| 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 | |
| 9 | #include "SDL.h" |
| 10 | #include "SDL_mutex.h" |
| 11 | #include "SDL_thread.h" |
| 12 | |
| 13 | static SDL_mutex *mutex = NULL; |
| 14 | static Uint32 mainthread; |
| 15 | static SDL_Thread *threads[6]; |
| 16 | static volatile int doterminate = 0; |
| 17 | |
| 18 | /* |
| 19 | * SDL_Quit() shouldn't be used with atexit() directly because |
| 20 | * calling conventions may differ... |
| 21 | */ |
| 22 | static void SDL_Quit_Wrapper(void) |
| 23 | { |
| 24 | SDL_Quit(); |
| 25 | } |
| 26 | |
| 27 | void printid(void) |
| 28 | { |
| 29 | printf("Process %u: exiting\n", SDL_ThreadID()); |
| 30 | } |
| 31 | |
| 32 | void terminate(int sig) |
| 33 | { |
| 34 | signal(SIGINT, terminate); |
| 35 | doterminate = 1; |
| 36 | } |
| 37 | void closemutex(int sig) |
| 38 | { |
| 39 | Uint32 id = SDL_ThreadID(); |
| 40 | int i; |
| 41 | printf("Process %u: Cleaning up...\n", id == mainthread ? 0 : id); |
| 42 | for ( i=0; i<6; ++i ) |
| 43 | SDL_KillThread(threads[i]); |
| 44 | SDL_DestroyMutex(mutex); |
| 45 | exit(sig); |
| 46 | } |
| 47 | int SDLCALL Run(void *data) |
| 48 | { |
| 49 | if ( SDL_ThreadID() == mainthread ) |
| 50 | signal(SIGTERM, closemutex); |
| 51 | while ( 1 ) { |
| 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()); |
| 55 | exit(1); |
| 56 | } |
| 57 | printf("Process %u, working!\n", SDL_ThreadID()); |
| 58 | SDL_Delay(1*1000); |
| 59 | printf("Process %u, done!\n", SDL_ThreadID()); |
| 60 | if ( SDL_mutexV(mutex) < 0 ) { |
| 61 | fprintf(stderr, "Couldn't unlock mutex: %s", SDL_GetError()); |
| 62 | exit(1); |
| 63 | } |
| 64 | /* If this sleep isn't done, then threads may starve */ |
| 65 | SDL_Delay(10); |
| 66 | if (SDL_ThreadID() == mainthread && doterminate) { |
| 67 | printf("Process %u: raising SIGTERM\n", SDL_ThreadID()); |
| 68 | raise(SIGTERM); |
| 69 | } |
| 70 | } |
| 71 | return(0); |
| 72 | } |
| 73 | |
| 74 | int main(int argc, char *argv[]) |
| 75 | { |
| 76 | int i; |
| 77 | int maxproc = 6; |
| 78 | |
| 79 | /* Load the SDL library */ |
| 80 | if ( SDL_Init(0) < 0 ) { |
| 81 | fprintf(stderr, "%s\n", SDL_GetError()); |
| 82 | exit(1); |
| 83 | } |
| 84 | atexit(SDL_Quit_Wrapper); |
| 85 | |
| 86 | if ( (mutex=SDL_CreateMutex()) == NULL ) { |
| 87 | fprintf(stderr, "Couldn't create mutex: %s\n", SDL_GetError()); |
| 88 | exit(1); |
| 89 | } |
| 90 | |
| 91 | mainthread = SDL_ThreadID(); |
| 92 | printf("Main thread: %u\n", mainthread); |
| 93 | atexit(printid); |
| 94 | for ( i=0; i<maxproc; ++i ) { |
| 95 | if ( (threads[i]=SDL_CreateThread(Run, NULL)) == NULL ) |
| 96 | fprintf(stderr, "Couldn't create thread!\n"); |
| 97 | } |
| 98 | signal(SIGINT, terminate); |
| 99 | Run(NULL); |
| 100 | |
| 101 | return(0); /* Never reached */ |
| 102 | } |