test/torturethread.c
author Sam Lantinga <slouken@libsdl.org>
Mon, 15 Apr 2002 07:41:47 +0000
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/* Simple test of the SDL threading code */
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#include <stdio.h>
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#include <stdlib.h>
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#include <signal.h>
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#include <string.h>
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#include "SDL.h"
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#include "SDL_thread.h"
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#define NUMTHREADS 10
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static char volatile time_for_threads_to_die[NUMTHREADS];
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int SubThreadFunc(void *data) {
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	while(! *(int volatile *)data) {
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		; /*SDL_Delay(10); /* do nothing */
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	}
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	return 0;
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}
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int ThreadFunc(void *data) {
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	SDL_Thread *sub_threads[NUMTHREADS];
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	int flags[NUMTHREADS];
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	int i;
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	int tid = (int ) data;
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	fprintf(stderr, "Creating Thread %d\n", tid);
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	for(i = 0; i < NUMTHREADS; i++) {
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		flags[i] = 0;
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		sub_threads[i] = SDL_CreateThread(SubThreadFunc, &flags[i]);
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	}
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	printf("Thread '%d' waiting for signal\n", tid);
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	while(time_for_threads_to_die[tid] != 1) {
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		; /* do nothing */
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	}
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	printf("Thread '%d' sending signals to subthreads\n", tid);
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	for(i = 0; i <  NUMTHREADS; i++) {
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		flags[i] = 1;
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		SDL_WaitThread(sub_threads[i], NULL);
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	}
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	printf("Thread '%d' exiting!\n", tid);
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	return 0;
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}
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int main(int argc, char *argv[])
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{
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	SDL_Thread *threads[NUMTHREADS];
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	int i;
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	/* Load the SDL library */
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	if ( SDL_Init(0) < 0 ) {
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		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
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		exit(1);
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	}
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	atexit(SDL_Quit);
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	signal(SIGSEGV, SIG_DFL);
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	for(i = 0; i < NUMTHREADS; i++) {
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		time_for_threads_to_die[i] = 0;
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		threads[i] = SDL_CreateThread(ThreadFunc, (void *) i);
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		if ( threads[i] == NULL ) {
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			fprintf(stderr,
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			"Couldn't create thread: %s\n", SDL_GetError());
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			exit(1);
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		}
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	}
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	for(i = 0; i < NUMTHREADS; i++) {
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		time_for_threads_to_die[i] = 1;
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	}
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	for(i = NUMTHREADS-1; i >= 0; --i) {
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		SDL_WaitThread(threads[i], NULL);
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	}
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	return(0);	/* Never reached */
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}