kc3-lang/SDL/src/timer/SDL_timer_c.h

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• Hash : e663b4eb
  Author :
  Date : 2014-03-01T09:50:52
  

  Fixed bug 2423 - timeBeginPeriod & timeEndPeriod mismatch
  
  Coriiander
  
  In src\timer\windows\SDL_systimer.c there is an error with regards to timeBeginPeriod and timeEndPeriod. These functions typically get called when no high resolution timer is available, and GetTickCount is not used.
  
  According to MSDN (link: http://msdn.microsoft.com/en-us/library/windows/desktop/dd757624(v=vs.85).aspx), for every call to timeBeginPeriod a subsequent call to timeEndPeriod is required. While SDL is currently doing this, it fails to call timeEndPeriod when cleaning up/shutting down SDL. Please note that these functions affect things on a system level. Failing to call timeEndPeriod, disables applications for using WINMM-timers after usage&shutdown of SDL, as effectively they the mechanism is now broken.
  
  Solution:
  Ensure this code gets called when shutting down the timer subsystem:
  
  #ifndef USE_GETTICKCOUNT
  if (!hires_timer_available)
  {
      timeSetPeriod(0);
  }
  #endif
  

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• src/timer/SDL_timer_c.h

• /*
    Simple DirectMedia Layer
    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, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  #include "../SDL_internal.h"
  
  /* Useful functions and variables from SDL_timer.c */
  #include "SDL_timer.h"
  
  #define ROUND_RESOLUTION(X) \
      (((X+TIMER_RESOLUTION-1)/TIMER_RESOLUTION)*TIMER_RESOLUTION)
  
  extern void SDL_TicksInit(void);
  extern void SDL_TicksQuit(void);
  extern int SDL_TimerInit(void);
  extern void SDL_TimerQuit(void);
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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