forked from Green-Sky/tomato
Merge commit 'dec0d4ec4153bf9fc2b78ae6c2df45b6ea8dde7a' as 'external/sdl/SDL'
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179
external/sdl/SDL/test/testrwlock.c
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179
external/sdl/SDL/test/testrwlock.c
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/*
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Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely.
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*/
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/* Test the thread and rwlock locking functions
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Also exercises the system's signal/thread interaction
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*/
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#include <SDL3/SDL.h>
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#include <SDL3/SDL_main.h>
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#include <SDL3/SDL_test.h>
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static SDL_RWLock *rwlock = NULL;
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static SDL_threadID mainthread;
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static SDL_AtomicInt doterminate;
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static int nb_threads = 6;
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static SDL_Thread **threads;
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static int worktime = 1000;
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static int writerworktime = 100;
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static int timeout = 10000;
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static SDLTest_CommonState *state;
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static void DoWork(const int workticks) /* "Work" */
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{
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const SDL_threadID tid = SDL_ThreadID();
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const SDL_bool is_reader = tid != mainthread;
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const char *typestr = is_reader ? "Reader" : "Writer";
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int rc;
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SDL_Log("%s Thread %lu: ready to work\n", typestr, (unsigned long) tid);
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rc = is_reader ? SDL_LockRWLockForReading(rwlock) : SDL_LockRWLockForWriting(rwlock);
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if (rc < 0) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "%s Thread %lu: Couldn't lock rwlock: %s", typestr, (unsigned long) tid, SDL_GetError());
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} else {
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SDL_Log("%s Thread %lu: start work!\n", typestr, (unsigned long) tid);
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SDL_Delay(workticks);
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SDL_Log("%s Thread %lu: work done!\n", typestr, (unsigned long) tid);
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if (SDL_UnlockRWLock(rwlock) < 0) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "%s Thread %lu: Couldn't unlock rwlock: %s", typestr, (unsigned long) tid, SDL_GetError());
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}
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/* If this sleep isn't done, then threads may starve */
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SDL_Delay(10);
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}
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}
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static int SDLCALL
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ReaderRun(void *data)
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{
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SDL_Log("Reader Thread %lu: starting up", SDL_ThreadID());
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while (!SDL_AtomicGet(&doterminate)) {
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DoWork(worktime);
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}
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SDL_Log("Reader Thread %lu: exiting!\n", SDL_ThreadID());
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return 0;
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}
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int main(int argc, char *argv[])
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{
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int i;
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/* Initialize test framework */
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state = SDLTest_CommonCreateState(argv, 0);
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if (state == NULL) {
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return 1;
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}
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SDL_AtomicSet(&doterminate, 0);
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/* Enable standard application logging */
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SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
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/* Parse commandline */
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for (i = 1; i < argc;) {
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int consumed;
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consumed = SDLTest_CommonArg(state, i);
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if (!consumed) {
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if (SDL_strcmp(argv[i], "--nbthreads") == 0) {
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if (argv[i + 1]) {
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char *endptr;
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nb_threads = SDL_strtol(argv[i + 1], &endptr, 0);
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if (endptr != argv[i + 1] && *endptr == '\0' && nb_threads > 0) {
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consumed = 2;
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}
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}
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} else if (SDL_strcmp(argv[i], "--worktime") == 0) {
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if (argv[i + 1]) {
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char *endptr;
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worktime = SDL_strtol(argv[i + 1], &endptr, 0);
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if (endptr != argv[i + 1] && *endptr == '\0' && worktime > 0) {
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consumed = 2;
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}
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}
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} else if (SDL_strcmp(argv[i], "--writerworktime") == 0) {
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if (argv[i + 1]) {
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char *endptr;
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writerworktime = SDL_strtol(argv[i + 1], &endptr, 0);
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if (endptr != argv[i + 1] && *endptr == '\0' && writerworktime > 0) {
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consumed = 2;
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}
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}
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} else if (SDL_strcmp(argv[i], "--timeout") == 0) {
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if (argv[i + 1]) {
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char *endptr;
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timeout = (Uint64) SDL_strtol(argv[i + 1], &endptr, 0);
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if (endptr != argv[i + 1] && *endptr == '\0' && timeout > 0) {
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consumed = 2;
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}
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}
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}
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}
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if (consumed <= 0) {
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static const char *options[] = {
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"[--nbthreads NB]",
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"[--worktime ms]",
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"[--writerworktime ms]",
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"[--timeout ms]",
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NULL,
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};
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SDLTest_CommonLogUsage(state, argv[0], options);
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return 1;
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}
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i += consumed;
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}
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threads = SDL_malloc(nb_threads * sizeof(SDL_Thread*));
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/* Load the SDL library */
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if (SDL_Init(0) < 0) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "%s\n", SDL_GetError());
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return 1;
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}
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SDL_AtomicSet(&doterminate, 0);
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rwlock = SDL_CreateRWLock();
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if (rwlock == NULL) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create rwlock: %s\n", SDL_GetError());
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SDL_Quit();
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SDLTest_CommonDestroyState(state);
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return 1;
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}
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mainthread = SDL_ThreadID();
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SDL_Log("Writer thread: %lu\n", mainthread);
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for (i = 0; i < nb_threads; ++i) {
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char name[64];
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(void)SDL_snprintf(name, sizeof(name), "Reader%d", i);
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threads[i] = SDL_CreateThread(ReaderRun, name, NULL);
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if (threads[i] == NULL) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create reader thread! %s\n", SDL_GetError());
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}
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}
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while (!SDL_AtomicGet(&doterminate) && (SDL_GetTicks() < ((Uint64) timeout))) {
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DoWork(writerworktime);
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}
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SDL_AtomicSet(&doterminate, 1);
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SDL_Log("Waiting on reader threads to terminate...");
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for (i = 0; i < nb_threads; ++i) {
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SDL_WaitThread(threads[i], NULL);
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}
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SDL_Log("Reader threads have terminated, quitting!");
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SDL_DestroyRWLock(rwlock);
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SDLTest_CommonDestroyState(state);
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SDL_Quit();
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return 0;
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}
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