annotate test/testsem.c @ 1782:23fe15f88c03

(none)
author Sam Lantinga <slouken@libsdl.org>
date Mon, 08 May 2006 06:23:11 +0000
parents 290b5baf2fca
children 782fd950bd46 c121d94672cb 99acf3d856cb
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1
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2 /* Simple test of the SDL semaphore code */
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3
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4 #include <stdio.h>
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5 #include <stdlib.h>
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6 #include <signal.h>
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7
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8 #include "SDL.h"
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9 #include "SDL_thread.h"
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10
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11 #define NUM_THREADS 10
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12
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13 static SDL_sem *sem;
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14 int alive = 1;
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15
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16 int SDLCALL ThreadFunc(void *data)
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17 {
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18 int threadnum = (int)(uintptr_t)data;
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19 while ( alive ) {
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20 SDL_SemWait(sem);
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21 fprintf(stderr, "Thread number %d has got the semaphore (value = %d)!\n", threadnum, SDL_SemValue(sem));
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22 SDL_Delay(200);
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23 SDL_SemPost(sem);
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24 fprintf(stderr, "Thread number %d has released the semaphore (value = %d)!\n", threadnum, SDL_SemValue(sem));
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25 SDL_Delay(1); /* For the scheduler */
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26 }
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27 printf("Thread number %d exiting.\n", threadnum);
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28 return 0;
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29 }
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30
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31 static void killed(int sig)
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32 {
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33 alive = 0;
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34 }
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35
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36 int main(int argc, char **argv)
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37 {
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38 SDL_Thread *threads[NUM_THREADS];
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39 uintptr_t i;
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40 int init_sem;
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41
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42 if(argc < 2) {
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43 fprintf(stderr,"Usage: %s init_value\n", argv[0]);
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44 return(1);
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45 }
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46
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47 /* Load the SDL library */
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48 if ( SDL_Init(0) < 0 ) {
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49 fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
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50 return(1);
0
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51 }
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52 signal(SIGTERM, killed);
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53 signal(SIGINT, killed);
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54
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55 init_sem = atoi(argv[1]);
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56 sem = SDL_CreateSemaphore(init_sem);
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57
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58 printf("Running %d threads, semaphore value = %d\n", NUM_THREADS, init_sem);
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59 /* Create all the threads */
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60 for( i = 0; i < NUM_THREADS; ++i ) {
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61 threads[i] = SDL_CreateThread(ThreadFunc, (void*)i);
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62 }
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63
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64 /* Wait 10 seconds */
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65 SDL_Delay(10 * 1000);
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66
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67 /* Wait for all threads to finish */
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68 printf("Waiting for threads to finish\n");
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69 alive = 0;
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70 for( i = 0; i < NUM_THREADS; ++i ) {
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71 SDL_WaitThread(threads[i], NULL);
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72 }
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73 printf("Finished waiting for threads\n");
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74
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75 SDL_DestroySemaphore(sem);
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76 SDL_Quit();
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77 return(0);
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78 }