTimeout = NULL;
+    } else {
+        timeoutUS = (SceUInt)SDL_NS_TO_US(timeoutNS); /* Convert to microseconds. */
+        pTimeout = &timeoutUS;
+    }
+
+    res = sceKernelWaitSema(sem->semid, 1, pTimeout);
+    switch (res) {
+    case SCE_KERNEL_ERROR_OK:
+        return 0;
+    case SCE_KERNEL_ERROR_WAIT_TIMEOUT:
+        return SDL_MUTEX_TIMEDOUT;
+    default:
+        return SDL_SetError("sceKernelWaitSema() failed");
+    }
+}
+
+/* Returns the current count of the semaphore */
+Uint32 SDL_GetSemaphoreValue(SDL_Semaphore *sem)
+{
+    SceKernelSemaInfo info;
+
+    if (sem == NULL) {
+        SDL_InvalidParamError("sem");
+        return 0;
+    }
+
+    if (sceKernelReferSemaStatus(sem->semid, &info) >= 0) {
+        return info.currentCount;
+    }
+
+    return 0;
+}
+
+int SDL_PostSemaphore(SDL_Semaphore *sem)
+{
+    int res;
+
+    if (sem == NULL) {
+        return SDL_InvalidParamError("sem");
+    }
+
+    res = sceKernelSignalSema(sem->semid, 1);
+    if (res < 0) {
+        return SDL_SetError("sceKernelSignalSema() failed");
+    }
+
+    return 0;
+}
+
+#endif /* SDL_THREAD_PSP */

external/sdl/SDL/src/thread/psp/SDL_systhread.c

@@ -0,0 +1,107 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_PSP
+
+/* PSP thread management routines for SDL */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "../SDL_systhread.h"
+#include "../SDL_thread_c.h"
+#include <pspkerneltypes.h>
+#include <pspthreadman.h>
+
+static int ThreadEntry(SceSize args, void *argp)
+{
+    SDL_RunThread(*(SDL_Thread **)argp);
+    return 0;
+}
+
+int SDL_SYS_CreateThread(SDL_Thread *thread)
+{
+    SceKernelThreadInfo status;
+    int priority = 32;
+
+    /* Set priority of new thread to the same as the current thread */
+    status.size = sizeof(SceKernelThreadInfo);
+    if (sceKernelReferThreadStatus(sceKernelGetThreadId(), &status) == 0) {
+        priority = status.currentPriority;
+    }
+
+    thread->handle = sceKernelCreateThread(thread->name, ThreadEntry,
+                                           priority, thread->stacksize ? ((int)thread->stacksize) : 0x8000,
+                                           PSP_THREAD_ATTR_VFPU, NULL);
+    if (thread->handle < 0) {
+        return SDL_SetError("sceKernelCreateThread() failed");
+    }
+
+    sceKernelStartThread(thread->handle, 4, &thread);
+    return 0;
+}
+
+void SDL_SYS_SetupThread(const char *name)
+{
+    /* Do nothing. */
+}
+
+SDL_threadID SDL_ThreadID(void)
+{
+    return (SDL_threadID)sceKernelGetThreadId();
+}
+
+void SDL_SYS_WaitThread(SDL_Thread *thread)
+{
+    sceKernelWaitThreadEnd(thread->handle, NULL);
+    sceKernelDeleteThread(thread->handle);
+}
+
+void SDL_SYS_DetachThread(SDL_Thread *thread)
+{
+    /* !!! FIXME: is this correct? */
+    sceKernelDeleteThread(thread->handle);
+}
+
+void SDL_SYS_KillThread(SDL_Thread *thread)
+{
+    sceKernelTerminateDeleteThread(thread->handle);
+}
+
+int SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
+{
+    int value;
+
+    if (priority == SDL_THREAD_PRIORITY_LOW) {
+        value = 111;
+    } else if (priority == SDL_THREAD_PRIORITY_HIGH) {
+        value = 32;
+    } else if (priority == SDL_THREAD_PRIORITY_TIME_CRITICAL) {
+        value = 16;
+    } else {
+        value = 50;
+    }
+
+    return sceKernelChangeThreadPriority(sceKernelGetThreadId(), value);
+}
+
+#endif /* SDL_THREAD_PSP */

external/sdl/SDL/src/thread/psp/SDL_systhread_c.h

@@ -0,0 +1,24 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include <pspkerneltypes.h>
+
+typedef SceUID SYS_ThreadHandle;

external/sdl/SDL/src/thread/pthread/SDL_syscond.c

@@ -0,0 +1,143 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#include <sys/time.h>
+#include <time.h>
+#include <unistd.h>
+#include <errno.h>
+#include <pthread.h>
+
+#include "SDL_sysmutex_c.h"
+
+struct SDL_Condition
+{
+    pthread_cond_t cond;
+};
+
+/* Create a condition variable */
+SDL_Condition *SDL_CreateCondition(void)
+{
+    SDL_Condition *cond;
+
+    cond = (SDL_Condition *)SDL_malloc(sizeof(SDL_Condition));
+    if (cond) {
+        if (pthread_cond_init(&cond->cond, NULL) != 0) {
+            SDL_SetError("pthread_cond_init() failed");
+            SDL_free(cond);
+            cond = NULL;
+        }
+    }
+    return cond;
+}
+
+/* Destroy a condition variable */
+void SDL_DestroyCondition(SDL_Condition *cond)
+{
+    if (cond) {
+        pthread_cond_destroy(&cond->cond);
+        SDL_free(cond);
+    }
+}
+
+/* Restart one of the threads that are waiting on the condition variable */
+int SDL_SignalCondition(SDL_Condition *cond)
+{
+    int retval;
+
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+
+    retval = 0;
+    if (pthread_cond_signal(&cond->cond) != 0) {
+        return SDL_SetError("pthread_cond_signal() failed");
+    }
+    return retval;
+}
+
+/* Restart all threads that are waiting on the condition variable */
+int SDL_BroadcastCondition(SDL_Condition *cond)
+{
+    int retval;
+
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+
+    retval = 0;
+    if (pthread_cond_broadcast(&cond->cond) != 0) {
+        return SDL_SetError("pthread_cond_broadcast() failed");
+    }
+    return retval;
+}
+
+int SDL_WaitConditionTimeoutNS(SDL_Condition *cond, SDL_Mutex *mutex, Sint64 timeoutNS)
+{
+    int retval;
+#ifndef HAVE_CLOCK_GETTIME
+    struct timeval delta;
+#endif
+    struct timespec abstime;
+
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+
+    if (timeoutNS < 0) {
+        if (pthread_cond_wait(&cond->cond, &mutex->id) != 0) {
+            return SDL_SetError("pthread_cond_wait() failed");
+        }
+        return 0;
+    }
+
+#ifdef HAVE_CLOCK_GETTIME
+    clock_gettime(CLOCK_REALTIME, &abstime);
+
+    abstime.tv_sec += (timeoutNS / SDL_NS_PER_SECOND);
+    abstime.tv_nsec += (timeoutNS % SDL_NS_PER_SECOND);
+#else
+    gettimeofday(&delta, NULL);
+
+    abstime.tv_sec = delta.tv_sec + (timeoutNS / SDL_NS_PER_SECOND);
+    abstime.tv_nsec = SDL_US_TO_NS(delta.tv_usec) + (timeoutNS % SDL_NS_PER_SECOND);
+#endif
+    while (abstime.tv_nsec > 1000000000) {
+        abstime.tv_sec += 1;
+        abstime.tv_nsec -= 1000000000;
+    }
+
+tryagain:
+    retval = pthread_cond_timedwait(&cond->cond, &mutex->id, &abstime);
+    switch (retval) {
+    case EINTR:
+        goto tryagain;
+        /* break; -Wunreachable-code-break */
+    case ETIMEDOUT:
+        retval = SDL_MUTEX_TIMEDOUT;
+        break;
+    case 0:
+        break;
+    default:
+        retval = SDL_SetError("pthread_cond_timedwait() failed");
+    }
+    return retval;
+}

external/sdl/SDL/src/thread/pthread/SDL_sysmutex.c

@@ -0,0 +1,175 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#include <errno.h>
+#include <pthread.h>
+
+#include "SDL_sysmutex_c.h"
+
+SDL_Mutex *SDL_CreateMutex(void)
+{
+    SDL_Mutex *mutex;
+    pthread_mutexattr_t attr;
+
+    /* Allocate the structure */
+    mutex = (SDL_Mutex *)SDL_calloc(1, sizeof(*mutex));
+    if (mutex) {
+        pthread_mutexattr_init(&attr);
+#ifdef SDL_THREAD_PTHREAD_RECURSIVE_MUTEX
+        pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
+#elif defined(SDL_THREAD_PTHREAD_RECURSIVE_MUTEX_NP)
+        pthread_mutexattr_setkind_np(&attr, PTHREAD_MUTEX_RECURSIVE_NP);
+#else
+        /* No extra attributes necessary */
+#endif
+        if (pthread_mutex_init(&mutex->id, &attr) != 0) {
+            SDL_SetError("pthread_mutex_init() failed");
+            SDL_free(mutex);
+            mutex = NULL;
+        }
+    } else {
+        SDL_OutOfMemory();
+    }
+    return mutex;
+}
+
+void SDL_DestroyMutex(SDL_Mutex *mutex)
+{
+    if (mutex) {
+        pthread_mutex_destroy(&mutex->id);
+        SDL_free(mutex);
+    }
+}
+
+/* Lock the mutex */
+int SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+#ifdef FAKE_RECURSIVE_MUTEX
+    pthread_t this_thread;
+#endif
+
+    if (mutex == NULL) {
+        return 0;
+    }
+
+#ifdef FAKE_RECURSIVE_MUTEX
+    this_thread = pthread_self();
+    if (mutex->owner == this_thread) {
+        ++mutex->recursive;
+    } else {
+        /* The order of operations is important.
+           We set the locking thread id after we obtain the lock
+           so unlocks from other threads will fail.
+         */
+        if (pthread_mutex_lock(&mutex->id) == 0) {
+            mutex->owner = this_thread;
+            mutex->recursive = 0;
+        } else {
+            return SDL_SetError("pthread_mutex_lock() failed");
+        }
+    }
+#else
+    if (pthread_mutex_lock(&mutex->id) != 0) {
+        return SDL_SetError("pthread_mutex_lock() failed");
+    }
+#endif
+    return 0;
+}
+
+int SDL_TryLockMutex(SDL_Mutex *mutex)
+{
+    int retval;
+    int result;
+#ifdef FAKE_RECURSIVE_MUTEX
+    pthread_t this_thread;
+#endif
+
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    retval = 0;
+#ifdef FAKE_RECURSIVE_MUTEX
+    this_thread = pthread_self();
+    if (mutex->owner == this_thread) {
+        ++mutex->recursive;
+    } else {
+        /* The order of operations is important.
+         We set the locking thread id after we obtain the lock
+         so unlocks from other threads will fail.
+         */
+        result = pthread_mutex_trylock(&mutex->id);
+        if (result == 0) {
+            mutex->owner = this_thread;
+            mutex->recursive = 0;
+        } else if (result == EBUSY) {
+            retval = SDL_MUTEX_TIMEDOUT;
+        } else {
+            retval = SDL_SetError("pthread_mutex_trylock() failed");
+        }
+    }
+#else
+    result = pthread_mutex_trylock(&mutex->id);
+    if (result != 0) {
+        if (result == EBUSY) {
+            retval = SDL_MUTEX_TIMEDOUT;
+        } else {
+            retval = SDL_SetError("pthread_mutex_trylock() failed");
+        }
+    }
+#endif
+    return retval;
+}
+
+int SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    if (mutex == NULL) {
+        return 0;
+    }
+
+#ifdef FAKE_RECURSIVE_MUTEX
+    /* We can only unlock the mutex if we own it */
+    if (pthread_self() == mutex->owner) {
+        if (mutex->recursive) {
+            --mutex->recursive;
+        } else {
+            /* The order of operations is important.
+               First reset the owner so another thread doesn't lock
+               the mutex and set the ownership before we reset it,
+               then release the lock semaphore.
+             */
+            mutex->owner = 0;
+            pthread_mutex_unlock(&mutex->id);
+        }
+    } else {
+        return SDL_SetError("mutex not owned by this thread");
+    }
+
+#else
+    if (pthread_mutex_unlock(&mutex->id) != 0) {
+        return SDL_SetError("pthread_mutex_unlock() failed");
+    }
+#endif /* FAKE_RECURSIVE_MUTEX */
+
+    return 0;
+}
+

external/sdl/SDL/src/thread/pthread/SDL_sysmutex_c.h

@@ -0,0 +1,40 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifndef SDL_mutex_c_h_
+#define SDL_mutex_c_h_
+
+#if !(defined(SDL_THREAD_PTHREAD_RECURSIVE_MUTEX) || \
+    defined(SDL_THREAD_PTHREAD_RECURSIVE_MUTEX_NP))
+#define FAKE_RECURSIVE_MUTEX
+#endif
+
+struct SDL_Mutex
+{
+    pthread_mutex_t id;
+#ifdef FAKE_RECURSIVE_MUTEX
+    int recursive;
+    pthread_t owner;
+#endif
+};
+
+#endif /* SDL_mutex_c_h_ */

external/sdl/SDL/src/thread/pthread/SDL_sysrwlock.c

@@ -0,0 +1,126 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#include <errno.h>
+#include <pthread.h>
+
+struct SDL_RWLock
+{
+    pthread_rwlock_t id;
+};
+
+
+SDL_RWLock *SDL_CreateRWLock(void)
+{
+    SDL_RWLock *rwlock;
+
+    /* Allocate the structure */
+    rwlock = (SDL_RWLock *)SDL_calloc(1, sizeof(*rwlock));
+    if (rwlock) {
+        if (pthread_rwlock_init(&rwlock->id, NULL) != 0) {
+            SDL_SetError("pthread_rwlock_init() failed");
+            SDL_free(rwlock);
+            rwlock = NULL;
+        }
+    } else {
+        SDL_OutOfMemory();
+    }
+    return rwlock;
+}
+
+void SDL_DestroyRWLock(SDL_RWLock *rwlock)
+{
+    if (rwlock) {
+        pthread_rwlock_destroy(&rwlock->id);
+        SDL_free(rwlock);
+    }
+}
+
+int SDL_LockRWLockForReading(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    if (rwlock == NULL) {
+        return SDL_InvalidParamError("rwlock");
+    } else if (pthread_rwlock_rdlock(&rwlock->id) != 0) {
+        return SDL_SetError("pthread_rwlock_rdlock() failed");
+    }
+    return 0;
+}
+
+int SDL_LockRWLockForWriting(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    if (rwlock == NULL) {
+        return SDL_InvalidParamError("rwlock");
+    } else if (pthread_rwlock_wrlock(&rwlock->id) != 0) {
+        return SDL_SetError("pthread_rwlock_wrlock() failed");
+    }
+    return 0;
+}
+
+int SDL_TryLockRWLockForReading(SDL_RWLock *rwlock)
+{
+    int retval = 0;
+
+    if (rwlock == NULL) {
+        retval = SDL_InvalidParamError("rwlock");
+    } else {
+        const int result = pthread_rwlock_tryrdlock(&rwlock->id);
+        if (result != 0) {
+            if (result == EBUSY) {
+                retval = SDL_RWLOCK_TIMEDOUT;
+            } else {
+                retval = SDL_SetError("pthread_rwlock_tryrdlock() failed");
+            }
+        }
+    }
+    return retval;
+}
+
+int SDL_TryLockRWLockForWriting(SDL_RWLock *rwlock)
+{
+    int retval = 0;
+
+    if (rwlock == NULL) {
+        retval = SDL_InvalidParamError("rwlock");
+    } else {
+        const int result = pthread_rwlock_trywrlock(&rwlock->id);
+        if (result != 0) {
+            if (result == EBUSY) {
+                retval = SDL_RWLOCK_TIMEDOUT;
+            } else {
+                retval = SDL_SetError("pthread_rwlock_tryrdlock() failed");
+            }
+        }
+    }
+
+    return retval;
+}
+
+int SDL_UnlockRWLock(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    if (rwlock == NULL) {
+        return SDL_InvalidParamError("rwlock");
+    } else if (pthread_rwlock_unlock(&rwlock->id) != 0) {
+        return SDL_SetError("pthread_rwlock_unlock() failed");
+    }
+    return 0;
+}
+

