| 1 | |
| 2 | /* Simple test of the SDL semaphore code */ |
| 3 | |
| 4 | #include <stdio.h> |
| 5 | #include <stdlib.h> |
| 6 | #include <signal.h> |
| 7 | |
| 8 | #include "SDL.h" |
| 9 | #include "SDL_thread.h" |
| 10 | |
| 11 | #define NUM_THREADS 10 |
| 12 | |
| 13 | static SDL_sem *sem; |
| 14 | int alive = 1; |
| 15 | |
| 16 | int SDLCALL ThreadFunc(void *data) |
| 17 | { |
| 18 | int threadnum = (int)(uintptr_t)data; |
| 19 | while ( alive ) { |
| 20 | SDL_SemWait(sem); |
| 21 | fprintf(stderr, "Thread number %d has got the semaphore (value = %d)!\n", threadnum, SDL_SemValue(sem)); |
| 22 | SDL_Delay(200); |
| 23 | SDL_SemPost(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 */ |
| 26 | } |
| 27 | printf("Thread number %d exiting.\n", threadnum); |
| 28 | return 0; |
| 29 | } |
| 30 | |
| 31 | static void killed(int sig) |
| 32 | { |
| 33 | alive = 0; |
| 34 | } |
| 35 | |
| 36 | int main(int argc, char **argv) |
| 37 | { |
| 38 | SDL_Thread *threads[NUM_THREADS]; |
| 39 | uintptr_t i; |
| 40 | int init_sem; |
| 41 | |
| 42 | if(argc < 2) { |
| 43 | fprintf(stderr,"Usage: %s init_value\n", argv[0]); |
| 44 | return(1); |
| 45 | } |
| 46 | |
| 47 | /* Load the SDL library */ |
| 48 | if ( SDL_Init(0) < 0 ) { |
| 49 | fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError()); |
| 50 | return(1); |
| 51 | } |
| 52 | signal(SIGTERM, killed); |
| 53 | signal(SIGINT, killed); |
| 54 | |
| 55 | init_sem = atoi(argv[1]); |
| 56 | sem = SDL_CreateSemaphore(init_sem); |
| 57 | |
| 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); |
| 62 | } |
| 63 | |
| 64 | /* Wait 10 seconds */ |
| 65 | SDL_Delay(10 * 1000); |
| 66 | |
| 67 | /* Wait for all threads to finish */ |
| 68 | printf("Waiting for threads to finish\n"); |
| 69 | alive = 0; |
| 70 | for( i = 0; i < NUM_THREADS; ++i ) { |
| 71 | SDL_WaitThread(threads[i], NULL); |
| 72 | } |
| 73 | printf("Finished waiting for threads\n"); |
| 74 | |
| 75 | SDL_DestroySemaphore(sem); |
| 76 | SDL_Quit(); |
| 77 | return(0); |
| 78 | } |