/
testlock.c
128 lines (111 loc) · 3.3 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
/*
Copyright (C) 1997-2013 Sam Lantinga <slouken@libsdl.org>
This software is provided 'as-is', without any express or implied
warranty. In no event will the authors be held liable for any damages
arising from the use of this software.
Permission is granted to anyone to use this software for any purpose,
including commercial applications, and to alter it and redistribute it
freely.
*/
/* Test the thread and mutex locking functions
Also exercises the system's signal/thread interaction
*/
#include <signal.h>
#include <stdio.h>
#include <stdlib.h> /* for atexit() */
#include "SDL.h"
#include "SDL_mutex.h"
#include "SDL_thread.h"
static SDL_mutex *mutex = NULL;
static SDL_threadID mainthread;
static SDL_Thread *threads[6];
static volatile int doterminate = 0;
/*
* SDL_Quit() shouldn't be used with atexit() directly because
* calling conventions may differ...
*/
static void
SDL_Quit_Wrapper(void)
{
SDL_Quit();
}
void
printid(void)
{
43
SDL_Log("Process %lu: exiting\n", SDL_ThreadID());
44
45
46
47
48
49
50
51
52
53
54
55
56
57
}
void
terminate(int sig)
{
signal(SIGINT, terminate);
doterminate = 1;
}
void
closemutex(int sig)
{
SDL_threadID id = SDL_ThreadID();
int i;
58
SDL_Log("Process %lu: Cleaning up...\n", id == mainthread ? 0 : id);
59
60
61
62
63
64
65
66
67
68
69
70
71
doterminate = 1;
for (i = 0; i < 6; ++i)
SDL_WaitThread(threads[i], NULL);
SDL_DestroyMutex(mutex);
exit(sig);
}
int SDLCALL
Run(void *data)
{
if (SDL_ThreadID() == mainthread)
signal(SIGTERM, closemutex);
while (!doterminate) {
72
SDL_Log("Process %lu ready to work\n", SDL_ThreadID());
73
if (SDL_LockMutex(mutex) < 0) {
74
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't lock mutex: %s", SDL_GetError());
75
76
exit(1);
}
77
SDL_Log("Process %lu, working!\n", SDL_ThreadID());
78
SDL_Delay(1 * 1000);
79
SDL_Log("Process %lu, done!\n", SDL_ThreadID());
80
if (SDL_UnlockMutex(mutex) < 0) {
81
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't unlock mutex: %s", SDL_GetError());
82
83
84
85
86
87
exit(1);
}
/* If this sleep isn't done, then threads may starve */
SDL_Delay(10);
}
if (SDL_ThreadID() == mainthread && doterminate) {
88
SDL_Log("Process %lu: raising SIGTERM\n", SDL_ThreadID());
89
90
91
92
93
94
95
96
97
98
99
raise(SIGTERM);
}
return (0);
}
int
main(int argc, char *argv[])
{
int i;
int maxproc = 6;
100
101
102
/* Enable standard application logging */
SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
103
104
/* Load the SDL library */
if (SDL_Init(0) < 0) {
105
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "%s\n", SDL_GetError());
106
107
108
109
110
exit(1);
}
atexit(SDL_Quit_Wrapper);
if ((mutex = SDL_CreateMutex()) == NULL) {
111
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create mutex: %s\n", SDL_GetError());
112
113
114
115
exit(1);
}
mainthread = SDL_ThreadID();
116
SDL_Log("Main thread: %lu\n", mainthread);
117
118
119
120
121
atexit(printid);
for (i = 0; i < maxproc; ++i) {
char name[64];
SDL_snprintf(name, sizeof (name), "Worker%d", i);
if ((threads[i] = SDL_CreateThread(Run, name, NULL)) == NULL)
122
SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create thread!\n");
123
124
125
126
127
128
}
signal(SIGINT, terminate);
Run(NULL);
return (0); /* Never reached */
}