external/sdl/SDL/src/thread/pthread/SDL_syssem.c

@@ -0,0 +1,182 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#include <errno.h>
+#include <pthread.h>
+#include <semaphore.h>
+#include <sys/time.h>
+#include <time.h>
+
+/* Wrapper around POSIX 1003.1b semaphores */
+
+#if defined(__MACOS__) || defined(__IOS__)
+/* macOS doesn't support sem_getvalue() as of version 10.4 */
+#include "../generic/SDL_syssem.c"
+#else
+
+struct SDL_Semaphore
+{
+    sem_t sem;
+};
+
+/* Create a semaphore, initialized with value */
+SDL_Semaphore *SDL_CreateSemaphore(Uint32 initial_value)
+{
+    SDL_Semaphore *sem = (SDL_Semaphore *)SDL_malloc(sizeof(SDL_Semaphore));
+    if (sem != NULL) {
+        if (sem_init(&sem->sem, 0, initial_value) < 0) {
+            SDL_SetError("sem_init() failed");
+            SDL_free(sem);
+            sem = NULL;
+        }
+    } else {
+        SDL_OutOfMemory();
+    }
+    return sem;
+}
+
+void SDL_DestroySemaphore(SDL_Semaphore *sem)
+{
+    if (sem != NULL) {
+        sem_destroy(&sem->sem);
+        SDL_free(sem);
+    }
+}
+
+int SDL_WaitSemaphoreTimeoutNS(SDL_Semaphore *sem, Sint64 timeoutNS)
+{
+    int retval = 0;
+#ifdef HAVE_SEM_TIMEDWAIT
+#ifndef HAVE_CLOCK_GETTIME
+    struct timeval now;
+#endif
+    struct timespec ts_timeout;
+#else
+    Uint64 end;
+#endif
+
+    if (sem == NULL) {
+        return SDL_InvalidParamError("sem");
+    }
+
+    /* Try the easy cases first */
+    if (timeoutNS == 0) {
+        retval = SDL_MUTEX_TIMEDOUT;
+        if (sem_trywait(&sem->sem) == 0) {
+            retval = 0;
+        }
+        return retval;
+    }
+    if (timeoutNS < 0) {
+        do {
+            retval = sem_wait(&sem->sem);
+        } while (retval < 0 && errno == EINTR);
+
+        if (retval < 0) {
+            retval = SDL_SetError("sem_wait() failed");
+        }
+        return retval;
+    }
+
+#ifdef HAVE_SEM_TIMEDWAIT
+    /* Setup the timeout. sem_timedwait doesn't wait for
+     * a lapse of time, but until we reach a certain time.
+     * This time is now plus the timeout.
+     */
+#ifdef HAVE_CLOCK_GETTIME
+    clock_gettime(CLOCK_REALTIME, &ts_timeout);
+
+    /* Add our timeout to current time */
+    ts_timeout.tv_sec += (timeoutNS / SDL_NS_PER_SECOND);
+    ts_timeout.tv_nsec += (timeoutNS % SDL_NS_PER_SECOND);
+#else
+    gettimeofday(&now, NULL);
+
+    /* Add our timeout to current time */
+    ts_timeout.tv_sec = now.tv_sec + (timeoutNS / SDL_NS_PER_SECOND);
+    ts_timeout.tv_nsec = SDL_US_TO_NS(now.tv_usec) + (timeoutNS % SDL_NS_PER_SECOND);
+#endif
+
+    /* Wrap the second if needed */
+    while (ts_timeout.tv_nsec > 1000000000) {
+        ts_timeout.tv_sec += 1;
+        ts_timeout.tv_nsec -= 1000000000;
+    }
+
+    /* Wait. */
+    do {
+        retval = sem_timedwait(&sem->sem, &ts_timeout);
+    } while (retval < 0 && errno == EINTR);
+
+    if (retval < 0) {
+        if (errno == ETIMEDOUT) {
+            retval = SDL_MUTEX_TIMEDOUT;
+        } else {
+            SDL_SetError("sem_timedwait returned an error: %s", strerror(errno));
+        }
+    }
+#else
+    end = SDL_GetTicksNS() + timeoutNS;
+    while (sem_trywait(&sem->sem) != 0) {
+        if (SDL_GetTicksNS() >= end) {
+            retval = SDL_MUTEX_TIMEDOUT;
+            break;
+        }
+        SDL_DelayNS(100);
+    }
+#endif /* HAVE_SEM_TIMEDWAIT */
+
+    return retval;
+}
+
+Uint32 SDL_GetSemaphoreValue(SDL_Semaphore *sem)
+{
+    int ret = 0;
+
+    if (sem == NULL) {
+        SDL_InvalidParamError("sem");
+        return 0;
+    }
+
+    sem_getvalue(&sem->sem, &ret);
+    if (ret < 0) {
+        ret = 0;
+    }
+    return (Uint32)ret;
+}
+
+int SDL_PostSemaphore(SDL_Semaphore *sem)
+{
+    int retval;
+
+    if (sem == NULL) {
+        return SDL_InvalidParamError("sem");
+    }
+
+    retval = sem_post(&sem->sem);
+    if (retval < 0) {
+        SDL_SetError("sem_post() failed");
+    }
+    return retval;
+}
+
+#endif /* __MACOS__ */

external/sdl/SDL/src/thread/pthread/SDL_systhread.c

@@ -0,0 +1,283 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#include <pthread.h>
+
+#ifdef HAVE_PTHREAD_NP_H
+#include <pthread_np.h>
+#endif
+
+#include <signal.h>
+#include <errno.h>
+
+#ifdef __LINUX__
+#include <sys/time.h>
+#include <sys/resource.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+#include "../../core/linux/SDL_dbus.h"
+#endif /* __LINUX__ */
+
+#if (defined(__LINUX__) || defined(__MACOS__) || defined(__IOS__)) && defined(HAVE_DLOPEN)
+#include <dlfcn.h>
+#ifndef RTLD_DEFAULT
+#define RTLD_DEFAULT NULL
+#endif
+#endif
+
+#include "../SDL_thread_c.h"
+#include "../SDL_systhread.h"
+#ifdef __ANDROID__
+#include "../../core/android/SDL_android.h"
+#endif
+
+#ifdef __HAIKU__
+#include <kernel/OS.h>
+#endif
+
+/* List of signals to mask in the subthreads */
+static const int sig_list[] = {
+    SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGCHLD, SIGWINCH,
+    SIGVTALRM, SIGPROF, 0
+};
+
+static void *RunThread(void *data)
+{
+#ifdef __ANDROID__
+    Android_JNI_SetupThread();
+#endif
+    SDL_RunThread((SDL_Thread *)data);
+    return NULL;
+}
+
+#if (defined(__MACOS__) || defined(__IOS__)) && defined(HAVE_DLOPEN)
+static SDL_bool checked_setname = SDL_FALSE;
+static int (*ppthread_setname_np)(const char *) = NULL;
+#elif defined(__LINUX__) && defined(HAVE_DLOPEN)
+static SDL_bool checked_setname = SDL_FALSE;
+static int (*ppthread_setname_np)(pthread_t, const char *) = NULL;
+#endif
+int SDL_SYS_CreateThread(SDL_Thread *thread)
+{
+    pthread_attr_t type;
+
+/* do this here before any threads exist, so there's no race condition. */
+#if (defined(__MACOS__) || defined(__IOS__) || defined(__LINUX__)) && defined(HAVE_DLOPEN)
+    if (!checked_setname) {
+        void *fn = dlsym(RTLD_DEFAULT, "pthread_setname_np");
+#if defined(__MACOS__) || defined(__IOS__)
+        ppthread_setname_np = (int (*)(const char *))fn;
+#elif defined(__LINUX__)
+        ppthread_setname_np = (int (*)(pthread_t, const char *))fn;
+#endif
+        checked_setname = SDL_TRUE;
+    }
+#endif
+
+    /* Set the thread attributes */
+    if (pthread_attr_init(&type) != 0) {
+        return SDL_SetError("Couldn't initialize pthread attributes");
+    }
+    pthread_attr_setdetachstate(&type, PTHREAD_CREATE_JOINABLE);
+
+    /* Set caller-requested stack size. Otherwise: use the system default. */
+    if (thread->stacksize) {
+        pthread_attr_setstacksize(&type, thread->stacksize);
+    }
+
+    /* Create the thread and go! */
+    if (pthread_create(&thread->handle, &type, RunThread, thread) != 0) {
+        return SDL_SetError("Not enough resources to create thread");
+    }
+
+    return 0;
+}
+
+void SDL_SYS_SetupThread(const char *name)
+{
+    int i;
+    sigset_t mask;
+
+    if (name != NULL) {
+#if (defined(__MACOS__) || defined(__IOS__) || defined(__LINUX__)) && defined(HAVE_DLOPEN)
+        SDL_assert(checked_setname);
+        if (ppthread_setname_np != NULL) {
+#if defined(__MACOS__) || defined(__IOS__)
+            ppthread_setname_np(name);
+#elif defined(__LINUX__)
+            if (ppthread_setname_np(pthread_self(), name) == ERANGE) {
+                char namebuf[16]; /* Limited to 16 char */
+                SDL_strlcpy(namebuf, name, sizeof(namebuf));
+                ppthread_setname_np(pthread_self(), namebuf);
+            }
+#endif
+        }
+#elif defined(HAVE_PTHREAD_SETNAME_NP)
+#ifdef __NETBSD__
+        pthread_setname_np(pthread_self(), "%s", name);
+#else
+        if (pthread_setname_np(pthread_self(), name) == ERANGE) {
+            char namebuf[16]; /* Limited to 16 char */
+            SDL_strlcpy(namebuf, name, sizeof(namebuf));
+            pthread_setname_np(pthread_self(), namebuf);
+        }
+#endif
+#elif defined(HAVE_PTHREAD_SET_NAME_NP)
+        pthread_set_name_np(pthread_self(), name);
+#elif defined(__HAIKU__)
+        /* The docs say the thread name can't be longer than B_OS_NAME_LENGTH. */
+        char namebuf[B_OS_NAME_LENGTH];
+        SDL_strlcpy(namebuf, name, sizeof(namebuf));
+        rename_thread(find_thread(NULL), namebuf);
+#endif
+    }
+
+    /* Mask asynchronous signals for this thread */
+    sigemptyset(&mask);
+    for (i = 0; sig_list[i]; ++i) {
+        sigaddset(&mask, sig_list[i]);
+    }
+    pthread_sigmask(SIG_BLOCK, &mask, 0);
+
+#ifdef PTHREAD_CANCEL_ASYNCHRONOUS
+    /* Allow ourselves to be asynchronously cancelled */
+    {
+        int oldstate;
+        pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, &oldstate);
+    }
+#endif
+}
+
+SDL_threadID SDL_ThreadID(void)
+{
+    return (SDL_threadID)pthread_self();
+}
+
+int SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
+{
+#ifdef __RISCOS__
+    /* FIXME: Setting thread priority does not seem to be supported */
+    return 0;
+#else
+    struct sched_param sched;
+    int policy;
+    int pri_policy;
+    pthread_t thread = pthread_self();
+    const char *policyhint = SDL_GetHint(SDL_HINT_THREAD_PRIORITY_POLICY);
+    const SDL_bool timecritical_realtime_hint = SDL_GetHintBoolean(SDL_HINT_THREAD_FORCE_REALTIME_TIME_CRITICAL, SDL_FALSE);
+
+    if (pthread_getschedparam(thread, &policy, &sched) != 0) {
+        return SDL_SetError("pthread_getschedparam() failed");
+    }
+
+    /* Higher priority levels may require changing the pthread scheduler policy
+     * for the thread.  SDL will make such changes by default but there is
+     * also a hint allowing that behavior to be overridden. */
+    switch (priority) {
+    case SDL_THREAD_PRIORITY_LOW:
+    case SDL_THREAD_PRIORITY_NORMAL:
+        pri_policy = SCHED_OTHER;
+        break;
+    case SDL_THREAD_PRIORITY_HIGH:
+    case SDL_THREAD_PRIORITY_TIME_CRITICAL:
+#if defined(__MACOS__) || defined(__IOS__) || defined(__TVOS__)
+        /* Apple requires SCHED_RR for high priority threads */
+        pri_policy = SCHED_RR;
+        break;
+#else
+        pri_policy = SCHED_OTHER;
+        break;
+#endif
+    default:
+        pri_policy = policy;
+        break;
+    }
+
+    if (timecritical_realtime_hint && priority == SDL_THREAD_PRIORITY_TIME_CRITICAL) {
+        pri_policy = SCHED_RR;
+    }
+
+    if (policyhint) {
+        if (SDL_strcmp(policyhint, "current") == 0) {
+            /* Leave current thread scheduler policy unchanged */
+        } else if (SDL_strcmp(policyhint, "other") == 0) {
+            policy = SCHED_OTHER;
+        } else if (SDL_strcmp(policyhint, "rr") == 0) {
+            policy = SCHED_RR;
+        } else if (SDL_strcmp(policyhint, "fifo") == 0) {
+            policy = SCHED_FIFO;
+        } else {
+            policy = pri_policy;
+        }
+    } else {
+        policy = pri_policy;
+    }
+
+#ifdef __LINUX__
+    {
+        pid_t linuxTid = syscall(SYS_gettid);
+        return SDL_LinuxSetThreadPriorityAndPolicy(linuxTid, priority, policy);
+    }
+#else
+    if (priority == SDL_THREAD_PRIORITY_LOW) {
+        sched.sched_priority = sched_get_priority_min(policy);
+    } else if (priority == SDL_THREAD_PRIORITY_TIME_CRITICAL) {
+        sched.sched_priority = sched_get_priority_max(policy);
+    } else {
+        int min_priority = sched_get_priority_min(policy);
+        int max_priority = sched_get_priority_max(policy);
+
+#if defined(__MACOS__) || defined(__IOS__) || defined(__TVOS__)
+        if (min_priority == 15 && max_priority == 47) {
+            /* Apple has a specific set of thread priorities */
+            if (priority == SDL_THREAD_PRIORITY_HIGH) {
+                sched.sched_priority = 45;
+            } else {
+                sched.sched_priority = 37;
+            }
+        } else
+#endif /* __MACOS__ || __IOS__ || __TVOS__ */
+        {
+            sched.sched_priority = (min_priority + (max_priority - min_priority) / 2);
+            if (priority == SDL_THREAD_PRIORITY_HIGH) {
+                sched.sched_priority += ((max_priority - min_priority) / 4);
+            }
+        }
+    }
+    if (pthread_setschedparam(thread, policy, &sched) != 0) {
+        return SDL_SetError("pthread_setschedparam() failed");
+    }
+    return 0;
+#endif /* linux */
+#endif /* #if __RISCOS__ */
+}
+
+void SDL_SYS_WaitThread(SDL_Thread *thread)
+{
+    pthread_join(thread->handle, 0);
+}
+
+void SDL_SYS_DetachThread(SDL_Thread *thread)
+{
+    pthread_detach(thread->handle);
+}

