test/torturethread.c
author Edgar Simo <bobbens@gmail.com>
Mon, 04 Aug 2008 17:30:17 +0000
branchgsoc2008_force_feedback
changeset 2592 8152dd46fbe2
parent 1895 c121d94672cb
child 5535 96594ac5fd1a
permissions -rw-r--r--
Changed effect comparison a bit.
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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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/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
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static void
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quit(int rc)
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{
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    SDL_Quit();
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    exit(rc);
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}
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int SDLCALL
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SubThreadFunc(void *data)
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{
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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 SDLCALL
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ThreadFunc(void *data)
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{
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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) (uintptr_t) 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
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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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        return (1);
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    }
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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 *) (uintptr_t) i);
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        if (threads[i] == NULL) {
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            fprintf(stderr, "Couldn't create thread: %s\n", SDL_GetError());
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            quit(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 = 0; i < NUMTHREADS; i++) {
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        SDL_WaitThread(threads[i], NULL);
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    }
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    SDL_Quit();
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    return (0);
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}