This repository has been archived by the owner on Feb 11, 2021. It is now read-only.
testlock.c
1
2
3
4
5
6
7
8
9
10
11
12
/*
Copyright (C) 1997-2011 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.
*/
13
/* Test the thread and mutex locking functions
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
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
Also exercises the system's signal/thread interaction
*/
#include <signal.h>
#include <stdio.h>
#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)
{
printf("Process %lu: exiting\n", SDL_ThreadID());
}
void
terminate(int sig)
{
signal(SIGINT, terminate);
doterminate = 1;
}
void
closemutex(int sig)
{
SDL_threadID id = SDL_ThreadID();
int i;
printf("Process %lu: Cleaning up...\n", id == mainthread ? 0 : id);
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) {
printf("Process %lu ready to work\n", SDL_ThreadID());
72
if (SDL_LockMutex(mutex) < 0) {
73
74
75
76
77
78
fprintf(stderr, "Couldn't lock mutex: %s", SDL_GetError());
exit(1);
}
printf("Process %lu, working!\n", SDL_ThreadID());
SDL_Delay(1 * 1000);
printf("Process %lu, done!\n", SDL_ThreadID());
79
if (SDL_UnlockMutex(mutex) < 0) {
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
fprintf(stderr, "Couldn't unlock mutex: %s", SDL_GetError());
exit(1);
}
/* If this sleep isn't done, then threads may starve */
SDL_Delay(10);
}
if (SDL_ThreadID() == mainthread && doterminate) {
printf("Process %lu: raising SIGTERM\n", SDL_ThreadID());
raise(SIGTERM);
}
return (0);
}
int
main(int argc, char *argv[])
{
int i;
int maxproc = 6;
/* Load the SDL library */
if (SDL_Init(0) < 0) {
fprintf(stderr, "%s\n", SDL_GetError());
exit(1);
}
atexit(SDL_Quit_Wrapper);
if ((mutex = SDL_CreateMutex()) == NULL) {
fprintf(stderr, "Couldn't create mutex: %s\n", SDL_GetError());
exit(1);
}
mainthread = SDL_ThreadID();
printf("Main thread: %lu\n", mainthread);
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)
fprintf(stderr, "Couldn't create thread!\n");
}
signal(SIGINT, terminate);
Run(NULL);
return (0); /* Never reached */
}