external/sdl/SDL/src/thread/pthread/SDL_systhread_c.h

@@ -0,0 +1,25 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#include <pthread.h>
+
+typedef pthread_t SYS_ThreadHandle;

external/sdl/SDL/src/thread/pthread/SDL_systls.c

@@ -0,0 +1,64 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+#include "../SDL_systhread.h"
+#include "../SDL_thread_c.h"
+
+#include <pthread.h>
+
+#define INVALID_PTHREAD_KEY ((pthread_key_t)-1)
+
+static pthread_key_t thread_local_storage = INVALID_PTHREAD_KEY;
+static SDL_bool generic_local_storage = SDL_FALSE;
+
+SDL_TLSData *SDL_SYS_GetTLSData(void)
+{
+    if (thread_local_storage == INVALID_PTHREAD_KEY && !generic_local_storage) {
+        static SDL_SpinLock lock;
+        SDL_AtomicLock(&lock);
+        if (thread_local_storage == INVALID_PTHREAD_KEY && !generic_local_storage) {
+            pthread_key_t storage;
+            if (pthread_key_create(&storage, NULL) == 0) {
+                SDL_MemoryBarrierRelease();
+                thread_local_storage = storage;
+            } else {
+                generic_local_storage = SDL_TRUE;
+            }
+        }
+        SDL_AtomicUnlock(&lock);
+    }
+    if (generic_local_storage) {
+        return SDL_Generic_GetTLSData();
+    }
+    SDL_MemoryBarrierAcquire();
+    return (SDL_TLSData *)pthread_getspecific(thread_local_storage);
+}
+
+int SDL_SYS_SetTLSData(SDL_TLSData *data)
+{
+    if (generic_local_storage) {
+        return SDL_Generic_SetTLSData(data);
+    }
+    if (pthread_setspecific(thread_local_storage, data) != 0) {
+        return SDL_SetError("pthread_setspecific() failed");
+    }
+    return 0;
+}

external/sdl/SDL/src/thread/stdcpp/SDL_syscond.cpp

@@ -0,0 +1,141 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+extern "C" {
+}
+
+#include <chrono>
+#include <condition_variable>
+#include <ratio>
+#include <system_error>
+
+#include "SDL_sysmutex_c.h"
+
+struct SDL_Condition
+{
+    std::condition_variable_any cpp_cond;
+};
+
+/* Create a condition variable */
+extern "C" SDL_Condition *
+SDL_CreateCondition(void)
+{
+    /* Allocate and initialize the condition variable */
+    try {
+        SDL_Condition *cond = new SDL_Condition;
+        return cond;
+    } catch (std::system_error &ex) {
+        SDL_SetError("unable to create a C++ condition variable: code=%d; %s", ex.code(), ex.what());
+        return NULL;
+    } catch (std::bad_alloc &) {
+        SDL_OutOfMemory();
+        return NULL;
+    }
+}
+
+/* Destroy a condition variable */
+extern "C" void
+SDL_DestroyCondition(SDL_Condition *cond)
+{
+    if (cond != NULL) {
+        delete cond;
+    }
+}
+
+/* Restart one of the threads that are waiting on the condition variable */
+extern "C" int
+SDL_SignalCondition(SDL_Condition *cond)
+{
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+
+    cond->cpp_cond.notify_one();
+    return 0;
+}
+
+/* Restart all threads that are waiting on the condition variable */
+extern "C" int
+SDL_BroadcastCondition(SDL_Condition *cond)
+{
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+
+    cond->cpp_cond.notify_all();
+    return 0;
+}
+
+/* Wait on the condition variable for at most 'timeoutNS' nanoseconds.
+   The mutex must be locked before entering this function!
+   The mutex is unlocked during the wait, and locked again after the wait.
+
+Typical use:
+
+Thread A:
+    SDL_LockMutex(lock);
+    while ( ! condition ) {
+        SDL_WaitCondition(cond, lock);
+    }
+    SDL_UnlockMutex(lock);
+
+Thread B:
+    SDL_LockMutex(lock);
+    ...
+    condition = true;
+    ...
+    SDL_SignalCondition(cond);
+    SDL_UnlockMutex(lock);
+ */
+extern "C" int
+SDL_WaitConditionTimeoutNS(SDL_Condition *cond, SDL_Mutex *mutex, Sint64 timeoutNS)
+{
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+
+    if (mutex == NULL) {
+        return SDL_InvalidParamError("mutex");
+    }
+
+    try {
+        std::unique_lock<std::recursive_mutex> cpp_lock(mutex->cpp_mutex, std::adopt_lock_t());
+        if (timeoutNS < 0) {
+            cond->cpp_cond.wait(
+                cpp_lock);
+            cpp_lock.release();
+            return 0;
+        } else {
+            auto wait_result = cond->cpp_cond.wait_for(
+                cpp_lock,
+                std::chrono::duration<Sint64, std::nano>(timeoutNS));
+            cpp_lock.release();
+            if (wait_result == std::cv_status::timeout) {
+                return SDL_MUTEX_TIMEDOUT;
+            } else {
+                return 0;
+            }
+        }
+    } catch (std::system_error &ex) {
+        return SDL_SetError("Unable to wait on a C++ condition variable: code=%d; %s", ex.code(), ex.what());
+    }
+}

external/sdl/SDL/src/thread/stdcpp/SDL_sysmutex.cpp

@@ -0,0 +1,100 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+extern "C" {
+#include "SDL_systhread_c.h"
+}
+
+#include <system_error>
+
+#include "SDL_sysmutex_c.h"
+#include <Windows.h>
+
+/* Create a mutex */
+extern "C" SDL_Mutex *
+SDL_CreateMutex(void)
+{
+    /* Allocate and initialize the mutex */
+    try {
+        SDL_Mutex *mutex = new SDL_Mutex;
+        return mutex;
+    } catch (std::system_error &ex) {
+        SDL_SetError("unable to create a C++ mutex: code=%d; %s", ex.code(), ex.what());
+        return NULL;
+    } catch (std::bad_alloc &) {
+        SDL_OutOfMemory();
+        return NULL;
+    }
+}
+
+/* Free the mutex */
+extern "C" void
+SDL_DestroyMutex(SDL_Mutex *mutex)
+{
+    if (mutex != NULL) {
+        delete mutex;
+    }
+}
+
+/* Lock the mutex */
+extern "C" int
+SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    try {
+        mutex->cpp_mutex.lock();
+        return 0;
+    } catch (std::system_error &ex) {
+        return SDL_SetError("unable to lock a C++ mutex: code=%d; %s", ex.code(), ex.what());
+    }
+}
+
+/* TryLock the mutex */
+int SDL_TryLockMutex(SDL_Mutex *mutex)
+{
+    int retval = 0;
+
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    if (mutex->cpp_mutex.try_lock() == false) {
+        retval = SDL_MUTEX_TIMEDOUT;
+    }
+    return retval;
+}
+
+/* Unlock the mutex */
+extern "C" int
+SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    mutex->cpp_mutex.unlock();
+    return 0;
+}
+

external/sdl/SDL/src/thread/stdcpp/SDL_sysmutex_c.h

@@ -0,0 +1,29 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#include <mutex>
+
+struct SDL_Mutex
+{
+    std::recursive_mutex cpp_mutex;
+};
+

external/sdl/SDL/src/thread/stdcpp/SDL_sysrwlock.cpp

@@ -0,0 +1,130 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#include <shared_mutex>
+#include <system_error>
+#include <Windows.h>
+
+struct SDL_RWLock
+{
+    std::shared_mutex cpp_mutex;
+    SDL_threadID write_owner;
+};
+
+/* Create a rwlock */
+extern "C" SDL_RWLock *SDL_CreateRWLock(void)
+{
+    /* Allocate and initialize the rwlock */
+    try {
+        SDL_RWLock *rwlock = new SDL_RWLock;
+        return rwlock;
+    } catch (std::system_error &ex) {
+        SDL_SetError("unable to create a C++ rwlock: code=%d; %s", ex.code(), ex.what());
+        return NULL;
+    } catch (std::bad_alloc &) {
+        SDL_OutOfMemory();
+        return NULL;
+    }
+}
+
+/* Free the rwlock */
+extern "C" void SDL_DestroyRWLock(SDL_RWLock *rwlock)
+{
+    if (rwlock != NULL) {
+        delete rwlock;
+    }
+}
+
+/* Lock the rwlock */
+extern "C" int SDL_LockRWLockForReading(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    if (!rwlock) {
+        return SDL_InvalidParamError("rwlock");
+    }
+
+    try {
+        rwlock->cpp_mutex.lock_shared();
+        return 0;
+    } catch (std::system_error &ex) {
+        return SDL_SetError("unable to lock a C++ rwlock: code=%d; %s", ex.code(), ex.what());
+    }
+}
+
+/* Lock the rwlock for writing */
+extern "C" int SDL_LockRWLockForWriting(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    if (!rwlock) {
+        return SDL_InvalidParamError("rwlock");
+    }
+
+    try {
+        rwlock->cpp_mutex.lock();
+        rwlock->write_owner = SDL_ThreadID();
+        return 0;
+    } catch (std::system_error &ex) {
+        return SDL_SetError("unable to lock a C++ rwlock: code=%d; %s", ex.code(), ex.what());
+    }
+}
+
+/* TryLock the rwlock for reading */
+int SDL_TryLockRWLockForReading(SDL_RWLock *rwlock)
+{
+    int retval = 0;
+
+    if (!rwlock) {
+        retval = SDL_InvalidParamError("rwlock");
+    } else if (rwlock->cpp_mutex.try_lock_shared() == false) {
+        retval = SDL_RWLOCK_TIMEDOUT;
+    }
+    return retval;
+}
+
+/* TryLock the rwlock for writing */
+int SDL_TryLockRWLockForWriting(SDL_RWLock *rwlock)
+{
+    int retval = 0;
+
+    if (!rwlock) {
+        retval = SDL_InvalidParamError("rwlock");
+    } else if (rwlock->cpp_mutex.try_lock() == false) {
+        retval = SDL_RWLOCK_TIMEDOUT;
+    } else {
+        rwlock->write_owner = SDL_ThreadID();
+    }
+    return retval;
+}
+
+/* Unlock the rwlock */
+extern "C" int
+SDL_UnlockRWLock(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    if (!rwlock) {
+        return SDL_InvalidParamError("rwlock");
+    } else if (rwlock->write_owner == SDL_ThreadID()) {
+        rwlock->write_owner = 0;
+        rwlock->cpp_mutex.unlock();
+    } else {
+        rwlock->cpp_mutex.unlock_shared();
+    }
+    return 0;
+}
+

external/sdl/SDL/src/thread/stdcpp/SDL_systhread.cpp

@@ -0,0 +1,161 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+/* Thread management routines for SDL */
+
+extern "C" {
+#include "../SDL_thread_c.h"
+#include "../SDL_systhread.h"
+}
+
+#include <mutex>
+#include <thread>
+#include <system_error>
+
+#ifdef __WINRT__
+#include <Windows.h>
+#endif
+
+static void RunThread(void *args)
+{
+    SDL_RunThread((SDL_Thread *)args);
+}
+
+extern "C" int
+SDL_SYS_CreateThread(SDL_Thread *thread)
+{
+    try {
+        // !!! FIXME: no way to set a thread stack size here.
+        std::thread cpp_thread(RunThread, thread);
+        thread->handle = (void *)new std::thread(std::move(cpp_thread));
+        return 0;
+    } catch (std::system_error &ex) {
+        return SDL_SetError("unable to start a C++ thread: code=%d; %s", ex.code(), ex.what());
+    } catch (std::bad_alloc &) {
+        return SDL_OutOfMemory();
+    }
+}
+
+extern "C" void
+SDL_SYS_SetupThread(const char *name)
+{
+    // Make sure a thread ID gets assigned ASAP, for debugging purposes:
+    SDL_ThreadID();
+    return;
+}
+
+extern "C" SDL_threadID
+SDL_ThreadID(void)
+{
+#ifdef __WINRT__
+    return GetCurrentThreadId();
+#else
+    // HACK: Mimic a thread ID, if one isn't otherwise available.
+    static thread_local SDL_threadID current_thread_id = 0;
+    static SDL_threadID next_thread_id = 1;
+    static std::mutex next_thread_id_mutex;
+
+    if (current_thread_id == 0) {
+        std::lock_guard<std::mutex> lock(next_thread_id_mutex);
+        current_thread_id = next_thread_id;
+        ++next_thread_id;
+    }
+
+    return current_thread_id;
+#endif
+}
+
+extern "C" int
+SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
+{
+#ifdef __WINRT__
+    int value;
+
+    if (priority == SDL_THREAD_PRIORITY_LOW) {
+        value = THREAD_PRIORITY_LOWEST;
+    } else if (priority == SDL_THREAD_PRIORITY_HIGH) {
+        value = THREAD_PRIORITY_HIGHEST;
+    } else if (priority == SDL_THREAD_PRIORITY_TIME_CRITICAL) {
+        // FIXME: WinRT does not support TIME_CRITICAL! -flibit
+        SDL_LogWarn(SDL_LOG_CATEGORY_SYSTEM, "TIME_CRITICAL unsupported, falling back to HIGHEST");
+        value = THREAD_PRIORITY_HIGHEST;
+    } else {
+        value = THREAD_PRIORITY_NORMAL;
+    }
+    if (!SetThreadPriority(GetCurrentThread(), value)) {
+        return WIN_SetError("SetThreadPriority()");
+    }
+    return 0;
+#else
+    return SDL_Unsupported();
+#endif
+}
+
+extern "C" void
+SDL_SYS_WaitThread(SDL_Thread *thread)
+{
+    if (!thread) {
+        return;
+    }
+
+    try {
+        std::thread *cpp_thread = (std::thread *)thread->handle;
+        if (cpp_thread->joinable()) {
+            cpp_thread->join();
+        }
+    } catch (std::system_error &) {
+        // An error occurred when joining the thread.  SDL_WaitThread does not,
+        // however, seem to provide a means to report errors to its callers
+        // though!
+    }
+}
+
+extern "C" void
+SDL_SYS_DetachThread(SDL_Thread *thread)
+{
+    if (!thread) {
+        return;
+    }
+
+    try {
+        std::thread *cpp_thread = (std::thread *)thread->handle;
+        if (cpp_thread->joinable()) {
+            cpp_thread->detach();
+        }
+    } catch (std::system_error &) {
+        // An error occurred when detaching the thread.  SDL_DetachThread does not,
+        // however, seem to provide a means to report errors to its callers
+        // though!
+    }
+}
+
+extern "C" SDL_TLSData *
+SDL_SYS_GetTLSData(void)
+{
+    return SDL_Generic_GetTLSData();
+}
+
+extern "C" int
+SDL_SYS_SetTLSData(SDL_TLSData *data)
+{
+    return SDL_Generic_SetTLSData(data);
+}

