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

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;
+}
+