kc3-lang/SDL/test/testlock.c

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• Hash : b88ca1b4
  Author :
  Date : 2015-02-10T16:28:56
  

  the last parameter of XChangeProperty is the number of elements.. and when the element format is 32.. the element is "long" so we have 5 long elements here.
  
  Yes this seems confusing as on mac+linux Long is either 32 or 64bits depending on the architecture, but this is how the X11 protocol is defined. Thus 5 is the correct value for the nelts here.  Not 5 or 10 depending on the architecture.
  
  More info on the confusion https://bugs.freedesktop.org/show_bug.cgi?id=16802
  

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• test/testlock.c

• /*
    Copyright (C) 1997-2014 Sam Lantinga <slouken@libsdl.org>
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely.
  */
  
  /* Test the thread and mutex locking functions
     Also exercises the system's signal/thread interaction
  */
  
  #include <signal.h>
  #include <stdio.h>
  #include <stdlib.h> /* for atexit() */
  
  #include "SDL.h"
  
  static SDL_mutex *mutex = NULL;
  static SDL_threadID mainthread;
  static SDL_Thread *threads[6];
  static volatile int doterminate = 0;
  
  /*
   * SDL_Quit() shouldn't be used with atexit() directly because
   *  calling conventions may differ...
   */
  static void
  SDL_Quit_Wrapper(void)
  {
      SDL_Quit();
  }
  
  void
  printid(void)
  {
      SDL_Log("Process %lu:  exiting\n", SDL_ThreadID());
  }
  
  void
  terminate(int sig)
  {
      signal(SIGINT, terminate);
      doterminate = 1;
  }
  
  void
  closemutex(int sig)
  {
      SDL_threadID id = SDL_ThreadID();
      int i;
      SDL_Log("Process %lu:  Cleaning up...\n", id == mainthread ? 0 : id);
      doterminate = 1;
      for (i = 0; i < 6; ++i)
          SDL_WaitThread(threads[i], NULL);
      SDL_DestroyMutex(mutex);
      exit(sig);
  }
  
  int SDLCALL
  Run(void *data)
  {
      if (SDL_ThreadID() == mainthread)
          signal(SIGTERM, closemutex);
      while (!doterminate) {
          SDL_Log("Process %lu ready to work\n", SDL_ThreadID());
          if (SDL_LockMutex(mutex) < 0) {
              SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't lock mutex: %s", SDL_GetError());
              exit(1);
          }
          SDL_Log("Process %lu, working!\n", SDL_ThreadID());
          SDL_Delay(1 * 1000);
          SDL_Log("Process %lu, done!\n", SDL_ThreadID());
          if (SDL_UnlockMutex(mutex) < 0) {
              SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't unlock mutex: %s", SDL_GetError());
              exit(1);
          }
          /* If this sleep isn't done, then threads may starve */
          SDL_Delay(10);
      }
      if (SDL_ThreadID() == mainthread && doterminate) {
          SDL_Log("Process %lu:  raising SIGTERM\n", SDL_ThreadID());
          raise(SIGTERM);
      }
      return (0);
  }
  
  int
  main(int argc, char *argv[])
  {
      int i;
      int maxproc = 6;
  
  	/* Enable standard application logging */
      SDL_LogSetPriority(SDL_LOG_CATEGORY_APPLICATION, SDL_LOG_PRIORITY_INFO);
  
      /* Load the SDL library */
      if (SDL_Init(0) < 0) {
          SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "%s\n", SDL_GetError());
          exit(1);
      }
      atexit(SDL_Quit_Wrapper);
  
      if ((mutex = SDL_CreateMutex()) == NULL) {
          SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create mutex: %s\n", SDL_GetError());
          exit(1);
      }
  
      mainthread = SDL_ThreadID();
      SDL_Log("Main thread: %lu\n", mainthread);
      atexit(printid);
      for (i = 0; i < maxproc; ++i) {
          char name[64];
          SDL_snprintf(name, sizeof (name), "Worker%d", i);
          if ((threads[i] = SDL_CreateThread(Run, name, NULL)) == NULL)
              SDL_LogError(SDL_LOG_CATEGORY_APPLICATION, "Couldn't create thread!\n");
      }
      signal(SIGINT, terminate);
      Run(NULL);
  
      return (0);                 /* Never reached */
  }
  

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