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annotate test/testsem.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents 14717b52abc0
children 4da1ee79c9af
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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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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 }