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annotate test/testsem.c @ 5004:0c72ae7b7cb2

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Added native atomic operations for Windows, Mac OS X, and gcc compiler intrinsics. Changed the CAS return value to bool, so it's efficient with OSAtomicCompareAndSwap32Barrier() Added an atomic test adapted from code by Michael Davidsaver
author Sam Lantinga <slouken@libsdl.org>
date Sun, 16 Jan 2011 15:16:39 -0800
parents c121d94672cb
children d547877e355e
rev   line source
0
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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
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17 ThreadFunc(void *data)
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18 {
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19 int threadnum = (int) (uintptr_t) data;
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20 while (alive) {
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21 SDL_SemWait(sem);
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22 fprintf(stderr,
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23 "Thread number %d has got the semaphore (value = %d)!\n",
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24 threadnum, SDL_SemValue(sem));
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25 SDL_Delay(200);
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26 SDL_SemPost(sem);
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27 fprintf(stderr,
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28 "Thread number %d has released the semaphore (value = %d)!\n",
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29 threadnum, SDL_SemValue(sem));
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30 SDL_Delay(1); /* For the scheduler */
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31 }
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32 printf("Thread number %d exiting.\n", threadnum);
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33 return 0;
0
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34 }
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35
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36 static void
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37 killed(int sig)
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38 {
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39 alive = 0;
0
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40 }
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41
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42 int
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43 main(int argc, char **argv)
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44 {
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45 SDL_Thread *threads[NUM_THREADS];
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46 uintptr_t i;
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47 int init_sem;
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48
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49 if (argc < 2) {
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50 fprintf(stderr, "Usage: %s init_value\n", argv[0]);
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51 return (1);
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52 }
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53
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54 /* Load the SDL library */
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55 if (SDL_Init(0) < 0) {
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56 fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
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57 return (1);
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58 }
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59 signal(SIGTERM, killed);
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60 signal(SIGINT, killed);
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61
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62 init_sem = atoi(argv[1]);
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63 sem = SDL_CreateSemaphore(init_sem);
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64
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65 printf("Running %d threads, semaphore value = %d\n", NUM_THREADS,
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66 init_sem);
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67 /* Create all the threads */
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68 for (i = 0; i < NUM_THREADS; ++i) {
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69 threads[i] = SDL_CreateThread(ThreadFunc, (void *) i);
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70 }
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71
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72 /* Wait 10 seconds */
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73 SDL_Delay(10 * 1000);
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74
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75 /* Wait for all threads to finish */
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76 printf("Waiting for threads to finish\n");
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77 alive = 0;
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78 for (i = 0; i < NUM_THREADS; ++i) {
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79 SDL_WaitThread(threads[i], NULL);
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80 }
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81 printf("Finished waiting for threads\n");
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82
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83 SDL_DestroySemaphore(sem);
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84 SDL_Quit();
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85 return (0);
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86 }