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annotate test/testlock.c @ 3070:3e3724fb829e

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Fixed bug #681 Description From Philipp 2009-01-16 20:50:01 (-) [reply] The File test/README from the svn says this: testgl A very simple example of using OpenGL with SDL testgl2 Improved version of testgl It is actually exchanged. testgl.c is the improved version right now and testgl2.c the simple one.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 17 Feb 2009 05:44:49 +0000
parents 4436464c4f51
children 0d1b16ee0bca
rev   line source
0
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1
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2 /* Test the thread and mutex locking functions
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3 Also exercises the system's signal/thread interaction
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4 */
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5
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6 #include <signal.h>
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7 #include <stdio.h>
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8
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9 #include "SDL.h"
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10 #include "SDL_mutex.h"
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11 #include "SDL_thread.h"
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12
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13 static SDL_mutex *mutex = NULL;
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14 static Uint32 mainthread;
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15 static SDL_Thread *threads[6];
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16 static volatile int doterminate = 0;
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17
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18 /*
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19 * SDL_Quit() shouldn't be used with atexit() directly because
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20 * calling conventions may differ...
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21 */
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22 static void
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23 SDL_Quit_Wrapper(void)
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24 {
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25 SDL_Quit();
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26 }
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27
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28 void
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29 printid(void)
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30 {
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31 printf("Process %u: exiting\n", SDL_ThreadID());
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32 }
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33
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34 void
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35 terminate(int sig)
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36 {
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37 signal(SIGINT, terminate);
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38 doterminate = 1;
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39 }
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40
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41 void
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42 closemutex(int sig)
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43 {
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44 Uint32 id = SDL_ThreadID();
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45 int i;
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46 printf("Process %u: Cleaning up...\n", id == mainthread ? 0 : id);
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47 doterminate = 1;
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48 for (i = 0; i < 6; ++i)
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49 SDL_WaitThread(threads[i], NULL);
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50 SDL_DestroyMutex(mutex);
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51 exit(sig);
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52 }
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53
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54 int SDLCALL
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55 Run(void *data)
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56 {
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57 if (SDL_ThreadID() == mainthread)
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58 signal(SIGTERM, closemutex);
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59 while (!doterminate) {
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60 printf("Process %u ready to work\n", SDL_ThreadID());
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61 if (SDL_mutexP(mutex) < 0) {
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62 fprintf(stderr, "Couldn't lock mutex: %s", SDL_GetError());
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63 exit(1);
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64 }
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65 printf("Process %u, working!\n", SDL_ThreadID());
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66 SDL_Delay(1 * 1000);
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67 printf("Process %u, done!\n", SDL_ThreadID());
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68 if (SDL_mutexV(mutex) < 0) {
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69 fprintf(stderr, "Couldn't unlock mutex: %s", SDL_GetError());
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70 exit(1);
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71 }
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72 /* If this sleep isn't done, then threads may starve */
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73 SDL_Delay(10);
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74 }
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75 if (SDL_ThreadID() == mainthread && doterminate) {
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76 printf("Process %u: raising SIGTERM\n", SDL_ThreadID());
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77 raise(SIGTERM);
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78 }
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79 return (0);
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80 }
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81
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82 int
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83 main(int argc, char *argv[])
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84 {
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85 int i;
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86 int maxproc = 6;
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87
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88 /* Load the SDL library */
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89 if (SDL_Init(0) < 0) {
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90 fprintf(stderr, "%s\n", SDL_GetError());
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91 exit(1);
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92 }
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93 atexit(SDL_Quit_Wrapper);
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94
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95 if ((mutex = SDL_CreateMutex()) == NULL) {
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96 fprintf(stderr, "Couldn't create mutex: %s\n", SDL_GetError());
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97 exit(1);
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98 }
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99
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100 mainthread = SDL_ThreadID();
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101 printf("Main thread: %u\n", mainthread);
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102 atexit(printid);
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103 for (i = 0; i < maxproc; ++i) {
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104 if ((threads[i] = SDL_CreateThread(Run, NULL)) == NULL)
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105 fprintf(stderr, "Couldn't create thread!\n");
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106 }
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107 signal(SIGINT, terminate);
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108 Run(NULL);
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109
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110 return (0); /* Never reached */
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111 }