1 2 /* Simple test of the SDL threading code */ 3 4 #include <stdio.h> 5 #include <stdlib.h> 6 #include <signal.h> 7 #include <string.h> 8 9 #include "SDL.h" 10 #include "SDL_thread.h" 11 12 #define NUMTHREADS 10 13 14 static char volatile time_for_threads_to_die[NUMTHREADS]; 15 16 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */ 17 static void quit(int rc) 18 { 19 SDL_Quit(); 20 exit(rc); 21 } 22 23 int SDLCALL SubThreadFunc(void *data) { 24 while(! *(int volatile *)data) { 25 ; /*SDL_Delay(10);*/ /* do nothing */ 26 } 27 return 0; 28 } 29 30 int SDLCALL ThreadFunc(void *data) { 31 SDL_Thread *sub_threads[NUMTHREADS]; 32 int flags[NUMTHREADS]; 33 int i; 34 int tid = (int)(uintptr_t)data; 35 36 fprintf(stderr, "Creating Thread %d\n", tid); 37 38 for(i = 0; i < NUMTHREADS; i++) { 39 flags[i] = 0; 40 sub_threads[i] = SDL_CreateThread(SubThreadFunc, &flags[i]); 41 } 42 43 printf("Thread '%d' waiting for signal\n", tid); 44 while(time_for_threads_to_die[tid] != 1) { 45 ; /* do nothing */ 46 } 47 48 printf("Thread '%d' sending signals to subthreads\n", tid); 49 for(i = 0; i < NUMTHREADS; i++) { 50 flags[i] = 1; 51 SDL_WaitThread(sub_threads[i], NULL); 52 } 53 54 printf("Thread '%d' exiting!\n", tid); 55 56 return 0; 57 } 58 59 int main(int argc, char *argv[]) 60 { 61 SDL_Thread *threads[NUMTHREADS]; 62 int i; 63 64 /* Load the SDL library */ 65 if ( SDL_Init(0) < 0 ) { 66 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError()); 67 return(1); 68 } 69 70 signal(SIGSEGV, SIG_DFL); 71 for(i = 0; i < NUMTHREADS; i++) { 72 time_for_threads_to_die[i] = 0; 73 threads[i] = SDL_CreateThread(ThreadFunc, (void *)(uintptr_t)i); 74 75 if ( threads[i] == NULL ) { 76 fprintf(stderr, 77 "Couldn't create thread: %s\n", SDL_GetError()); 78 quit(1); 79 } 80 } 81 82 for(i = 0; i < NUMTHREADS; i++) { 83 time_for_threads_to_die[i] = 1; 84 } 85 86 for(i = 0; i < NUMTHREADS; i++) { 87 SDL_WaitThread(threads[i], NULL); 88 } 89 SDL_Quit(); 90 return(0); 91 } 92
