FUNCTIONS

1. SubThreadFunc
2. ThreadFunc
3. main

   2 /* Simple test of the SDL threading code */
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <signal.h>
   7 #include <string.h>
   9 #include "SDL.h"
  10 #include "SDL_thread.h"
  12 #define NUMTHREADS 10
  14 static char volatile time_for_threads_to_die[NUMTHREADS];
  16 int SubThreadFunc(void *data) {
     /* [<][>][^][v][top][bottom][index][help] */
  17         while(! *(int volatile *)data) {
  18                 ; /*SDL_Delay(10); /* do nothing */
  19         }
  20         return 0;
  21 }
  23 int ThreadFunc(void *data) {
     /* [<][>][^][v][top][bottom][index][help] */
  24         SDL_Thread *sub_threads[NUMTHREADS];
  25         int flags[NUMTHREADS];
  26         int i;
  27         int tid = (int ) data;
  29         fprintf(stderr, "Creating Thread %d\n", tid);
  31         for(i = 0; i < NUMTHREADS; i++) {
  32                 flags[i] = 0;
  33                 sub_threads[i] = SDL_CreateThread(SubThreadFunc, &flags[i]);
  34         }
  36         printf("Thread '%d' waiting for signal\n", tid);
  37         while(time_for_threads_to_die[tid] != 1) {
  38                 ; /* do nothing */
  39         }
  41         printf("Thread '%d' sending signals to subthreads\n", tid);
  42         for(i = 0; i <  NUMTHREADS; i++) {
  43                 flags[i] = 1;
SDL_WaitThread(sub_threads[i], NULL);
  45         }
  47         printf("Thread '%d' exiting!\n", tid);
  49         return 0;
  50 }
  52 int main(int argc, char *argv[])
     /* [<][>][^][v][top][bottom][index][help] */
  53 {
  54         SDL_Thread *threads[NUMTHREADS];
  55         int i;
  57         /* Load the SDL library */
  58         if ( SDL_Init(0) < 0 ) {
  59                 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
  60                 exit(1);
  61         }
  62         atexit(SDL_Quit);
  65         signal(SIGSEGV, SIG_DFL);
  66         for(i = 0; i < NUMTHREADS; i++) {
  67                 time_for_threads_to_die[i] = 0;
  68                 threads[i] = SDL_CreateThread(ThreadFunc, (void *) i);
  70                 if ( threads[i] == NULL ) {
  71                         fprintf(stderr,
  72                         "Couldn't create thread: %s\n", SDL_GetError());
  73                         exit(1);
  74                 }
  75         }
  77         for(i = 0; i < NUMTHREADS; i++) {
  78                 time_for_threads_to_die[i] = 1;
  79         }
  81         for(i = NUMTHREADS-1; i >= 0; --i) {
SDL_WaitThread(threads[i], NULL);
  83         }
  84         return(0);      /* Never reached */
  85 }