| |
| /* Simple test of the SDL semaphore code */ |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <signal.h> |
| |
| #include "SDL.h" |
| #include "SDL_thread.h" |
| |
| #define NUM_THREADS 10 |
| |
| static SDL_sem *sem; |
| int alive = 1; |
| |
| int SDLCALL |
| ThreadFunc(void *data) |
| { |
| int threadnum = (int) (uintptr_t) data; |
| while (alive) { |
| SDL_SemWait(sem); |
| fprintf(stderr, |
| "Thread number %d has got the semaphore (value = %d)!\n", |
| threadnum, SDL_SemValue(sem)); |
| SDL_Delay(200); |
| SDL_SemPost(sem); |
| fprintf(stderr, |
| "Thread number %d has released the semaphore (value = %d)!\n", |
| threadnum, SDL_SemValue(sem)); |
| SDL_Delay(1); /* For the scheduler */ |
| } |
| printf("Thread number %d exiting.\n", threadnum); |
| return 0; |
| } |
| |
| static void |
| killed(int sig) |
| { |
| alive = 0; |
| } |
| |
| int |
| main(int argc, char **argv) |
| { |
| SDL_Thread *threads[NUM_THREADS]; |
| uintptr_t i; |
| int init_sem; |
| |
| if (argc < 2) { |
| fprintf(stderr, "Usage: %s init_value\n", argv[0]); |
| return (1); |
| } |
| |
| /* Load the SDL library */ |
| if (SDL_Init(0) < 0) { |
| fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError()); |
| return (1); |
| } |
| signal(SIGTERM, killed); |
| signal(SIGINT, killed); |
| |
| init_sem = atoi(argv[1]); |
| sem = SDL_CreateSemaphore(init_sem); |
| |
| printf("Running %d threads, semaphore value = %d\n", NUM_THREADS, |
| init_sem); |
| /* Create all the threads */ |
| for (i = 0; i < NUM_THREADS; ++i) { |
| threads[i] = SDL_CreateThread(ThreadFunc, (void *) i); |
| } |
| |
| /* Wait 10 seconds */ |
| SDL_Delay(10 * 1000); |
| |
| /* Wait for all threads to finish */ |
| printf("Waiting for threads to finish\n"); |
| alive = 0; |
| for (i = 0; i < NUM_THREADS; ++i) { |
| SDL_WaitThread(threads[i], NULL); |
| } |
| printf("Finished waiting for threads\n"); |
| |
| SDL_DestroySemaphore(sem); |
| SDL_Quit(); |
| return (0); |
| } |