0
|
1 |
|
|
2 |
/* Test the thread and mutex locking functions
|
|
3 |
Also exercises the system's signal/thread interaction
|
|
4 |
*/
|
|
5 |
|
|
6 |
#include <signal.h>
|
|
7 |
#include <stdio.h>
|
|
8 |
#include <stdlib.h>
|
|
9 |
|
|
10 |
#include "SDL.h"
|
|
11 |
#include "SDL_mutex.h"
|
|
12 |
#include "SDL_thread.h"
|
|
13 |
|
|
14 |
static SDL_mutex *mutex = NULL;
|
|
15 |
static Uint32 mainthread;
|
|
16 |
static SDL_Thread *threads[6];
|
|
17 |
|
|
18 |
void printid(void)
|
|
19 |
{
|
|
20 |
printf("Process %u: exiting\n", SDL_ThreadID());
|
|
21 |
}
|
|
22 |
|
|
23 |
void terminate(int sig)
|
|
24 |
{
|
|
25 |
printf("Process %u: raising SIGTERM\n", SDL_ThreadID());
|
|
26 |
raise(SIGTERM);
|
|
27 |
}
|
|
28 |
void closemutex(int sig)
|
|
29 |
{
|
|
30 |
Uint32 id = SDL_ThreadID();
|
|
31 |
int i;
|
|
32 |
printf("Process %u: Cleaning up...\n", id == mainthread ? 0 : id);
|
|
33 |
for ( i=0; i<6; ++i )
|
|
34 |
SDL_KillThread(threads[i]);
|
|
35 |
SDL_DestroyMutex(mutex);
|
|
36 |
exit(sig);
|
|
37 |
}
|
|
38 |
int Run(void *data)
|
|
39 |
{
|
|
40 |
if ( SDL_ThreadID() == mainthread )
|
|
41 |
signal(SIGTERM, closemutex);
|
|
42 |
while ( 1 ) {
|
|
43 |
printf("Process %u ready to work\n", SDL_ThreadID());
|
|
44 |
if ( SDL_mutexP(mutex) < 0 ) {
|
|
45 |
fprintf(stderr, "Couldn't lock mutex: %s", SDL_GetError());
|
|
46 |
exit(1);
|
|
47 |
}
|
|
48 |
printf("Process %u, working!\n", SDL_ThreadID());
|
|
49 |
SDL_Delay(1*1000);
|
|
50 |
printf("Process %u, done!\n", SDL_ThreadID());
|
|
51 |
if ( SDL_mutexV(mutex) < 0 ) {
|
|
52 |
fprintf(stderr, "Couldn't unlock mutex: %s", SDL_GetError());
|
|
53 |
exit(1);
|
|
54 |
}
|
|
55 |
/* If this sleep isn't done, then threads may starve */
|
|
56 |
SDL_Delay(10);
|
|
57 |
}
|
|
58 |
return(0);
|
|
59 |
}
|
|
60 |
|
|
61 |
int main(int argc, char *argv[])
|
|
62 |
{
|
|
63 |
int i;
|
|
64 |
int maxproc = 6;
|
|
65 |
|
|
66 |
/* Load the SDL library */
|
|
67 |
if ( SDL_Init(0) < 0 ) {
|
|
68 |
fprintf(stderr, "%s\n", SDL_GetError());
|
|
69 |
exit(1);
|
|
70 |
}
|
|
71 |
atexit(SDL_Quit);
|
|
72 |
|
|
73 |
if ( (mutex=SDL_CreateMutex()) == NULL ) {
|
|
74 |
fprintf(stderr, "Couldn't create mutex: %s\n", SDL_GetError());
|
|
75 |
exit(1);
|
|
76 |
}
|
|
77 |
|
|
78 |
mainthread = SDL_ThreadID();
|
|
79 |
printf("Main thread: %u\n", mainthread);
|
|
80 |
atexit(printid);
|
|
81 |
for ( i=0; i<maxproc; ++i ) {
|
|
82 |
if ( (threads[i]=SDL_CreateThread(Run, NULL)) == NULL )
|
|
83 |
fprintf(stderr, "Couldn't create thread!\n");
|
|
84 |
}
|
|
85 |
signal(SIGINT, terminate);
|
|
86 |
Run(NULL);
|
|
87 |
|
|
88 |
return(0); /* Never reached */
|
|
89 |
}
|