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
19 #include "SDL.h"
20
21 static SDL_TLSID tls;
22 static int alive = 0;
23 static int testprio = 0;
24
25 /* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
26 static void
quit(int rc)27 quit(int rc)
28 {
29 SDL_Quit();
30 exit(rc);
31 }
32
33 static const char *
getprioritystr(SDL_ThreadPriority priority)34 getprioritystr(SDL_ThreadPriority priority)
35 {
36 switch(priority)
37 {
38 case SDL_THREAD_PRIORITY_LOW: return "SDL_THREAD_PRIORITY_LOW";
39 case SDL_THREAD_PRIORITY_NORMAL: return "SDL_THREAD_PRIORITY_NORMAL";
40 case SDL_THREAD_PRIORITY_HIGH: return "SDL_THREAD_PRIORITY_HIGH";
41 case SDL_THREAD_PRIORITY_TIME_CRITICAL: return "SDL_THREAD_PRIORITY_TIME_CRITICAL";
42 }
43
44 return "???";
45 }
46
47 int SDLCALL
ThreadFunc(void * data)48 ThreadFunc(void *data)
49 {
50 SDL_ThreadPriority prio = SDL_THREAD_PRIORITY_NORMAL;
51
52 SDL_TLSSet(tls, "baby thread", NULL);
53 SDL_Log("Started thread %s: My thread id is %lu, thread data = %s\n",
54 (char *) data, SDL_ThreadID(), (const char *)SDL_TLSGet(tls));
55 while (alive) {
56 SDL_Log("Thread '%s' is alive!\n", (char *) data);
57
58 if (testprio) {
59 SDL_Log("SDL_SetThreadPriority(%s):%d\n", getprioritystr(prio), SDL_SetThreadPriority(prio));
60 if (++prio > SDL_THREAD_PRIORITY_TIME_CRITICAL)
61 prio = SDL_THREAD_PRIORITY_LOW;
62 }
63
64 SDL_Delay(1 * 1000);
65 }
66 SDL_Log("Thread '%s' exiting!\n", (char *) data);
67 return (0);
68 }
69
70 static void
killed(int sig)71 killed(int sig)
72 {
73 SDL_Log("Killed with SIGTERM, waiting 5 seconds to exit\n");
74 SDL_Delay(5 * 1000);
75 alive = 0;
76 quit(0);
77 }
78
79 int
main(int argc,char * argv[])80 main(int argc, char *argv[])
81 {
82 int arg = 1;
83 SDL_Thread *thread;
84
85 /* Enable standard application logging */
86 SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
87
88 /* Load the SDL library */
89 if (SDL_Init(0) < 0) {
90 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't initialize SDL: %s\n", SDL_GetError());
91 return (1);
92 }
93
94 while (argv[arg] && *argv[arg] == '-') {
95 if (SDL_strcmp(argv[arg], "--prio") == 0) {
96 testprio = 1;
97 }
98 ++arg;
99 }
100
101 tls = SDL_TLSCreate();
102 SDL_assert(tls);
103 SDL_TLSSet(tls, "main thread", NULL);
104 SDL_Log("Main thread data initially: %s\n", (const char *)SDL_TLSGet(tls));
105
106 alive = 1;
107 thread = SDL_CreateThread(ThreadFunc, "One", "#1");
108 if (thread == NULL) {
109 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create thread: %s\n", SDL_GetError());
110 quit(1);
111 }
112 SDL_Delay(5 * 1000);
113 SDL_Log("Waiting for thread #1\n");
114 alive = 0;
115 SDL_WaitThread(thread, NULL);
116
117 SDL_Log("Main thread data finally: %s\n", (const char *)SDL_TLSGet(tls));
118
119 alive = 1;
120 signal(SIGTERM, killed);
121 thread = SDL_CreateThread(ThreadFunc, "Two", "#2");
122 if (thread == NULL) {
123 SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create thread: %s\n", SDL_GetError());
124 quit(1);
125 }
126 raise(SIGTERM);
127
128 SDL_Quit(); /* Never reached */
129 return (0); /* Never reached */
130 }
131