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/*
* $Id: pa_win_util.c,v 1.1.2.7 2003/09/15 18:30:26 rossbencina Exp $
* Portable Audio I/O Library
* Win32 platform-specific support functions
*
* Based on the Open Source API proposed by Ross Bencina
* Copyright (c) 1999-2000 Ross Bencina
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files
* (the "Software"), to deal in the Software without restriction,
* including without limitation the rights to use, copy, modify, merge,
* publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* Any person wishing to distribute modifications to the Software is
* requested to send the modifications to the original developer so that
* they can be incorporated into the canonical version.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/** @file
Win32 platform-specific support functions.
@todo Implement workaround for QueryPerformanceCounter() skipping forward
bug. (see msdn kb Q274323).
*/
#include <windows.h>
#include <mmsystem.h> /* for timeGetTime() */
#include "pa_util.h"
/*
Track memory allocations to avoid leaks.
*/
#if PA_TRACK_MEMORY
static int numAllocations_ = 0;
#endif
void *PaUtil_AllocateMemory( long size )
{
void *result = GlobalAlloc( GPTR, size );
#if PA_TRACK_MEMORY
if( result != NULL ) numAllocations_ += 1;
#endif
return result;
}
void PaUtil_FreeMemory( void *block )
{
if( block != NULL )
{
GlobalFree( block );
#if PA_TRACK_MEMORY
numAllocations_ -= 1;
#endif
}
}
int PaUtil_CountCurrentlyAllocatedBlocks( void )
{
#if PA_TRACK_MEMORY
return numAllocations_;
#else
return 0;
#endif
}
void Pa_Sleep( long msec )
{
Sleep( msec );
}
static int usePerformanceCounter_;
static double secondsPerTick_;
void PaUtil_InitializeClock( void )
{
LARGE_INTEGER ticksPerSecond;
if( QueryPerformanceFrequency( &ticksPerSecond ) != 0 )
{
usePerformanceCounter_ = 1;
secondsPerTick_ = 1.0 / (double)ticksPerSecond.QuadPart;
}
else
{
usePerformanceCounter_ = 0;
}
}
double PaUtil_GetTime( void )
{
LARGE_INTEGER time;
if( usePerformanceCounter_ )
{
/* FIXME:
according to this knowledge-base article, QueryPerformanceCounter
can skip forward by seconds!
http://support.microsoft.com/default.aspx?scid=KB;EN-US;Q274323&
it may be better to use the rtdsc instruction using inline asm,
however then a method is needed to calculate a ticks/seconds ratio.
*/
QueryPerformanceCounter( &time );
return time.QuadPart * secondsPerTick_;
}
else
{
return timeGetTime() * .001;
}
}
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