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128 lines
3.4 KiB
C
128 lines
3.4 KiB
C
/*
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Copyright (C) 1997-2019 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 mutex locking functions
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Also exercises the system's signal/thread interaction
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*/
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h> /* for atexit() */
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#include "SDL.h"
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static SDL_mutex *mutex = NULL;
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static SDL_threadID mainthread;
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static SDL_Thread *threads[6];
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static SDL_atomic_t doterminate;
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/*
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* SDL_Quit() shouldn't be used with atexit() directly because
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* calling conventions may differ...
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*/
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static void
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SDL_Quit_Wrapper(void)
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{
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SDL_Quit();
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}
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void
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printid(void)
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{
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SDL_Log("Process %lu: exiting\n", SDL_ThreadID());
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}
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void
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terminate(int sig)
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{
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signal(SIGINT, terminate);
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SDL_AtomicSet(&doterminate, 1);
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}
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void
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closemutex(int sig)
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{
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SDL_threadID id = SDL_ThreadID();
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int i;
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SDL_Log("Process %lu: Cleaning up...\n", id == mainthread ? 0 : id);
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SDL_AtomicSet(&doterminate, 1);
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for (i = 0; i < 6; ++i)
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SDL_WaitThread(threads[i], NULL);
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SDL_DestroyMutex(mutex);
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exit(sig);
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}
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int SDLCALL
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Run(void *data)
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{
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if (SDL_ThreadID() == mainthread)
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signal(SIGTERM, closemutex);
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while (!SDL_AtomicGet(&doterminate)) {
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SDL_Log("Process %lu ready to work\n", SDL_ThreadID());
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if (SDL_LockMutex(mutex) < 0) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't lock mutex: %s", SDL_GetError());
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exit(1);
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}
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SDL_Log("Process %lu, working!\n", SDL_ThreadID());
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SDL_Delay(1 * 1000);
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SDL_Log("Process %lu, done!\n", SDL_ThreadID());
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if (SDL_UnlockMutex(mutex) < 0) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't unlock mutex: %s", SDL_GetError());
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exit(1);
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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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if (SDL_ThreadID() == mainthread && SDL_AtomicGet(&doterminate)) {
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SDL_Log("Process %lu: raising SIGTERM\n", SDL_ThreadID());
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raise(SIGTERM);
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}
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return (0);
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}
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int
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main(int argc, char *argv[])
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{
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int i;
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int maxproc = 6;
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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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/* 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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exit(1);
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}
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atexit(SDL_Quit_Wrapper);
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SDL_AtomicSet(&doterminate, 0);
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if ((mutex = SDL_CreateMutex()) == NULL) {
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create mutex: %s\n", SDL_GetError());
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exit(1);
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}
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mainthread = SDL_ThreadID();
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SDL_Log("Main thread: %lu\n", mainthread);
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atexit(printid);
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for (i = 0; i < maxproc; ++i) {
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char name[64];
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SDL_snprintf(name, sizeof (name), "Worker%d", i);
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if ((threads[i] = SDL_CreateThread(Run, name, NULL)) == NULL)
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SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create thread!\n");
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}
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signal(SIGINT, terminate);
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Run(NULL);
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return (0); /* Never reached */
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}
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