2 /* Test the thread and mutex locking functions
3 Also exercises the system's signal/thread interaction
10 #include "SDL_mutex.h"
11 #include "SDL_thread.h"
13 static SDL_mutex *mutex = NULL;
14 static Uint32 mainthread;
15 static SDL_Thread *threads[6];
16 static volatile int doterminate = 0;
19 * SDL_Quit() shouldn't be used with atexit() directly because
20 * calling conventions may differ...
22 static void SDL_Quit_Wrapper(void)
29 printf("Process %u: exiting\n", SDL_ThreadID());
32 void terminate(int sig)
34 signal(SIGINT, terminate);
37 void closemutex(int sig)
39 Uint32 id = SDL_ThreadID();
41 printf("Process %u: Cleaning up...\n", id == mainthread ? 0 : id);
43 SDL_KillThread(threads[i]);
44 SDL_DestroyMutex(mutex);
47 int SDLCALL Run(void *data)
49 if ( SDL_ThreadID() == mainthread )
50 signal(SIGTERM, closemutex);
52 printf("Process %u ready to work\n", SDL_ThreadID());
53 if ( SDL_mutexP(mutex) < 0 ) {
54 fprintf(stderr, "Couldn't lock mutex: %s", SDL_GetError());
57 printf("Process %u, working!\n", SDL_ThreadID());
59 printf("Process %u, done!\n", SDL_ThreadID());
60 if ( SDL_mutexV(mutex) < 0 ) {
61 fprintf(stderr, "Couldn't unlock mutex: %s", SDL_GetError());
64 /* If this sleep isn't done, then threads may starve */
66 if (SDL_ThreadID() == mainthread && doterminate) {
67 printf("Process %u: raising SIGTERM\n", SDL_ThreadID());
74 int main(int argc, char *argv[])
79 /* Load the SDL library */
80 if ( SDL_Init(0) < 0 ) {
81 fprintf(stderr, "%s\n", SDL_GetError());
84 atexit(SDL_Quit_Wrapper);
86 if ( (mutex=SDL_CreateMutex()) == NULL ) {
87 fprintf(stderr, "Couldn't create mutex: %s\n", SDL_GetError());
91 mainthread = SDL_ThreadID();
92 printf("Main thread: %u\n", mainthread);
94 for ( i=0; i<maxproc; ++i ) {
95 if ( (threads[i]=SDL_CreateThread(Run, NULL)) == NULL )
96 fprintf(stderr, "Couldn't create thread!\n");
98 signal(SIGINT, terminate);
101 return(0); /* Never reached */