external/sdl/SDL/src/thread/stdcpp/SDL_systhread_c.h

@@ -0,0 +1,24 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+/* For a thread handle, use a void pointer to a std::thread */
+typedef void *SYS_ThreadHandle;

external/sdl/SDL/src/thread/vita/SDL_syscond.c

@@ -0,0 +1,204 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_VITA
+
+/* An implementation of condition variables using semaphores and mutexes */
+/*
+   This implementation borrows heavily from the BeOS condition variable
+   implementation, written by Christopher Tate and Owen Smith.  Thanks!
+ */
+
+struct SDL_Condition
+{
+    SDL_Mutex *lock;
+    int waiting;
+    int signals;
+    SDL_Semaphore *wait_sem;
+    SDL_Semaphore *wait_done;
+};
+
+/* Create a condition variable */
+SDL_Condition *SDL_CreateCondition(void)
+{
+    SDL_Condition *cond;
+
+    cond = (SDL_Condition *)SDL_malloc(sizeof(SDL_Condition));
+    if (cond != NULL) {
+        cond->lock = SDL_CreateMutex();
+        cond->wait_sem = SDL_CreateSemaphore(0);
+        cond->wait_done = SDL_CreateSemaphore(0);
+        cond->waiting = cond->signals = 0;
+        if (!cond->lock || !cond->wait_sem || !cond->wait_done) {
+            SDL_DestroyCondition(cond);
+            cond = NULL;
+        }
+    } else {
+        SDL_OutOfMemory();
+    }
+    return cond;
+}
+
+/* Destroy a condition variable */
+void SDL_DestroyCondition(SDL_Condition *cond)
+{
+    if (cond != NULL) {
+        if (cond->wait_sem) {
+            SDL_DestroySemaphore(cond->wait_sem);
+        }
+        if (cond->wait_done) {
+            SDL_DestroySemaphore(cond->wait_done);
+        }
+        if (cond->lock) {
+            SDL_DestroyMutex(cond->lock);
+        }
+        SDL_free(cond);
+    }
+}
+
+/* Restart one of the threads that are waiting on the condition variable */
+int SDL_SignalCondition(SDL_Condition *cond)
+{
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+
+    /* If there are waiting threads not already signalled, then
+       signal the condition and wait for the thread to respond.
+     */
+    SDL_LockMutex(cond->lock);
+    if (cond->waiting > cond->signals) {
+        ++cond->signals;
+        SDL_PostSemaphore(cond->wait_sem);
+        SDL_UnlockMutex(cond->lock);
+        SDL_WaitSemaphore(cond->wait_done);
+    } else {
+        SDL_UnlockMutex(cond->lock);
+    }
+
+    return 0;
+}
+
+/* Restart all threads that are waiting on the condition variable */
+int SDL_BroadcastCondition(SDL_Condition *cond)
+{
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+
+    /* If there are waiting threads not already signalled, then
+       signal the condition and wait for the thread to respond.
+     */
+    SDL_LockMutex(cond->lock);
+    if (cond->waiting > cond->signals) {
+        int i, num_waiting;
+
+        num_waiting = (cond->waiting - cond->signals);
+        cond->signals = cond->waiting;
+        for (i = 0; i < num_waiting; ++i) {
+            SDL_PostSemaphore(cond->wait_sem);
+        }
+        /* Now all released threads are blocked here, waiting for us.
+           Collect them all (and win fabulous prizes!) :-)
+         */
+        SDL_UnlockMutex(cond->lock);
+        for (i = 0; i < num_waiting; ++i) {
+            SDL_WaitSemaphore(cond->wait_done);
+        }
+    } else {
+        SDL_UnlockMutex(cond->lock);
+    }
+
+    return 0;
+}
+
+/* Wait on the condition variable for at most 'timeoutNS' nanoseconds.
+   The mutex must be locked before entering this function!
+   The mutex is unlocked during the wait, and locked again after the wait.
+
+Typical use:
+
+Thread A:
+    SDL_LockMutex(lock);
+    while ( ! condition ) {
+        SDL_WaitCondition(cond, lock);
+    }
+    SDL_UnlockMutex(lock);
+
+Thread B:
+    SDL_LockMutex(lock);
+    ...
+    condition = true;
+    ...
+    SDL_SignalCondition(cond);
+    SDL_UnlockMutex(lock);
+ */
+int SDL_WaitConditionTimeoutNS(SDL_Condition *cond, SDL_Mutex *mutex, Sint64 timeoutNS)
+{
+    int retval;
+
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+
+    /* Obtain the protection mutex, and increment the number of waiters.
+       This allows the signal mechanism to only perform a signal if there
+       are waiting threads.
+     */
+    SDL_LockMutex(cond->lock);
+    ++cond->waiting;
+    SDL_UnlockMutex(cond->lock);
+
+    /* Unlock the mutex, as is required by condition variable semantics */
+    SDL_UnlockMutex(mutex);
+
+    /* Wait for a signal */
+    retval = SDL_WaitSemaphoreTimeoutNS(cond->wait_sem, timeoutNS);
+
+    /* Let the signaler know we have completed the wait, otherwise
+       the signaler can race ahead and get the condition semaphore
+       if we are stopped between the mutex unlock and semaphore wait,
+       giving a deadlock.  See the following URL for details:
+       http://www-classic.be.com/aboutbe/benewsletter/volume_III/Issue40.html
+     */
+    SDL_LockMutex(cond->lock);
+    if (cond->signals > 0) {
+        /* If we timed out, we need to eat a condition signal */
+        if (retval > 0) {
+            SDL_WaitSemaphore(cond->wait_sem);
+        }
+        /* We always notify the signal thread that we are done */
+        SDL_PostSemaphore(cond->wait_done);
+
+        /* Signal handshake complete */
+        --cond->signals;
+    }
+    --cond->waiting;
+    SDL_UnlockMutex(cond->lock);
+
+    /* Lock the mutex, as is required by condition variable semantics */
+    SDL_LockMutex(mutex);
+
+    return retval;
+}
+
+#endif /* SDL_THREAD_VITA */

external/sdl/SDL/src/thread/vita/SDL_sysmutex.c

@@ -0,0 +1,141 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_VITA
+
+#include "SDL_systhread_c.h"
+
+#include <psp2/kernel/threadmgr.h>
+#include <psp2/kernel/error.h>
+
+struct SDL_Mutex
+{
+    SceKernelLwMutexWork lock;
+};
+
+/* Create a mutex */
+SDL_Mutex *SDL_CreateMutex(void)
+{
+    SDL_Mutex *mutex = NULL;
+    SceInt32 res = 0;
+
+    /* Allocate mutex memory */
+    mutex = (SDL_Mutex *)SDL_malloc(sizeof(*mutex));
+    if (mutex != NULL) {
+
+        res = sceKernelCreateLwMutex(
+            &mutex->lock,
+            "SDL mutex",
+            SCE_KERNEL_MUTEX_ATTR_RECURSIVE,
+            0,
+            NULL);
+
+        if (res < 0) {
+            SDL_SetError("Error trying to create mutex: %x", res);
+        }
+    } else {
+        SDL_OutOfMemory();
+    }
+    return mutex;
+}
+
+/* Free the mutex */
+void SDL_DestroyMutex(SDL_Mutex *mutex)
+{
+    if (mutex != NULL) {
+        sceKernelDeleteLwMutex(&mutex->lock);
+        SDL_free(mutex);
+    }
+}
+
+/* Lock the mutex */
+int SDL_LockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+#ifdef SDL_THREADS_DISABLED
+    return 0;
+#else
+    SceInt32 res = 0;
+
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    res = sceKernelLockLwMutex(&mutex->lock, 1, NULL);
+    if (res != SCE_KERNEL_OK) {
+        return SDL_SetError("Error trying to lock mutex: %x", res);
+    }
+
+    return 0;
+#endif /* SDL_THREADS_DISABLED */
+}
+
+/* Try to lock the mutex */
+int SDL_TryLockMutex(SDL_Mutex *mutex)
+{
+#ifdef SDL_THREADS_DISABLED
+    return 0;
+#else
+    SceInt32 res = 0;
+
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    res = sceKernelTryLockLwMutex(&mutex->lock, 1);
+    switch (res) {
+    case SCE_KERNEL_OK:
+        return 0;
+        break;
+    case SCE_KERNEL_ERROR_MUTEX_FAILED_TO_OWN:
+        return SDL_MUTEX_TIMEDOUT;
+        break;
+    default:
+        return SDL_SetError("Error trying to lock mutex: %x", res);
+        break;
+    }
+
+    return -1;
+#endif /* SDL_THREADS_DISABLED */
+}
+
+/* Unlock the mutex */
+int SDL_UnlockMutex(SDL_Mutex *mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+#ifdef SDL_THREADS_DISABLED
+    return 0;
+#else
+    SceInt32 res = 0;
+
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    res = sceKernelUnlockLwMutex(&mutex->lock, 1);
+    if (res != 0) {
+        return SDL_SetError("Error trying to unlock mutex: %x", res);
+    }
+
+    return 0;
+#endif /* SDL_THREADS_DISABLED */
+}
+
+#endif /* SDL_THREAD_VITA */

external/sdl/SDL/src/thread/vita/SDL_sysmutex_c.h

@@ -0,0 +1,21 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"

external/sdl/SDL/src/thread/vita/SDL_syssem.c

@@ -0,0 +1,147 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_VITA
+
+/* Semaphore functions for the VITA. */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <psp2/types.h>
+#include <psp2/kernel/error.h>
+#include <psp2/kernel/threadmgr.h>
+
+struct SDL_Semaphore
+{
+    SceUID semid;
+};
+
+/* Create a semaphore */
+SDL_Semaphore *SDL_CreateSemaphore(Uint32 initial_value)
+{
+    SDL_Semaphore *sem;
+
+    sem = (SDL_Semaphore *)SDL_malloc(sizeof(*sem));
+    if (sem != NULL) {
+        /* TODO: Figure out the limit on the maximum value. */
+        sem->semid = sceKernelCreateSema("SDL sema", 0, initial_value, 255, NULL);
+        if (sem->semid < 0) {
+            SDL_SetError("Couldn't create semaphore");
+            SDL_free(sem);
+            sem = NULL;
+        }
+    } else {
+        SDL_OutOfMemory();
+    }
+
+    return sem;
+}
+
+/* Free the semaphore */
+void SDL_DestroySemaphore(SDL_Semaphore *sem)
+{
+    if (sem != NULL) {
+        if (sem->semid > 0) {
+            sceKernelDeleteSema(sem->semid);
+            sem->semid = 0;
+        }
+
+        SDL_free(sem);
+    }
+}
+
+/* TODO: This routine is a bit overloaded.
+ * If the timeout is 0 then just poll the semaphore; if it's SDL_MUTEX_MAXWAIT, pass
+ * NULL to sceKernelWaitSema() so that it waits indefinitely; and if the timeout
+ * is specified, convert it to microseconds. */
+int SDL_WaitSemaphoreTimeoutNS(SDL_Semaphore *sem, Sint64 timeoutNS)
+{
+    SceUInt timeoutUS;
+    SceUInt *pTimeout;
+    int res;
+
+    if (sem == NULL) {
+        return SDL_InvalidParamError("sem");
+    }
+
+    if (timeoutNS == 0) {
+        res = sceKernelPollSema(sem->semid, 1);
+        if (res < 0) {
+            return SDL_MUTEX_TIMEDOUT;
+        }
+        return 0;
+    }
+
+    if (timeoutNS < 0) {
+        pTimeout = NULL;
+    } else {
+        timeoutUS = (SceUInt)SDL_NS_TO_US(timeoutNS); /* Convert to microseconds. */
+        pTimeout = &timeoutUS;
+    }
+
+    res = sceKernelWaitSema(sem->semid, 1, pTimeout);
+    switch (res) {
+    case SCE_KERNEL_OK:
+        return 0;
+    case SCE_KERNEL_ERROR_WAIT_TIMEOUT:
+        return SDL_MUTEX_TIMEDOUT;
+    default:
+        return SDL_SetError("sceKernelWaitSema() failed");
+    }
+}
+
+/* Returns the current count of the semaphore */
+Uint32 SDL_GetSemaphoreValue(SDL_Semaphore *sem)
+{
+    SceKernelSemaInfo info;
+    info.size = sizeof(info);
+
+    if (sem == NULL) {
+        SDL_InvalidParamError("sem");
+        return 0;
+    }
+
+    if (sceKernelGetSemaInfo(sem->semid, &info) >= 0) {
+        return info.currentCount;
+    }
+
+    return 0;
+}
+
+int SDL_PostSemaphore(SDL_Semaphore *sem)
+{
+    int res;
+
+    if (sem == NULL) {
+        return SDL_InvalidParamError("sem");
+    }
+
+    res = sceKernelSignalSema(sem->semid, 1);
+    if (res < 0) {
+        return SDL_SetError("sceKernelSignalSema() failed");
+    }
+
+    return 0;
+}
+
+#endif /* SDL_THREAD_VITA */

