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annotate test/testsem.c @ 2349:0381047f2210 gsoc2008_iphone

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The class SDL_uikitappdelegate acts as the UIApplicationDelegate for an iPhone SDL project. This class is reponsible for application control flow, including initial setup of working directory, forwarding command line arguments to the user's main function, and handling application termination.
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Thu, 17 Jul 2008 22:29:37 +0000
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 }