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annotate test/testsem.c @ 5266:595814f561f7

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There is only one width and height for the window. If those are changed during the course of a fullscreen mode change, then they'll stay that size when returning to windowed mode.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 11 Feb 2011 20:49:13 -0800
parents d547877e355e
children
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 static void
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43 TestWaitTimeout(void)
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44 {
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45 Uint32 start_ticks;
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46 Uint32 end_ticks;
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47 Uint32 duration;
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48
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49 sem = SDL_CreateSemaphore(0);
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50 printf("Waiting 2 seconds on semaphore\n");
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51
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52 start_ticks = SDL_GetTicks();
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53 SDL_SemWaitTimeout(sem, 2000);
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54 end_ticks = SDL_GetTicks();
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55
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56 duration = end_ticks - start_ticks;
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57
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58 /* Accept a little offset in the effective wait */
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59 if (duration > 1900 && duration < 2050)
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60 printf("Wait done.\n");
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61 else
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62 fprintf(stderr, "Wait took %d milliseconds\n", duration);
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63 }
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64
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65 int
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66 main(int argc, char **argv)
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67 {
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68 SDL_Thread *threads[NUM_THREADS];
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69 uintptr_t i;
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70 int init_sem;
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71
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72 if (argc < 2) {
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73 fprintf(stderr, "Usage: %s init_value\n", argv[0]);
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74 return (1);
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75 }
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76
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77 /* Load the SDL library */
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78 if (SDL_Init(0) < 0) {
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79 fprintf(stderr, "Couldn't initialize SDL: %s\n", SDL_GetError());
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80 return (1);
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81 }
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82 signal(SIGTERM, killed);
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83 signal(SIGINT, killed);
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84
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85 init_sem = atoi(argv[1]);
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86 sem = SDL_CreateSemaphore(init_sem);
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87
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88 printf("Running %d threads, semaphore value = %d\n", NUM_THREADS,
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89 init_sem);
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90 /* Create all the threads */
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91 for (i = 0; i < NUM_THREADS; ++i) {
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92 threads[i] = SDL_CreateThread(ThreadFunc, (void *) i);
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93 }
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94
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95 /* Wait 10 seconds */
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96 SDL_Delay(10 * 1000);
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97
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98 /* Wait for all threads to finish */
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99 printf("Waiting for threads to finish\n");
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100 alive = 0;
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101 for (i = 0; i < NUM_THREADS; ++i) {
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102 SDL_WaitThread(threads[i], NULL);
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103 }
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104 printf("Finished waiting for threads\n");
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105
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106 SDL_DestroySemaphore(sem);
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107
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108 TestWaitTimeout();
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109
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110 SDL_Quit();
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111 return (0);
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112 }