2 /* Simple test of the SDL semaphore code */
9 #include "SDL_thread.h"
11 #define NUM_THREADS 10
16 int SDLCALL ThreadFunc(void *data)
18 int threadnum = (int)(uintptr_t)data;
21 fprintf(stderr, "Thread number %d has got the semaphore (value = %d)!\n", threadnum, SDL_SemValue(sem));
24 fprintf(stderr, "Thread number %d has released the semaphore (value = %d)!\n", threadnum, SDL_SemValue(sem));
25 SDL_Delay(1); /* For the scheduler */
27 printf("Thread number %d exiting.\n", threadnum);
31 static void killed(int sig)
36 int main(int argc, char **argv)
38 SDL_Thread *threads[NUM_THREADS];
43 fprintf(stderr,"Usage: %s init_value\n", argv[0]);
47 /* Load the SDL library */
48 if ( SDL_Init(0) < 0 ) {
49 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
52 signal(SIGTERM, killed);
53 signal(SIGINT, killed);
55 init_sem = atoi(argv[1]);
56 sem = SDL_CreateSemaphore(init_sem);
58 printf("Running %d threads, semaphore value = %d\n", NUM_THREADS, init_sem);
59 /* Create all the threads */
60 for( i = 0; i < NUM_THREADS; ++i ) {
61 threads[i] = SDL_CreateThread(ThreadFunc, (void*)i);
67 /* Wait for all threads to finish */
68 printf("Waiting for threads to finish\n");
70 for( i = 0; i < NUM_THREADS; ++i ) {
71 SDL_WaitThread(threads[i], NULL);
73 printf("Finished waiting for threads\n");
75 SDL_DestroySemaphore(sem);