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