1 /*
2 Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
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
24 static 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. */
27 static void
quit(int rc)28 quit(int rc)
29 {
30 SDL_Quit();
31 exit(rc);
32 }
33
34 int SDLCALL
SubThreadFunc(void * data)35 SubThreadFunc(void *data)
36 {
37 while (!*(int volatile *) data) {
38 ; /* SDL_Delay(10); *//* do nothing */
39 }
40 return 0;
41 }
42
43 int SDLCALL
ThreadFunc(void * data)44 ThreadFunc(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
76 int
main(int argc,char * argv[])77 main(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