torturethread.c
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/* Simple test of the SDL threading code */
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include "SDL.h"
#include "SDL_thread.h"
#define NUMTHREADS 10
static char volatile time_for_threads_to_die[NUMTHREADS];
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/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
static void quit(int rc)
{
SDL_Quit();
exit(rc);
}
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int SubThreadFunc(void *data) {
while(! *(int volatile *)data) {
; /*SDL_Delay(10); /* do nothing */
}
return 0;
}
int ThreadFunc(void *data) {
SDL_Thread *sub_threads[NUMTHREADS];
int flags[NUMTHREADS];
int i;
int tid = (int ) data;
fprintf(stderr, "Creating Thread %d\n", tid);
for(i = 0; i < NUMTHREADS; i++) {
flags[i] = 0;
sub_threads[i] = SDL_CreateThread(SubThreadFunc, &flags[i]);
}
printf("Thread '%d' waiting for signal\n", tid);
while(time_for_threads_to_die[tid] != 1) {
; /* do nothing */
}
printf("Thread '%d' sending signals to subthreads\n", tid);
for(i = 0; i < NUMTHREADS; i++) {
flags[i] = 1;
SDL_WaitThread(sub_threads[i], NULL);
}
printf("Thread '%d' exiting!\n", tid);
return 0;
}
int main(int argc, char *argv[])
{
SDL_Thread *threads[NUMTHREADS];
int i;
/* Load the SDL library */
if ( SDL_Init(0) < 0 ) {
fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
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}
signal(SIGSEGV, SIG_DFL);
for(i = 0; i < NUMTHREADS; i++) {
time_for_threads_to_die[i] = 0;
threads[i] = SDL_CreateThread(ThreadFunc, (void *) i);
if ( threads[i] == NULL ) {
fprintf(stderr,
"Couldn't create thread: %s\n", SDL_GetError());
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}
}
for(i = 0; i < NUMTHREADS; i++) {
time_for_threads_to_die[i] = 1;
}
for(i = NUMTHREADS-1; i >= 0; --i) {
SDL_WaitThread(threads[i], NULL);
}
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SDL_Quit();
return(0);