external/sdl/SDL/src/thread/vita/SDL_systhread.c

@@ -0,0 +1,133 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_VITA
+
+/* VITA thread management routines for SDL */
+
+#include <stdio.h>
+#include <stdlib.h>
+
+#include "../SDL_systhread.h"
+#include "../SDL_thread_c.h"
+#include <psp2/types.h>
+#include <psp2/kernel/threadmgr.h>
+
+#define VITA_THREAD_STACK_SIZE_MIN     0x1000    // 4KiB
+#define VITA_THREAD_STACK_SIZE_MAX     0x2000000 // 32MiB
+#define VITA_THREAD_STACK_SIZE_DEFAULT 0x10000   // 64KiB
+#define VITA_THREAD_NAME_MAX           32
+
+#define VITA_THREAD_PRIORITY_LOW           191
+#define VITA_THREAD_PRIORITY_NORMAL        160
+#define VITA_THREAD_PRIORITY_HIGH          112
+#define VITA_THREAD_PRIORITY_TIME_CRITICAL 64
+
+static int ThreadEntry(SceSize args, void *argp)
+{
+    SDL_RunThread(*(SDL_Thread **)argp);
+    return 0;
+}
+
+int SDL_SYS_CreateThread(SDL_Thread *thread)
+{
+    char thread_name[VITA_THREAD_NAME_MAX];
+    size_t stack_size = VITA_THREAD_STACK_SIZE_DEFAULT;
+
+    SDL_strlcpy(thread_name, "SDL thread", VITA_THREAD_NAME_MAX);
+    if (thread->name) {
+        SDL_strlcpy(thread_name, thread->name, VITA_THREAD_NAME_MAX);
+    }
+
+    if (thread->stacksize) {
+        if (thread->stacksize < VITA_THREAD_STACK_SIZE_MIN) {
+            thread->stacksize = VITA_THREAD_STACK_SIZE_MIN;
+        }
+        if (thread->stacksize > VITA_THREAD_STACK_SIZE_MAX) {
+            thread->stacksize = VITA_THREAD_STACK_SIZE_MAX;
+        }
+        stack_size = thread->stacksize;
+    }
+
+    /* Create new thread with the same priority as the current thread */
+    thread->handle = sceKernelCreateThread(
+        thread_name, // name
+        ThreadEntry, // function to run
+        0,           // priority. 0 means priority of calling thread
+        stack_size,  // stack size
+        0,           // attributes. always 0
+        0,           // cpu affinity mask. 0 = all CPUs
+        NULL         // opt. always NULL
+    );
+
+    if (thread->handle < 0) {
+        return SDL_SetError("sceKernelCreateThread() failed");
+    }
+
+    sceKernelStartThread(thread->handle, 4, &thread);
+    return 0;
+}
+
+void SDL_SYS_SetupThread(const char *name)
+{
+    /* Do nothing. */
+}
+
+SDL_threadID SDL_ThreadID(void)
+{
+    return (SDL_threadID)sceKernelGetThreadId();
+}
+
+void SDL_SYS_WaitThread(SDL_Thread *thread)
+{
+    sceKernelWaitThreadEnd(thread->handle, NULL, NULL);
+    sceKernelDeleteThread(thread->handle);
+}
+
+void SDL_SYS_DetachThread(SDL_Thread *thread)
+{
+    /* Do nothing. */
+}
+
+int SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
+{
+    int value = VITA_THREAD_PRIORITY_NORMAL;
+
+    switch (priority) {
+    case SDL_THREAD_PRIORITY_LOW:
+        value = VITA_THREAD_PRIORITY_LOW;
+        break;
+    case SDL_THREAD_PRIORITY_NORMAL:
+        value = VITA_THREAD_PRIORITY_NORMAL;
+        break;
+    case SDL_THREAD_PRIORITY_HIGH:
+        value = VITA_THREAD_PRIORITY_HIGH;
+        break;
+    case SDL_THREAD_PRIORITY_TIME_CRITICAL:
+        value = VITA_THREAD_PRIORITY_TIME_CRITICAL;
+        break;
+    }
+
+    return sceKernelChangeThreadPriority(0, value);
+}
+
+#endif /* SDL_THREAD_VITA */

external/sdl/SDL/src/thread/vita/SDL_systhread_c.h

@@ -0,0 +1,24 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include <psp2/types.h>
+
+typedef SceUID SYS_ThreadHandle;

external/sdl/SDL/src/thread/windows/SDL_syscond_cv.c

@@ -0,0 +1,269 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#include "../generic/SDL_syscond_c.h"
+#include "SDL_sysmutex_c.h"
+
+typedef SDL_Condition *(*pfnSDL_CreateCondition)(void);
+typedef void (*pfnSDL_DestroyCondition)(SDL_Condition *);
+typedef int (*pfnSDL_SignalCondition)(SDL_Condition *);
+typedef int (*pfnSDL_BroadcastCondition)(SDL_Condition *);
+typedef int (*pfnSDL_WaitConditionTimeoutNS)(SDL_Condition *, SDL_Mutex *, Sint64);
+
+typedef struct SDL_cond_impl_t
+{
+    pfnSDL_CreateCondition Create;
+    pfnSDL_DestroyCondition Destroy;
+    pfnSDL_SignalCondition Signal;
+    pfnSDL_BroadcastCondition Broadcast;
+    pfnSDL_WaitConditionTimeoutNS WaitTimeoutNS;
+} SDL_cond_impl_t;
+
+/* Implementation will be chosen at runtime based on available Kernel features */
+static SDL_cond_impl_t SDL_cond_impl_active = { 0 };
+
+/**
+ * Native Windows Condition Variable (SRW Locks)
+ */
+
+#ifndef CONDITION_VARIABLE_INIT
+#define CONDITION_VARIABLE_INIT \
+    {                           \
+        0                       \
+    }
+typedef struct CONDITION_VARIABLE
+{
+    PVOID Ptr;
+} CONDITION_VARIABLE, *PCONDITION_VARIABLE;
+#endif
+
+#ifdef __WINRT__
+#define pWakeConditionVariable     WakeConditionVariable
+#define pWakeAllConditionVariable  WakeAllConditionVariable
+#define pSleepConditionVariableSRW SleepConditionVariableSRW
+#define pSleepConditionVariableCS  SleepConditionVariableCS
+#else
+typedef VOID(WINAPI *pfnWakeConditionVariable)(PCONDITION_VARIABLE);
+typedef VOID(WINAPI *pfnWakeAllConditionVariable)(PCONDITION_VARIABLE);
+typedef BOOL(WINAPI *pfnSleepConditionVariableSRW)(PCONDITION_VARIABLE, PSRWLOCK, DWORD, ULONG);
+typedef BOOL(WINAPI *pfnSleepConditionVariableCS)(PCONDITION_VARIABLE, PCRITICAL_SECTION, DWORD);
+
+static pfnWakeConditionVariable pWakeConditionVariable = NULL;
+static pfnWakeAllConditionVariable pWakeAllConditionVariable = NULL;
+static pfnSleepConditionVariableSRW pSleepConditionVariableSRW = NULL;
+static pfnSleepConditionVariableCS pSleepConditionVariableCS = NULL;
+#endif
+
+typedef struct SDL_cond_cv
+{
+    CONDITION_VARIABLE cond;
+} SDL_cond_cv;
+
+static SDL_Condition *SDL_CreateCondition_cv(void)
+{
+    SDL_cond_cv *cond;
+
+    /* Relies on CONDITION_VARIABLE_INIT == 0. */
+    cond = (SDL_cond_cv *)SDL_calloc(1, sizeof(*cond));
+    if (cond == NULL) {
+        SDL_OutOfMemory();
+    }
+
+    return (SDL_Condition *)cond;
+}
+
+static void SDL_DestroyCondition_cv(SDL_Condition *cond)
+{
+    if (cond != NULL) {
+        /* There are no kernel allocated resources */
+        SDL_free(cond);
+    }
+}
+
+static int SDL_SignalCondition_cv(SDL_Condition *_cond)
+{
+    SDL_cond_cv *cond = (SDL_cond_cv *)_cond;
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+
+    pWakeConditionVariable(&cond->cond);
+
+    return 0;
+}
+
+static int SDL_BroadcastCondition_cv(SDL_Condition *_cond)
+{
+    SDL_cond_cv *cond = (SDL_cond_cv *)_cond;
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+
+    pWakeAllConditionVariable(&cond->cond);
+
+    return 0;
+}
+
+static int SDL_WaitConditionTimeoutNS_cv(SDL_Condition *_cond, SDL_Mutex *_mutex, Sint64 timeoutNS)
+{
+    SDL_cond_cv *cond = (SDL_cond_cv *)_cond;
+    DWORD timeout;
+    int ret;
+
+    if (cond == NULL) {
+        return SDL_InvalidParamError("cond");
+    }
+    if (_mutex == NULL) {
+        return SDL_InvalidParamError("mutex");
+    }
+
+    if (timeoutNS < 0) {
+        timeout = INFINITE;
+    } else {
+        timeout = (DWORD)SDL_NS_TO_MS(timeoutNS);
+    }
+
+    if (SDL_mutex_impl_active.Type == SDL_MUTEX_SRW) {
+        SDL_mutex_srw *mutex = (SDL_mutex_srw *)_mutex;
+
+        if (mutex->count != 1 || mutex->owner != GetCurrentThreadId()) {
+            return SDL_SetError("Passed mutex is not locked or locked recursively");
+        }
+
+        /* The mutex must be updated to the released state */
+        mutex->count = 0;
+        mutex->owner = 0;
+
+        if (pSleepConditionVariableSRW(&cond->cond, &mutex->srw, timeout, 0) == FALSE) {
+            if (GetLastError() == ERROR_TIMEOUT) {
+                ret = SDL_MUTEX_TIMEDOUT;
+            } else {
+                ret = SDL_SetError("SleepConditionVariableSRW() failed");
+            }
+        } else {
+            ret = 0;
+        }
+
+        /* The mutex is owned by us again, regardless of status of the wait */
+        SDL_assert(mutex->count == 0 && mutex->owner == 0);
+        mutex->count = 1;
+        mutex->owner = GetCurrentThreadId();
+    } else {
+        SDL_mutex_cs *mutex = (SDL_mutex_cs *)_mutex;
+
+        SDL_assert(SDL_mutex_impl_active.Type == SDL_MUTEX_CS);
+
+        if (pSleepConditionVariableCS(&cond->cond, &mutex->cs, timeout) == FALSE) {
+            if (GetLastError() == ERROR_TIMEOUT) {
+                ret = SDL_MUTEX_TIMEDOUT;
+            } else {
+                ret = SDL_SetError("SleepConditionVariableCS() failed");
+            }
+        } else {
+            ret = 0;
+        }
+    }
+
+    return ret;
+}
+
+static const SDL_cond_impl_t SDL_cond_impl_cv = {
+    &SDL_CreateCondition_cv,
+    &SDL_DestroyCondition_cv,
+    &SDL_SignalCondition_cv,
+    &SDL_BroadcastCondition_cv,
+    &SDL_WaitConditionTimeoutNS_cv,
+};
+
+
+#ifndef __WINRT__
+/* Generic Condition Variable implementation using SDL_Mutex and SDL_Semaphore */
+static const SDL_cond_impl_t SDL_cond_impl_generic = {
+    &SDL_CreateCondition_generic,
+    &SDL_DestroyCondition_generic,
+    &SDL_SignalCondition_generic,
+    &SDL_BroadcastCondition_generic,
+    &SDL_WaitConditionTimeoutNS_generic,
+};
+#endif
+
+SDL_Condition *SDL_CreateCondition(void)
+{
+    if (SDL_cond_impl_active.Create == NULL) {
+        const SDL_cond_impl_t *impl = NULL;
+
+        if (SDL_mutex_impl_active.Type == SDL_MUTEX_INVALID) {
+            /* The mutex implementation isn't decided yet, trigger it */
+            SDL_Mutex *mutex = SDL_CreateMutex();
+            if (mutex == NULL) {
+                return NULL;
+            }
+            SDL_DestroyMutex(mutex);
+
+            SDL_assert(SDL_mutex_impl_active.Type != SDL_MUTEX_INVALID);
+        }
+
+#ifdef __WINRT__
+        /* Link statically on this platform */
+        impl = &SDL_cond_impl_cv;
+#else
+        /* Default to generic implementation, works with all mutex implementations */
+        impl = &SDL_cond_impl_generic;
+        {
+            HMODULE kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
+            if (kernel32) {
+                pWakeConditionVariable = (pfnWakeConditionVariable)GetProcAddress(kernel32, "WakeConditionVariable");
+                pWakeAllConditionVariable = (pfnWakeAllConditionVariable)GetProcAddress(kernel32, "WakeAllConditionVariable");
+                pSleepConditionVariableSRW = (pfnSleepConditionVariableSRW)GetProcAddress(kernel32, "SleepConditionVariableSRW");
+                pSleepConditionVariableCS = (pfnSleepConditionVariableCS)GetProcAddress(kernel32, "SleepConditionVariableCS");
+                if (pWakeConditionVariable && pWakeAllConditionVariable && pSleepConditionVariableSRW && pSleepConditionVariableCS) {
+                    /* Use the Windows provided API */
+                    impl = &SDL_cond_impl_cv;
+                }
+            }
+        }
+#endif
+
+        SDL_copyp(&SDL_cond_impl_active, impl);
+    }
+    return SDL_cond_impl_active.Create();
+}
+
+void SDL_DestroyCondition(SDL_Condition *cond)
+{
+    SDL_cond_impl_active.Destroy(cond);
+}
+
+int SDL_SignalCondition(SDL_Condition *cond)
+{
+    return SDL_cond_impl_active.Signal(cond);
+}
+
+int SDL_BroadcastCondition(SDL_Condition *cond)
+{
+    return SDL_cond_impl_active.Broadcast(cond);
+}
+
+int SDL_WaitConditionTimeoutNS(SDL_Condition *cond, SDL_Mutex *mutex, Sint64 timeoutNS)
+{
+    return SDL_cond_impl_active.WaitTimeoutNS(cond, mutex, timeoutNS);
+}

