Atlas - torturethread.c
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[FILE BEGIN]
1/*
2  Copyright (C) 1997-2026 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 <stdlib.h>
16#include <signal.h>
17
18#include <SDL3/SDL.h>
19#include <SDL3/SDL_main.h>
20#include <SDL3/SDL_test.h>
21
22#ifdef SDL_PLATFORM_DOS
23#define NUMTHREADS 3  /* DOS cooperative scheduler has limited thread slots */
24#else
25#define NUMTHREADS 10
26#endif
27
28static SDL_AtomicInt time_for_threads_to_die[NUMTHREADS];
29
30/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
31static void
32quit(int rc)
33{
34    SDL_Quit();
35    /* Let 'main()' return normally */
36    if (rc != 0) {
37        exit(rc);
38    }
39}
40
41static int SDLCALL
42SubThreadFunc(void *data)
43{
44    SDL_AtomicInt *flag = (SDL_AtomicInt *)data;
45    while (!SDL_GetAtomicInt(flag)) {
46        SDL_Delay(10);
47    }
48    return 0;
49}
50
51static int SDLCALL
52ThreadFunc(void *data)
53{
54    SDL_Thread *sub_threads[NUMTHREADS];
55    SDL_AtomicInt flags[NUMTHREADS];
56    int i;
57    int tid = (int)(uintptr_t)data;
58
59    SDL_Log("Creating Thread %d", tid);
60
61    for (i = 0; i < NUMTHREADS; i++) {
62        char name[64];
63        (void)SDL_snprintf(name, sizeof(name), "Child%d_%d", tid, i);
64        SDL_SetAtomicInt(&flags[i], 0);
65        sub_threads[i] = SDL_CreateThread(SubThreadFunc, name, &flags[i]);
66    }
67
68    SDL_Log("Thread '%d' waiting for signal", tid);
69    while (SDL_GetAtomicInt(&time_for_threads_to_die[tid]) != 1) {
70#ifdef SDL_PLATFORM_DOS
71        SDL_Delay(0); /* Yield for cooperative threading */
72#endif
73    }
74
75    SDL_Log("Thread '%d' sending signals to subthreads", tid);
76    for (i = 0; i < NUMTHREADS; i++) {
77        SDL_SetAtomicInt(&flags[i], 1);
78        SDL_WaitThread(sub_threads[i], NULL);
79    }
80
81    SDL_Log("Thread '%d' exiting!", tid);
82
83    return 0;
84}
85
86int main(int argc, char *argv[])
87{
88    SDL_Thread *threads[NUMTHREADS];
89    int i;
90    SDLTest_CommonState *state;
91
92    /* Initialize test framework */
93    state = SDLTest_CommonCreateState(argv, 0);
94    if (!state) {
95        return 1;
96    }
97
98    if (!SDLTest_CommonDefaultArgs(state, argc, argv)) {
99        SDL_Quit();
100        SDLTest_CommonDestroyState(state);
101        return 1;
102    }
103
104    (void)signal(SIGSEGV, SIG_DFL);
105    for (i = 0; i < NUMTHREADS; i++) {
106        char name[64];
107        (void)SDL_snprintf(name, sizeof(name), "Parent%d", i);
108        SDL_SetAtomicInt(&time_for_threads_to_die[i], 0);
109        threads[i] = SDL_CreateThread(ThreadFunc, name, (void *)(uintptr_t)i);
110
111        if (threads[i] == NULL) {
112            SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create thread: %s", SDL_GetError());
113            quit(1);
114        }
115    }
116
117    for (i = 0; i < NUMTHREADS; i++) {
118        SDL_SetAtomicInt(&time_for_threads_to_die[i], 1);
119    }
120
121    for (i = 0; i < NUMTHREADS; i++) {
122        SDL_WaitThread(threads[i], NULL);
123    }
124    SDL_Quit();
125    SDLTest_CommonDestroyState(state);
126    return 0;
127}
128
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