Atlas - torturethread.c
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[FILE BEGIN]
1/*
2  Copyright (C) 1997-2018 Sam Lantinga <[email protected]>
3
4  This software is provided 'as-is', without any express or implied
5  warranty.  In no event will the authors be held liable for any damages
6  arising from the use of this software.
7
8  Permission is granted to anyone to use this software for any purpose,
9  including commercial applications, and to alter it and redistribute it
10  freely.
11*/
12
13/* Simple test of the SDL threading code */
14
15#include <stdio.h>
16#include <stdlib.h>
17#include <signal.h>
18#include <string.h>
19
20#include "SDL.h"
21
22#define NUMTHREADS 10
23
24static SDL_atomic_t time_for_threads_to_die[NUMTHREADS];
25
26/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
27static void
28quit(int rc)
29{
30    SDL_Quit();
31    exit(rc);
32}
33
34int SDLCALL
35SubThreadFunc(void *data)
36{
37    while (!*(int volatile *) data) {
38        ;                       /* SDL_Delay(10); *//* do nothing */
39    }
40    return 0;
41}
42
43int SDLCALL
44ThreadFunc(void *data)
45{
46    SDL_Thread *sub_threads[NUMTHREADS];
47    int flags[NUMTHREADS];
48    int i;
49    int tid = (int) (uintptr_t) data;
50
51    SDL_Log("Creating Thread %d\n", tid);
52
53    for (i = 0; i < NUMTHREADS; i++) {
54        char name[64];
55        SDL_snprintf(name, sizeof (name), "Child%d_%d", tid, i);
56        flags[i] = 0;
57        sub_threads[i] = SDL_CreateThread(SubThreadFunc, name, &flags[i]);
58    }
59
60    SDL_Log("Thread '%d' waiting for signal\n", tid);
61    while (SDL_AtomicGet(&time_for_threads_to_die[tid]) != 1) {
62        ;                       /* do nothing */
63    }
64
65    SDL_Log("Thread '%d' sending signals to subthreads\n", tid);
66    for (i = 0; i < NUMTHREADS; i++) {
67        flags[i] = 1;
68        SDL_WaitThread(sub_threads[i], NULL);
69    }
70
71    SDL_Log("Thread '%d' exiting!\n", tid);
72
73    return 0;
74}
75
76int
77main(int argc, char *argv[])
78{
79    SDL_Thread *threads[NUMTHREADS];
80    int i;
81
82    /* Enable standard application logging */
83    SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
84
85    /* Load the SDL library */
86    if (SDL_Init(0) < 0) {
87        SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
88        return (1);
89    }
90
91    signal(SIGSEGV, SIG_DFL);
92    for (i = 0; i < NUMTHREADS; i++) {
93        char name[64];
94        SDL_snprintf(name, sizeof (name), "Parent%d", i);
95        SDL_AtomicSet(&time_for_threads_to_die[i], 0);
96        threads[i] = SDL_CreateThread(ThreadFunc, name, (void*) (uintptr_t) i);
97
98        if (threads[i] == NULL) {
99            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create thread: %s\n", SDL_GetError());
100            quit(1);
101        }
102    }
103
104    for (i = 0; i < NUMTHREADS; i++) {
105        SDL_AtomicSet(&time_for_threads_to_die[i], 1);
106    }
107
108    for (i = 0; i < NUMTHREADS; i++) {
109        SDL_WaitThread(threads[i], NULL);
110    }
111    SDL_Quit();
112    return (0);
113}
114
[FILE END]
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