external/sdl/SDL/src/thread/windows/SDL_sysmutex.c

@@ -0,0 +1,290 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_WINDOWS
+
+/**
+ * Mutex functions using the Win32 API
+ * There are two implementations available based on:
+ * - Critical Sections. Available on all OS versions since Windows XP.
+ * - Slim Reader/Writer Locks. Requires Windows 7 or newer.
+ * which are chosen at runtime.
+ */
+
+#include "SDL_sysmutex_c.h"
+
+/* Implementation will be chosen at runtime based on available Kernel features */
+SDL_mutex_impl_t SDL_mutex_impl_active = { 0 };
+
+/**
+ * Implementation based on Slim Reader/Writer (SRW) Locks for Win 7 and newer.
+ */
+
+#ifdef __WINRT__
+/* Functions are guaranteed to be available */
+#define pInitializeSRWLock InitializeSRWLock
+#define pReleaseSRWLockExclusive    ReleaseSRWLockExclusive
+#define pAcquireSRWLockExclusive    AcquireSRWLockExclusive
+#define pTryAcquireSRWLockExclusive TryAcquireSRWLockExclusive
+#else
+typedef VOID(WINAPI *pfnInitializeSRWLock)(PSRWLOCK);
+typedef VOID(WINAPI *pfnReleaseSRWLockExclusive)(PSRWLOCK);
+typedef VOID(WINAPI *pfnAcquireSRWLockExclusive)(PSRWLOCK);
+typedef BOOLEAN(WINAPI *pfnTryAcquireSRWLockExclusive)(PSRWLOCK);
+static pfnInitializeSRWLock pInitializeSRWLock = NULL;
+static pfnReleaseSRWLockExclusive pReleaseSRWLockExclusive = NULL;
+static pfnAcquireSRWLockExclusive pAcquireSRWLockExclusive = NULL;
+static pfnTryAcquireSRWLockExclusive pTryAcquireSRWLockExclusive = NULL;
+#endif
+
+static SDL_Mutex *SDL_CreateMutex_srw(void)
+{
+    SDL_mutex_srw *mutex;
+
+    mutex = (SDL_mutex_srw *)SDL_calloc(1, sizeof(*mutex));
+    if (mutex == NULL) {
+        SDL_OutOfMemory();
+    }
+
+    pInitializeSRWLock(&mutex->srw);
+
+    return (SDL_Mutex *)mutex;
+}
+
+static void SDL_DestroyMutex_srw(SDL_Mutex *mutex)
+{
+    /* There are no kernel allocated resources */
+    SDL_free(mutex);
+}
+
+static int SDL_LockMutex_srw(SDL_Mutex *_mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    SDL_mutex_srw *mutex = (SDL_mutex_srw *)_mutex;
+    DWORD this_thread;
+
+    this_thread = GetCurrentThreadId();
+    if (mutex->owner == this_thread) {
+        ++mutex->count;
+    } else {
+        /* The order of operations is important.
+           We set the locking thread id after we obtain the lock
+           so unlocks from other threads will fail.
+         */
+        pAcquireSRWLockExclusive(&mutex->srw);
+        SDL_assert(mutex->count == 0 && mutex->owner == 0);
+        mutex->owner = this_thread;
+        mutex->count = 1;
+    }
+    return 0;
+}
+
+static int SDL_TryLockMutex_srw(SDL_Mutex *_mutex)
+{
+    SDL_mutex_srw *mutex = (SDL_mutex_srw *)_mutex;
+    DWORD this_thread;
+    int retval = 0;
+
+    this_thread = GetCurrentThreadId();
+    if (mutex->owner == this_thread) {
+        ++mutex->count;
+    } else {
+        if (pTryAcquireSRWLockExclusive(&mutex->srw) != 0) {
+            SDL_assert(mutex->count == 0 && mutex->owner == 0);
+            mutex->owner = this_thread;
+            mutex->count = 1;
+        } else {
+            retval = SDL_MUTEX_TIMEDOUT;
+        }
+    }
+    return retval;
+}
+
+static int SDL_UnlockMutex_srw(SDL_Mutex *_mutex) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    SDL_mutex_srw *mutex = (SDL_mutex_srw *)_mutex;
+
+    if (mutex->owner == GetCurrentThreadId()) {
+        if (--mutex->count == 0) {
+            mutex->owner = 0;
+            pReleaseSRWLockExclusive(&mutex->srw);
+        }
+    } else {
+        return SDL_SetError("mutex not owned by this thread");
+    }
+
+    return 0;
+}
+
+static const SDL_mutex_impl_t SDL_mutex_impl_srw = {
+    &SDL_CreateMutex_srw,
+    &SDL_DestroyMutex_srw,
+    &SDL_LockMutex_srw,
+    &SDL_TryLockMutex_srw,
+    &SDL_UnlockMutex_srw,
+    SDL_MUTEX_SRW,
+};
+
+/**
+ * Fallback Mutex implementation using Critical Sections (before Win 7)
+ */
+
+/* Create a mutex */
+static SDL_Mutex *SDL_CreateMutex_cs(void)
+{
+    SDL_mutex_cs *mutex;
+
+    /* Allocate mutex memory */
+    mutex = (SDL_mutex_cs *)SDL_malloc(sizeof(*mutex));
+    if (mutex != NULL) {
+        /* Initialize */
+        /* On SMP systems, a non-zero spin count generally helps performance */
+#ifdef __WINRT__
+        InitializeCriticalSectionEx(&mutex->cs, 2000, 0);
+#else
+        InitializeCriticalSectionAndSpinCount(&mutex->cs, 2000);
+#endif
+    } else {
+        SDL_OutOfMemory();
+    }
+    return (SDL_Mutex *)mutex;
+}
+
+/* Free the mutex */
+static void SDL_DestroyMutex_cs(SDL_Mutex *mutex_)
+{
+    SDL_mutex_cs *mutex = (SDL_mutex_cs *)mutex_;
+
+    DeleteCriticalSection(&mutex->cs);
+    SDL_free(mutex);
+}
+
+/* Lock the mutex */
+static int SDL_LockMutex_cs(SDL_Mutex *mutex_) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    SDL_mutex_cs *mutex = (SDL_mutex_cs *)mutex_;
+
+    EnterCriticalSection(&mutex->cs);
+    return 0;
+}
+
+/* TryLock the mutex */
+static int SDL_TryLockMutex_cs(SDL_Mutex *mutex_)
+{
+    SDL_mutex_cs *mutex = (SDL_mutex_cs *)mutex_;
+    int retval = 0;
+
+    if (TryEnterCriticalSection(&mutex->cs) == 0) {
+        retval = SDL_MUTEX_TIMEDOUT;
+    }
+    return retval;
+}
+
+/* Unlock the mutex */
+static int SDL_UnlockMutex_cs(SDL_Mutex *mutex_) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    SDL_mutex_cs *mutex = (SDL_mutex_cs *)mutex_;
+
+    LeaveCriticalSection(&mutex->cs);
+    return 0;
+}
+
+static const SDL_mutex_impl_t SDL_mutex_impl_cs = {
+    &SDL_CreateMutex_cs,
+    &SDL_DestroyMutex_cs,
+    &SDL_LockMutex_cs,
+    &SDL_TryLockMutex_cs,
+    &SDL_UnlockMutex_cs,
+    SDL_MUTEX_CS,
+};
+
+/**
+ * Runtime selection and redirection
+ */
+
+SDL_Mutex *SDL_CreateMutex(void)
+{
+    if (SDL_mutex_impl_active.Create == NULL) {
+        /* Default to fallback implementation */
+        const SDL_mutex_impl_t *impl = &SDL_mutex_impl_cs;
+
+        if (!SDL_GetHintBoolean(SDL_HINT_WINDOWS_FORCE_MUTEX_CRITICAL_SECTIONS, SDL_FALSE)) {
+#ifdef __WINRT__
+            /* Link statically on this platform */
+            impl = &SDL_mutex_impl_srw;
+#else
+            /* Try faster implementation for Windows 7 and newer */
+            HMODULE kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
+            if (kernel32) {
+                /* Requires Vista: */
+                pInitializeSRWLock = (pfnInitializeSRWLock)GetProcAddress(kernel32, "InitializeSRWLock");
+                pReleaseSRWLockExclusive = (pfnReleaseSRWLockExclusive)GetProcAddress(kernel32, "ReleaseSRWLockExclusive");
+                pAcquireSRWLockExclusive = (pfnAcquireSRWLockExclusive)GetProcAddress(kernel32, "AcquireSRWLockExclusive");
+                /* Requires 7: */
+                pTryAcquireSRWLockExclusive = (pfnTryAcquireSRWLockExclusive)GetProcAddress(kernel32, "TryAcquireSRWLockExclusive");
+                if (pInitializeSRWLock && pReleaseSRWLockExclusive && pAcquireSRWLockExclusive && pTryAcquireSRWLockExclusive) {
+                    impl = &SDL_mutex_impl_srw;
+                }
+            }
+#endif
+        }
+
+        /* Copy instead of using pointer to save one level of indirection */
+        SDL_copyp(&SDL_mutex_impl_active, impl);
+    }
+    return SDL_mutex_impl_active.Create();
+}
+
+void SDL_DestroyMutex(SDL_Mutex *mutex)
+{
+    if (mutex) {
+        SDL_mutex_impl_active.Destroy(mutex);
+    }
+}
+
+int SDL_LockMutex(SDL_Mutex *mutex)
+{
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    return SDL_mutex_impl_active.Lock(mutex);
+}
+
+int SDL_TryLockMutex(SDL_Mutex *mutex)
+{
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    return SDL_mutex_impl_active.TryLock(mutex);
+}
+
+int SDL_UnlockMutex(SDL_Mutex *mutex)
+{
+    if (mutex == NULL) {
+        return 0;
+    }
+
+    return SDL_mutex_impl_active.Unlock(mutex);
+}
+
+#endif /* SDL_THREAD_WINDOWS */

external/sdl/SDL/src/thread/windows/SDL_sysmutex_c.h

@@ -0,0 +1,73 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#include "../../core/windows/SDL_windows.h"
+
+typedef SDL_Mutex *(*pfnSDL_CreateMutex)(void);
+typedef int (*pfnSDL_LockMutex)(SDL_Mutex *);
+typedef int (*pfnSDL_TryLockMutex)(SDL_Mutex *);
+typedef int (*pfnSDL_UnlockMutex)(SDL_Mutex *);
+typedef void (*pfnSDL_DestroyMutex)(SDL_Mutex *);
+
+typedef enum
+{
+    SDL_MUTEX_INVALID = 0,
+    SDL_MUTEX_SRW,
+    SDL_MUTEX_CS,
+} SDL_MutexType;
+
+typedef struct SDL_mutex_impl_t
+{
+    pfnSDL_CreateMutex Create;
+    pfnSDL_DestroyMutex Destroy;
+    pfnSDL_LockMutex Lock;
+    pfnSDL_TryLockMutex TryLock;
+    pfnSDL_UnlockMutex Unlock;
+    /* Needed by SDL_Condition: */
+    SDL_MutexType Type;
+} SDL_mutex_impl_t;
+
+extern SDL_mutex_impl_t SDL_mutex_impl_active;
+
+#ifndef SRWLOCK_INIT
+#define SRWLOCK_INIT \
+    {                \
+        0            \
+    }
+typedef struct _SRWLOCK
+{
+    PVOID Ptr;
+} SRWLOCK, *PSRWLOCK;
+#endif
+
+typedef struct SDL_mutex_srw
+{
+    SRWLOCK srw;
+    /* SRW Locks are not recursive, that has to be handled by SDL: */
+    DWORD count;
+    DWORD owner;
+} SDL_mutex_srw;
+
+typedef struct SDL_mutex_cs
+{
+    CRITICAL_SECTION cs;
+} SDL_mutex_cs;

