2 Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
4 This software is provided 'as-is', without any express or implied
5 warranty. In no event will the authors be held liable for any damages
6 arising from the use of this software.
8 Permission is granted to anyone to use this software for any purpose,
9 including commercial applications, and to alter it and redistribute it
13 /* Simple test of the SDL semaphore code */
21 #define NUM_THREADS 10
27 ThreadFunc(void *data)
29 int threadnum = (int) (uintptr_t) data;
32 SDL_Log("Thread number %d has got the semaphore (value = %d)!\n",
33 threadnum, SDL_SemValue(sem));
36 SDL_Log("Thread number %d has released the semaphore (value = %d)!\n",
37 threadnum, SDL_SemValue(sem));
38 SDL_Delay(1); /* For the scheduler */
40 SDL_Log("Thread number %d exiting.\n", threadnum);
58 sem = SDL_CreateSemaphore(0);
59 SDL_Log("Waiting 2 seconds on semaphore\n");
61 start_ticks = SDL_GetTicks();
62 retval = SDL_SemWaitTimeout(sem, 2000);
63 end_ticks = SDL_GetTicks();
65 duration = end_ticks - start_ticks;
67 /* Accept a little offset in the effective wait */
68 if (duration > 1900 && duration < 2050)
69 SDL_Log("Wait done.\n");
71 SDL_Log("Wait took %d milliseconds\n", duration);
73 /* Check to make sure the return value indicates timed out */
74 if (retval != SDL_MUTEX_TIMEDOUT)
75 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "SDL_SemWaitTimeout returned: %d; expected: %d\n", retval, SDL_MUTEX_TIMEDOUT);
79 main(int argc, char **argv)
81 SDL_Thread *threads[NUM_THREADS];
85 /* Enable standard application logging */
86 SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
89 SDL_Log("Usage: %s init_value\n", argv[0]);
93 /* Load the SDL library */
94 if (SDL_Init(0) < 0) {
95 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
98 signal(SIGTERM, killed);
99 signal(SIGINT, killed);
101 init_sem = atoi(argv[1]);
102 sem = SDL_CreateSemaphore(init_sem);
104 SDL_Log("Running %d threads, semaphore value = %d\n", NUM_THREADS,
106 /* Create all the threads */
107 for (i = 0; i < NUM_THREADS; ++i) {
109 SDL_snprintf(name, sizeof (name), "Thread%u", (unsigned int) i);
110 threads[i] = SDL_CreateThread(ThreadFunc, name, (void *) i);
113 /* Wait 10 seconds */
114 SDL_Delay(10 * 1000);
116 /* Wait for all threads to finish */
117 SDL_Log("Waiting for threads to finish\n");
119 for (i = 0; i < NUM_THREADS; ++i) {
120 SDL_WaitThread(threads[i], NULL);
122 SDL_Log("Finished waiting for threads\n");
124 SDL_DestroySemaphore(sem);