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annotate test/testlock.c @ 1670:eef792d31de8 SDL-1.3

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Work in progress. :)
author Sam Lantinga <slouken@libsdl.org>
date Wed, 07 Jun 2006 16:10:28 +0000
parents 4da1ee79c9af
children
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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 for (i = 0; i < 6; ++i)
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48 SDL_KillThread(threads[i]);
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49 SDL_DestroyMutex(mutex);
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50 exit(sig);
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51 }
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52
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53 int SDLCALL
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54 Run(void *data)
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55 {
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56 if (SDL_ThreadID() == mainthread)
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57 signal(SIGTERM, closemutex);
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58 while (1) {
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59 printf("Process %u ready to work\n", SDL_ThreadID());
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60 if (SDL_mutexP(mutex) < 0) {
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61 fprintf(stderr, "Couldn't lock mutex: %s", SDL_GetError());
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62 exit(1);
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63 }
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64 printf("Process %u, working!\n", SDL_ThreadID());
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65 SDL_Delay(1 * 1000);
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66 printf("Process %u, done!\n", SDL_ThreadID());
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67 if (SDL_mutexV(mutex) < 0) {
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68 fprintf(stderr, "Couldn't unlock mutex: %s", SDL_GetError());
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69 exit(1);
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70 }
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71 /* If this sleep isn't done, then threads may starve */
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72 SDL_Delay(10);
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73 if (SDL_ThreadID() == mainthread && doterminate) {
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74 printf("Process %u: raising SIGTERM\n", SDL_ThreadID());
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75 raise(SIGTERM);
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76 }
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77 }
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78 return (0);
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79 }
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80
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81 int
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82 main(int argc, char *argv[])
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83 {
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84 int i;
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85 int maxproc = 6;
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86
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87 /* Load the SDL library */
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88 if (SDL_Init(0) < 0) {
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89 fprintf(stderr, "%s\n", SDL_GetError());
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90 exit(1);
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91 }
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92 atexit(SDL_Quit_Wrapper);
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93
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94 if ((mutex = SDL_CreateMutex()) == NULL) {
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95 fprintf(stderr, "Couldn't create mutex: %s\n", SDL_GetError());
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96 exit(1);
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97 }
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98
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99 mainthread = SDL_ThreadID();
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100 printf("Main thread: %u\n", mainthread);
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101 atexit(printid);
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102 for (i = 0; i < maxproc; ++i) {
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103 if ((threads[i] = SDL_CreateThread(Run, NULL)) == NULL)
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104 fprintf(stderr, "Couldn't create thread!\n");
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105 }
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106 signal(SIGINT, terminate);
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107 Run(NULL);
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108
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109 return (0); /* Never reached */
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110 }