external/sdl/SDL/src/thread/windows/SDL_sysrwlock_srw.c

@@ -0,0 +1,258 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+/**
+ * Implementation based on Slim Reader/Writer (SRW) Locks for Win 7 and newer.
+ */
+
+/* This header makes sure SRWLOCK is actually declared, even on ancient WinSDKs. */
+#include "SDL_sysmutex_c.h"
+
+typedef VOID(WINAPI *pfnInitializeSRWLock)(PSRWLOCK);
+typedef VOID(WINAPI *pfnReleaseSRWLockShared)(PSRWLOCK);
+typedef VOID(WINAPI *pfnAcquireSRWLockShared)(PSRWLOCK);
+typedef BOOLEAN(WINAPI *pfnTryAcquireSRWLockShared)(PSRWLOCK);
+typedef VOID(WINAPI *pfnReleaseSRWLockExclusive)(PSRWLOCK);
+typedef VOID(WINAPI *pfnAcquireSRWLockExclusive)(PSRWLOCK);
+typedef BOOLEAN(WINAPI *pfnTryAcquireSRWLockExclusive)(PSRWLOCK);
+
+#ifdef __WINRT__
+/* Functions are guaranteed to be available */
+#define pTryAcquireSRWLockExclusive TryAcquireSRWLockExclusive
+#define pInitializeSRWLock InitializeSRWLock
+#define pReleaseSRWLockShared ReleaseSRWLockShared
+#define pAcquireSRWLockShared AcquireSRWLockShared
+#define pTryAcquireSRWLockShared TryAcquireSRWLockShared
+#define pReleaseSRWLockExclusive ReleaseSRWLockExclusive
+#define pAcquireSRWLockExclusive AcquireSRWLockExclusive
+#define pTryAcquireSRWLockExclusive TryAcquireSRWLockExclusive
+#else
+static pfnInitializeSRWLock pInitializeSRWLock = NULL;
+static pfnReleaseSRWLockShared pReleaseSRWLockShared = NULL;
+static pfnAcquireSRWLockShared pAcquireSRWLockShared = NULL;
+static pfnTryAcquireSRWLockShared  pTryAcquireSRWLockShared = NULL;
+static pfnReleaseSRWLockExclusive pReleaseSRWLockExclusive = NULL;
+static pfnAcquireSRWLockExclusive pAcquireSRWLockExclusive = NULL;
+static pfnTryAcquireSRWLockExclusive pTryAcquireSRWLockExclusive = NULL;
+#endif
+
+typedef SDL_RWLock *(*pfnSDL_CreateRWLock)(void);
+typedef void (*pfnSDL_DestroyRWLock)(SDL_RWLock *);
+typedef int (*pfnSDL_LockRWLockForReading)(SDL_RWLock *);
+typedef int (*pfnSDL_LockRWLockForWriting)(SDL_RWLock *);
+typedef int (*pfnSDL_TryLockRWLockForReading)(SDL_RWLock *);
+typedef int (*pfnSDL_TryLockRWLockForWriting)(SDL_RWLock *);
+typedef int (*pfnSDL_UnlockRWLock)(SDL_RWLock *);
+
+typedef struct SDL_rwlock_impl_t
+{
+    pfnSDL_CreateRWLock Create;
+    pfnSDL_DestroyRWLock Destroy;
+    pfnSDL_LockRWLockForReading LockForReading;
+    pfnSDL_LockRWLockForWriting LockForWriting;
+    pfnSDL_TryLockRWLockForReading TryLockForReading;
+    pfnSDL_TryLockRWLockForWriting TryLockForWriting;
+    pfnSDL_UnlockRWLock Unlock;
+} SDL_rwlock_impl_t;
+
+/* Implementation will be chosen at runtime based on available Kernel features */
+static SDL_rwlock_impl_t SDL_rwlock_impl_active = { 0 };
+
+/* rwlock implementation using Win7+ slim read/write locks (SRWLOCK) */
+
+typedef struct SDL_rwlock_srw
+{
+    SRWLOCK srw;
+    SDL_threadID write_owner;
+} SDL_rwlock_srw;
+
+static SDL_RWLock *SDL_CreateRWLock_srw(void)
+{
+    SDL_rwlock_srw *rwlock = (SDL_rwlock_srw *)SDL_calloc(1, sizeof(*rwlock));
+    if (rwlock == NULL) {
+        SDL_OutOfMemory();
+    }
+    pInitializeSRWLock(&rwlock->srw);
+    return (SDL_RWLock *)rwlock;
+}
+
+static void SDL_DestroyRWLock_srw(SDL_RWLock *_rwlock)
+{
+    SDL_rwlock_srw *rwlock = (SDL_rwlock_srw *) _rwlock;
+    if (rwlock) {
+        /* There are no kernel allocated resources */
+        SDL_free(rwlock);
+    }
+}
+
+static int SDL_LockRWLockForReading_srw(SDL_RWLock *_rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    SDL_rwlock_srw *rwlock = (SDL_rwlock_srw *) _rwlock;
+    if (rwlock == NULL) {
+        return SDL_InvalidParamError("rwlock");
+    }
+    pAcquireSRWLockShared(&rwlock->srw);
+    return 0;
+}
+
+static int SDL_LockRWLockForWriting_srw(SDL_RWLock *_rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    SDL_rwlock_srw *rwlock = (SDL_rwlock_srw *) _rwlock;
+    if (rwlock == NULL) {
+        return SDL_InvalidParamError("rwlock");
+    }
+    pAcquireSRWLockExclusive(&rwlock->srw);
+    rwlock->write_owner = SDL_ThreadID();
+    return 0;
+}
+
+static int SDL_TryLockRWLockForReading_srw(SDL_RWLock *_rwlock)
+{
+    SDL_rwlock_srw *rwlock = (SDL_rwlock_srw *) _rwlock;
+    int retval = 0;
+
+    if (rwlock == NULL) {
+        retval = SDL_InvalidParamError("rwlock");
+    } else {
+        retval = pTryAcquireSRWLockShared(&rwlock->srw) ? 0 : SDL_RWLOCK_TIMEDOUT;
+    }
+    return retval;
+}
+
+static int SDL_TryLockRWLockForWriting_srw(SDL_RWLock *_rwlock)
+{
+    SDL_rwlock_srw *rwlock = (SDL_rwlock_srw *) _rwlock;
+    int retval = 0;
+
+    if (rwlock == NULL) {
+        retval = SDL_InvalidParamError("rwlock");
+    } else {
+        retval = pTryAcquireSRWLockExclusive(&rwlock->srw) ? 0 : SDL_RWLOCK_TIMEDOUT;
+    }
+    return retval;
+}
+
+static int SDL_UnlockRWLock_srw(SDL_RWLock *_rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    SDL_rwlock_srw *rwlock = (SDL_rwlock_srw *) _rwlock;
+    if (rwlock == NULL) {
+        return SDL_InvalidParamError("rwlock");
+    } else if (rwlock->write_owner == SDL_ThreadID()) {
+        rwlock->write_owner = 0;
+        pReleaseSRWLockExclusive(&rwlock->srw);
+    } else {
+        pReleaseSRWLockShared(&rwlock->srw);
+    }
+    return 0;
+}
+
+static const SDL_rwlock_impl_t SDL_rwlock_impl_srw = {
+    &SDL_CreateRWLock_srw,
+    &SDL_DestroyRWLock_srw,
+    &SDL_LockRWLockForReading_srw,
+    &SDL_LockRWLockForWriting_srw,
+    &SDL_TryLockRWLockForReading_srw,
+    &SDL_TryLockRWLockForWriting_srw,
+    &SDL_UnlockRWLock_srw
+};
+
+#ifndef __WINRT__
+
+#include "../generic/SDL_sysrwlock_c.h"
+
+/* Generic rwlock implementation using SDL_Mutex, SDL_Condition, and SDL_AtomicInt */
+static const SDL_rwlock_impl_t SDL_rwlock_impl_generic = {
+    &SDL_CreateRWLock_generic,
+    &SDL_DestroyRWLock_generic,
+    &SDL_LockRWLockForReading_generic,
+    &SDL_LockRWLockForWriting_generic,
+    &SDL_TryLockRWLockForReading_generic,
+    &SDL_TryLockRWLockForWriting_generic,
+    &SDL_UnlockRWLock_generic
+};
+#endif
+
+SDL_RWLock *SDL_CreateRWLock(void)
+{
+    if (SDL_rwlock_impl_active.Create == NULL) {
+        const SDL_rwlock_impl_t *impl;
+
+#ifdef __WINRT__
+        /* Link statically on this platform */
+        impl = &SDL_rwlock_impl_srw;
+#else
+        /* Default to generic implementation, works with all mutex implementations */
+        impl = &SDL_rwlock_impl_generic;
+        {
+            HMODULE kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
+            if (kernel32) {
+                SDL_bool okay = SDL_TRUE;
+                #define LOOKUP_SRW_SYM(sym) if (okay) { if ((p##sym = (pfn##sym)GetProcAddress(kernel32, #sym)) == NULL) { okay = SDL_FALSE; } }
+                LOOKUP_SRW_SYM(InitializeSRWLock);
+                LOOKUP_SRW_SYM(ReleaseSRWLockShared);
+                LOOKUP_SRW_SYM(AcquireSRWLockShared);
+                LOOKUP_SRW_SYM(TryAcquireSRWLockShared);
+                LOOKUP_SRW_SYM(ReleaseSRWLockExclusive);
+                LOOKUP_SRW_SYM(AcquireSRWLockExclusive);
+                LOOKUP_SRW_SYM(TryAcquireSRWLockExclusive);
+                #undef LOOKUP_SRW_SYM
+                if (okay) {
+                    impl = &SDL_rwlock_impl_srw;  /* Use the Windows provided API instead of generic fallback */
+                }
+            }
+        }
+#endif
+
+        SDL_copyp(&SDL_rwlock_impl_active, impl);
+    }
+    return SDL_rwlock_impl_active.Create();
+}
+
+void SDL_DestroyRWLock(SDL_RWLock *rwlock)
+{
+    SDL_rwlock_impl_active.Destroy(rwlock);
+}
+
+int SDL_LockRWLockForReading(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    return SDL_rwlock_impl_active.LockForReading(rwlock);
+}
+
+int SDL_LockRWLockForWriting(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    return SDL_rwlock_impl_active.LockForWriting(rwlock);
+}
+
+int SDL_TryLockRWLockForReading(SDL_RWLock *rwlock)
+{
+    return SDL_rwlock_impl_active.TryLockForReading(rwlock);
+}
+
+int SDL_TryLockRWLockForWriting(SDL_RWLock *rwlock)
+{
+    return SDL_rwlock_impl_active.TryLockForWriting(rwlock);
+}
+
+int SDL_UnlockRWLock(SDL_RWLock *rwlock) SDL_NO_THREAD_SAFETY_ANALYSIS /* clang doesn't know about NULL mutexes */
+{
+    return SDL_rwlock_impl_active.Unlock(rwlock);
+}

external/sdl/SDL/src/thread/windows/SDL_syssem.c

@@ -0,0 +1,389 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_WINDOWS
+
+/**
+ * Semaphore functions using the Win32 API
+ * There are two implementations available based on:
+ * - Kernel Semaphores. Available on all OS versions. (kern)
+ *   Heavy-weight inter-process kernel objects.
+ * - Atomics and WaitOnAddress API. (atom)
+ *   Faster due to significantly less context switches.
+ *   Requires Windows 8 or newer.
+ * which are chosen at runtime.
+ */
+
+#include "../../core/windows/SDL_windows.h"
+
+typedef SDL_Semaphore *(*pfnSDL_CreateSemaphore)(Uint32);
+typedef void (*pfnSDL_DestroySemaphore)(SDL_Semaphore *);
+typedef int (*pfnSDL_WaitSemaphoreTimeoutNS)(SDL_Semaphore *, Sint64);
+typedef Uint32 (*pfnSDL_GetSemaphoreValue)(SDL_Semaphore *);
+typedef int (*pfnSDL_PostSemaphore)(SDL_Semaphore *);
+
+typedef struct SDL_semaphore_impl_t
+{
+    pfnSDL_CreateSemaphore Create;
+    pfnSDL_DestroySemaphore Destroy;
+    pfnSDL_WaitSemaphoreTimeoutNS WaitTimeoutNS;
+    pfnSDL_GetSemaphoreValue Value;
+    pfnSDL_PostSemaphore Post;
+} SDL_sem_impl_t;
+
+/* Implementation will be chosen at runtime based on available Kernel features */
+static SDL_sem_impl_t SDL_sem_impl_active = { 0 };
+
+/**
+ * Atomic + WaitOnAddress implementation
+ */
+
+/* APIs not available on WinPhone 8.1 */
+/* https://www.microsoft.com/en-us/download/details.aspx?id=47328 */
+
+#if !SDL_WINAPI_FAMILY_PHONE
+#ifdef __WINRT__
+/* Functions are guaranteed to be available */
+#define pWaitOnAddress       WaitOnAddress
+#define pWakeByAddressSingle WakeByAddressSingle
+#else
+typedef BOOL(WINAPI *pfnWaitOnAddress)(volatile VOID *, PVOID, SIZE_T, DWORD);
+typedef VOID(WINAPI *pfnWakeByAddressSingle)(PVOID);
+
+static pfnWaitOnAddress pWaitOnAddress = NULL;
+static pfnWakeByAddressSingle pWakeByAddressSingle = NULL;
+#endif
+
+typedef struct SDL_semaphore_atom
+{
+    LONG count;
+} SDL_sem_atom;
+
+static SDL_Semaphore *SDL_CreateSemaphore_atom(Uint32 initial_value)
+{
+    SDL_sem_atom *sem;
+
+    sem = (SDL_sem_atom *)SDL_malloc(sizeof(*sem));
+    if (sem != NULL) {
+        sem->count = initial_value;
+    } else {
+        SDL_OutOfMemory();
+    }
+    return (SDL_Semaphore *)sem;
+}
+
+static void SDL_DestroySemaphore_atom(SDL_Semaphore *sem)
+{
+    if (sem != NULL) {
+        SDL_free(sem);
+    }
+}
+
+static int SDL_WaitSemaphoreTimeoutNS_atom(SDL_Semaphore *_sem, Sint64 timeoutNS)
+{
+    SDL_sem_atom *sem = (SDL_sem_atom *)_sem;
+    LONG count;
+    Uint64 now;
+    Uint64 deadline;
+    DWORD timeout_eff;
+
+    if (sem == NULL) {
+        return SDL_InvalidParamError("sem");
+    }
+
+    if (timeoutNS == 0) {
+        count = sem->count;
+        if (count == 0) {
+            return SDL_MUTEX_TIMEDOUT;
+        }
+
+        if (InterlockedCompareExchange(&sem->count, count - 1, count) == count) {
+            return 0;
+        }
+
+        return SDL_MUTEX_TIMEDOUT;
+    }
+    if (timeoutNS < 0) {
+        for (;;) {
+            count = sem->count;
+            while (count == 0) {
+                if (pWaitOnAddress(&sem->count, &count, sizeof(sem->count), INFINITE) == FALSE) {
+                    return SDL_SetError("WaitOnAddress() failed");
+                }
+                count = sem->count;
+            }
+
+            if (InterlockedCompareExchange(&sem->count, count - 1, count) == count) {
+                return 0;
+            }
+        }
+    }
+
+    /**
+     * WaitOnAddress is subject to spurious and stolen wakeups so we
+     * need to recalculate the effective timeout before every wait
+     */
+    now = SDL_GetTicksNS();
+    deadline = now + timeoutNS;
+
+    for (;;) {
+        count = sem->count;
+        /* If no semaphore is available we need to wait */
+        while (count == 0) {
+            now = SDL_GetTicksNS();
+            if (deadline > now) {
+                timeout_eff = (DWORD)SDL_NS_TO_MS(deadline - now);
+            } else {
+                return SDL_MUTEX_TIMEDOUT;
+            }
+            if (pWaitOnAddress(&sem->count, &count, sizeof(count), timeout_eff) == FALSE) {
+                if (GetLastError() == ERROR_TIMEOUT) {
+                    return SDL_MUTEX_TIMEDOUT;
+                }
+                return SDL_SetError("WaitOnAddress() failed");
+            }
+            count = sem->count;
+        }
+
+        /* Actually the semaphore is only consumed if this succeeds */
+        /* If it doesn't we need to do everything again */
+        if (InterlockedCompareExchange(&sem->count, count - 1, count) == count) {
+            return 0;
+        }
+    }
+}
+
+static Uint32 SDL_GetSemaphoreValue_atom(SDL_Semaphore *_sem)
+{
+    SDL_sem_atom *sem = (SDL_sem_atom *)_sem;
+
+    if (sem == NULL) {
+        SDL_InvalidParamError("sem");
+        return 0;
+    }
+
+    return (Uint32)sem->count;
+}
+
+static int SDL_PostSemaphore_atom(SDL_Semaphore *_sem)
+{
+    SDL_sem_atom *sem = (SDL_sem_atom *)_sem;
+
+    if (sem == NULL) {
+        return SDL_InvalidParamError("sem");
+    }
+
+    InterlockedIncrement(&sem->count);
+    pWakeByAddressSingle(&sem->count);
+
+    return 0;
+}
+
+static const SDL_sem_impl_t SDL_sem_impl_atom = {
+    &SDL_CreateSemaphore_atom,
+    &SDL_DestroySemaphore_atom,
+    &SDL_WaitSemaphoreTimeoutNS_atom,
+    &SDL_GetSemaphoreValue_atom,
+    &SDL_PostSemaphore_atom,
+};
+#endif /* !SDL_WINAPI_FAMILY_PHONE */
+
+/**
+ * Fallback Semaphore implementation using Kernel Semaphores
+ */
+
+typedef struct SDL_semaphore_kern
+{
+    HANDLE id;
+    LONG count;
+} SDL_sem_kern;
+
+/* Create a semaphore */
+static SDL_Semaphore *SDL_CreateSemaphore_kern(Uint32 initial_value)
+{
+    SDL_sem_kern *sem;
+
+    /* Allocate sem memory */
+    sem = (SDL_sem_kern *)SDL_malloc(sizeof(*sem));
+    if (sem != NULL) {
+        /* Create the semaphore, with max value 32K */
+#ifdef __WINRT__
+        sem->id = CreateSemaphoreEx(NULL, initial_value, 32 * 1024, NULL, 0, SEMAPHORE_ALL_ACCESS);
+#else
+        sem->id = CreateSemaphore(NULL, initial_value, 32 * 1024, NULL);
+#endif
+        sem->count = initial_value;
+        if (!sem->id) {
+            SDL_SetError("Couldn't create semaphore");
+            SDL_free(sem);
+            sem = NULL;
+        }
+    } else {
+        SDL_OutOfMemory();
+    }
+    return (SDL_Semaphore *)sem;
+}
+
+/* Free the semaphore */
+static void SDL_DestroySemaphore_kern(SDL_Semaphore *_sem)
+{
+    SDL_sem_kern *sem = (SDL_sem_kern *)_sem;
+    if (sem != NULL) {
+        if (sem->id) {
+            CloseHandle(sem->id);
+            sem->id = 0;
+        }
+        SDL_free(sem);
+    }
+}
+
+static int SDL_WaitSemaphoreTimeoutNS_kern(SDL_Semaphore *_sem, Sint64 timeoutNS)
+{
+    SDL_sem_kern *sem = (SDL_sem_kern *)_sem;
+    int retval;
+    DWORD dwMilliseconds;
+
+    if (sem == NULL) {
+        return SDL_InvalidParamError("sem");
+    }
+
+    if (timeoutNS < 0) {
+        dwMilliseconds = INFINITE;
+    } else {
+        dwMilliseconds = (DWORD)SDL_NS_TO_MS(timeoutNS);
+    }
+    switch (WaitForSingleObjectEx(sem->id, dwMilliseconds, FALSE)) {
+    case WAIT_OBJECT_0:
+        InterlockedDecrement(&sem->count);
+        retval = 0;
+        break;
+    case WAIT_TIMEOUT:
+        retval = SDL_MUTEX_TIMEDOUT;
+        break;
+    default:
+        retval = SDL_SetError("WaitForSingleObject() failed");
+        break;
+    }
+    return retval;
+}
+
+/* Returns the current count of the semaphore */
+static Uint32 SDL_GetSemaphoreValue_kern(SDL_Semaphore *_sem)
+{
+    SDL_sem_kern *sem = (SDL_sem_kern *)_sem;
+    if (sem == NULL) {
+        SDL_InvalidParamError("sem");
+        return 0;
+    }
+    return (Uint32)sem->count;
+}
+
+static int SDL_PostSemaphore_kern(SDL_Semaphore *_sem)
+{
+    SDL_sem_kern *sem = (SDL_sem_kern *)_sem;
+    if (sem == NULL) {
+        return SDL_InvalidParamError("sem");
+    }
+    /* Increase the counter in the first place, because
+     * after a successful release the semaphore may
+     * immediately get destroyed by another thread which
+     * is waiting for this semaphore.
+     */
+    InterlockedIncrement(&sem->count);
+    if (ReleaseSemaphore(sem->id, 1, NULL) == FALSE) {
+        InterlockedDecrement(&sem->count); /* restore */
+        return SDL_SetError("ReleaseSemaphore() failed");
+    }
+    return 0;
+}
+
+static const SDL_sem_impl_t SDL_sem_impl_kern = {
+    &SDL_CreateSemaphore_kern,
+    &SDL_DestroySemaphore_kern,
+    &SDL_WaitSemaphoreTimeoutNS_kern,
+    &SDL_GetSemaphoreValue_kern,
+    &SDL_PostSemaphore_kern,
+};
+
+/**
+ * Runtime selection and redirection
+ */
+
+SDL_Semaphore *SDL_CreateSemaphore(Uint32 initial_value)
+{
+    if (SDL_sem_impl_active.Create == NULL) {
+        /* Default to fallback implementation */
+        const SDL_sem_impl_t *impl = &SDL_sem_impl_kern;
+
+#if !SDL_WINAPI_FAMILY_PHONE
+        if (!SDL_GetHintBoolean(SDL_HINT_WINDOWS_FORCE_SEMAPHORE_KERNEL, SDL_FALSE)) {
+#ifdef __WINRT__
+            /* Link statically on this platform */
+            impl = &SDL_sem_impl_atom;
+#else
+            /* We already statically link to features from this Api
+             * Set (e.g. WaitForSingleObject). Dynamically loading
+             * API Sets is not explicitly documented but according to
+             * Microsoft our specific use case is legal and correct:
+             * https://github.com/microsoft/STL/pull/593#issuecomment-655799859
+             */
+            HMODULE synch120 = GetModuleHandle(TEXT("api-ms-win-core-synch-l1-2-0.dll"));
+            if (synch120) {
+                /* Try to load required functions provided by Win 8 or newer */
+                pWaitOnAddress = (pfnWaitOnAddress)GetProcAddress(synch120, "WaitOnAddress");
+                pWakeByAddressSingle = (pfnWakeByAddressSingle)GetProcAddress(synch120, "WakeByAddressSingle");
+
+                if (pWaitOnAddress && pWakeByAddressSingle) {
+                    impl = &SDL_sem_impl_atom;
+                }
+            }
+#endif
+        }
+#endif
+
+        /* Copy instead of using pointer to save one level of indirection */
+        SDL_copyp(&SDL_sem_impl_active, impl);
+    }
+    return SDL_sem_impl_active.Create(initial_value);
+}
+
+void SDL_DestroySemaphore(SDL_Semaphore *sem)
+{
+    SDL_sem_impl_active.Destroy(sem);
+}
+
+int SDL_WaitSemaphoreTimeoutNS(SDL_Semaphore *sem, Sint64 timeoutNS)
+{
+    return SDL_sem_impl_active.WaitTimeoutNS(sem, timeoutNS);
+}
+
+Uint32 SDL_GetSemaphoreValue(SDL_Semaphore *sem)
+{
+    return SDL_sem_impl_active.Value(sem);
+}
+
+int SDL_PostSemaphore(SDL_Semaphore *sem)
+{
+    return SDL_sem_impl_active.Post(sem);
+}
+
+#endif /* SDL_THREAD_WINDOWS */

external/sdl/SDL/src/thread/windows/SDL_systhread.c

@@ -0,0 +1,200 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_WINDOWS
+
+/* Win32 thread management routines for SDL */
+
+#include "../SDL_thread_c.h"
+#include "../SDL_systhread.h"
+#include "SDL_systhread_c.h"
+
+#ifndef STACK_SIZE_PARAM_IS_A_RESERVATION
+#define STACK_SIZE_PARAM_IS_A_RESERVATION 0x00010000
+#endif
+
+#ifndef SDL_PASSED_BEGINTHREAD_ENDTHREAD
+/* We'll use the C library from this DLL */
+#include <process.h>
+typedef uintptr_t(__cdecl *pfnSDL_CurrentBeginThread)(void *, unsigned,
+                                                      unsigned(__stdcall *func)(void*),
+                                                      void *arg, unsigned,
+                                                      unsigned *threadID);
+typedef void(__cdecl *pfnSDL_CurrentEndThread)(unsigned code);
+#endif /* !SDL_PASSED_BEGINTHREAD_ENDTHREAD */
+
+static DWORD RunThread(void *data)
+{
+    SDL_Thread *thread = (SDL_Thread *)data;
+    pfnSDL_CurrentEndThread pfnEndThread = (pfnSDL_CurrentEndThread)thread->endfunc;
+    SDL_RunThread(thread);
+    if (pfnEndThread != NULL) {
+        pfnEndThread(0);
+    }
+    return 0;
+}
+
+static DWORD WINAPI RunThreadViaCreateThread(LPVOID data)
+{
+    return RunThread(data);
+}
+
+static unsigned __stdcall RunThreadViaBeginThreadEx(void *data)
+{
+    return (unsigned)RunThread(data);
+}
+
+#ifdef SDL_PASSED_BEGINTHREAD_ENDTHREAD
+int SDL_SYS_CreateThread(SDL_Thread *thread,
+                         pfnSDL_CurrentBeginThread pfnBeginThread,
+                         pfnSDL_CurrentEndThread pfnEndThread)
+{
+#elif defined(__CYGWIN__) || defined(__WINRT__)
+int SDL_SYS_CreateThread(SDL_Thread *thread)
+{
+    pfnSDL_CurrentBeginThread pfnBeginThread = NULL;
+    pfnSDL_CurrentEndThread pfnEndThread = NULL;
+#else
+int SDL_SYS_CreateThread(SDL_Thread *thread)
+{
+    pfnSDL_CurrentBeginThread pfnBeginThread = (pfnSDL_CurrentBeginThread)_beginthreadex;
+    pfnSDL_CurrentEndThread pfnEndThread = (pfnSDL_CurrentEndThread)_endthreadex;
+#endif /* SDL_PASSED_BEGINTHREAD_ENDTHREAD */
+    const DWORD flags = thread->stacksize ? STACK_SIZE_PARAM_IS_A_RESERVATION : 0;
+
+    /* Save the function which we will have to call to clear the RTL of calling app! */
+    thread->endfunc = pfnEndThread;
+
+    /* thread->stacksize == 0 means "system default", same as win32 expects */
+    if (pfnBeginThread) {
+        unsigned threadid = 0;
+        thread->handle = (SYS_ThreadHandle)((size_t)pfnBeginThread(NULL, (unsigned int)thread->stacksize,
+                                                                   RunThreadViaBeginThreadEx,
+                                                                   thread, flags, &threadid));
+    } else {
+        DWORD threadid = 0;
+        thread->handle = CreateThread(NULL, thread->stacksize,
+                                      RunThreadViaCreateThread,
+                                      thread, flags, &threadid);
+    }
+    if (thread->handle == NULL) {
+        return SDL_SetError("Not enough resources to create thread");
+    }
+    return 0;
+}
+
+#pragma pack(push, 8)
+typedef struct tagTHREADNAME_INFO
+{
+    DWORD dwType;     /* must be 0x1000 */
+    LPCSTR szName;    /* pointer to name (in user addr space) */
+    DWORD dwThreadID; /* thread ID (-1=caller thread) */
+    DWORD dwFlags;    /* reserved for future use, must be zero */
+} THREADNAME_INFO;
+#pragma pack(pop)
+
+typedef HRESULT(WINAPI *pfnSetThreadDescription)(HANDLE, PCWSTR);
+
+void SDL_SYS_SetupThread(const char *name)
+{
+    if (name != NULL) {
+#ifndef __WINRT__ /* !!! FIXME: There's no LoadLibrary() in WinRT; don't know if SetThreadDescription is available there at all at the moment. */
+        static pfnSetThreadDescription pSetThreadDescription = NULL;
+        static HMODULE kernel32 = NULL;
+
+        if (!kernel32) {
+            kernel32 = GetModuleHandle(TEXT("kernel32.dll"));
+            if (kernel32) {
+                pSetThreadDescription = (pfnSetThreadDescription)GetProcAddress(kernel32, "SetThreadDescription");
+            }
+        }
+
+        if (pSetThreadDescription != NULL) {
+            WCHAR *strw = WIN_UTF8ToStringW(name);
+            if (strw) {
+                pSetThreadDescription(GetCurrentThread(), strw);
+                SDL_free(strw);
+            }
+        }
+#endif
+
+        /* Presumably some version of Visual Studio will understand SetThreadDescription(),
+           but we still need to deal with older OSes and debuggers. Set it with the arcane
+           exception magic, too. */
+
+        if (IsDebuggerPresent()) {
+            THREADNAME_INFO inf;
+
+            /* C# and friends will try to catch this Exception, let's avoid it. */
+            if (SDL_GetHintBoolean(SDL_HINT_WINDOWS_DISABLE_THREAD_NAMING, SDL_TRUE)) {
+                return;
+            }
+
+            /* This magic tells the debugger to name a thread if it's listening. */
+            SDL_zero(inf);
+            inf.dwType = 0x1000;
+            inf.szName = name;
+            inf.dwThreadID = (DWORD)-1;
+            inf.dwFlags = 0;
+
+            /* The debugger catches this, renames the thread, continues on. */
+            RaiseException(0x406D1388, 0, sizeof(inf) / sizeof(ULONG), (const ULONG_PTR *)&inf);
+        }
+    }
+}
+
+SDL_threadID SDL_ThreadID(void)
+{
+    return (SDL_threadID)GetCurrentThreadId();
+}
+
+int SDL_SYS_SetThreadPriority(SDL_ThreadPriority priority)
+{
+    int value;
+
+    if (priority == SDL_THREAD_PRIORITY_LOW) {
+        value = THREAD_PRIORITY_LOWEST;
+    } else if (priority == SDL_THREAD_PRIORITY_HIGH) {
+        value = THREAD_PRIORITY_HIGHEST;
+    } else if (priority == SDL_THREAD_PRIORITY_TIME_CRITICAL) {
+        value = THREAD_PRIORITY_TIME_CRITICAL;
+    } else {
+        value = THREAD_PRIORITY_NORMAL;
+    }
+    if (!SetThreadPriority(GetCurrentThread(), value)) {
+        return WIN_SetError("SetThreadPriority()");
+    }
+    return 0;
+}
+
+void SDL_SYS_WaitThread(SDL_Thread *thread)
+{
+    WaitForSingleObjectEx(thread->handle, INFINITE, FALSE);
+    CloseHandle(thread->handle);
+}
+
+void SDL_SYS_DetachThread(SDL_Thread *thread)
+{
+    CloseHandle(thread->handle);
+}
+
+#endif /* SDL_THREAD_WINDOWS */

external/sdl/SDL/src/thread/windows/SDL_systhread_c.h

@@ -0,0 +1,30 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+#include "SDL_internal.h"
+
+#ifndef SDL_systhread_c_h_
+#define SDL_systhread_c_h_
+
+#include "../../core/windows/SDL_windows.h"
+
+typedef HANDLE SYS_ThreadHandle;
+
+#endif /* SDL_systhread_c_h_ */

external/sdl/SDL/src/thread/windows/SDL_systls.c

@@ -0,0 +1,79 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+#include "SDL_internal.h"
+
+#ifdef SDL_THREAD_WINDOWS
+
+#include "../../core/windows/SDL_windows.h"
+
+#include "../SDL_thread_c.h"
+
+#if WINAPI_FAMILY_WINRT
+#include <fibersapi.h>
+
+#ifndef TLS_OUT_OF_INDEXES
+#define TLS_OUT_OF_INDEXES FLS_OUT_OF_INDEXES
+#endif
+
+#define TlsAlloc()  FlsAlloc(NULL)
+#define TlsSetValue FlsSetValue
+#define TlsGetValue FlsGetValue
+#endif
+
+static DWORD thread_local_storage = TLS_OUT_OF_INDEXES;
+static SDL_bool generic_local_storage = SDL_FALSE;
+
+SDL_TLSData *SDL_SYS_GetTLSData(void)
+{
+    if (thread_local_storage == TLS_OUT_OF_INDEXES && !generic_local_storage) {
+        static SDL_SpinLock lock;
+        SDL_AtomicLock(&lock);
+        if (thread_local_storage == TLS_OUT_OF_INDEXES && !generic_local_storage) {
+            DWORD storage = TlsAlloc();
+            if (storage != TLS_OUT_OF_INDEXES) {
+                SDL_MemoryBarrierRelease();
+                thread_local_storage = storage;
+            } else {
+                generic_local_storage = SDL_TRUE;
+            }
+        }
+        SDL_AtomicUnlock(&lock);
+    }
+    if (generic_local_storage) {
+        return SDL_Generic_GetTLSData();
+    }
+    SDL_MemoryBarrierAcquire();
+    return (SDL_TLSData *)TlsGetValue(thread_local_storage);
+}
+
+int SDL_SYS_SetTLSData(SDL_TLSData *data)
+{
+    if (generic_local_storage) {
+        return SDL_Generic_SetTLSData(data);
+    }
+    if (!TlsSetValue(thread_local_storage, data)) {
+        return SDL_SetError("TlsSetValue() failed");
+    }
+    return 0;
+}
+
+#endif /* SDL_THREAD_WINDOWS */