vmhighperfcounter.cpp

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}
/* End of function "VMGetHighPerfCounterTickCount"
/*****************************************************************************/

/*****************************************************************************/
/*

     FUNCTION NAME:  VMGetHighPerfCounterTicksPerSecond

       DESCRIPTION:  Get the number of processor ticks per second. 
                     Note: On the first call, this function can execute for up
                           to 100 milliseconds

             INPUT:  void
            OUTPUT:  none

           RETURNS:  LARGE_INTEGER for the number of ticks per second 
*/
LARGE_INTEGER VMGetHighPerfCounterTicksPerSecond( void )
{
  LARGE_INTEGER xQuotientOne;
  LARGE_INTEGER xQuotientTwo;
  LARGE_INTEGER xRemainderOne;
  LARGE_INTEGER xRemainderTwo;
  LARGE_INTEGER xFrequency;
  LARGE_INTEGER xQuotientTotal;
  LARGE_INTEGER xQuotientDifference;
  LARGE_INTEGER xRemainderTotal;
  LARGE_INTEGER xRemainderDifference;
  LARGE_INTEGER xValue;

  if ( m_VMHPCTicksPerSecond.LowPart != 0 || m_VMHPCTicksPerSecond.HighPart != 0 )
  {
    return( m_VMHPCTicksPerSecond );
  }

  HANDLE hThreadID  = GetCurrentThread();
  int    iPriority  = GetThreadPriority( hThreadID );
  SetThreadPriority( hThreadID, THREAD_PRIORITY_TIME_CRITICAL );

  QueryPerformanceCounter( &xQuotientOne );
  xRemainderOne = VMGetHighPerfCounterTickCount();
  Sleep( 100 );
  xRemainderTwo = VMGetHighPerfCounterTickCount();
  QueryPerformanceCounter( &xQuotientTwo );

  SetThreadPriority( hThreadID, iPriority );

  xQuotientTotal  = VMLargeIntSubtract( xQuotientTwo, xQuotientOne );
  xRemainderTotal = VMLargeIntSubtract( xRemainderTwo, xRemainderOne );

  QueryPerformanceCounter( &xQuotientOne );
  xRemainderOne = VMGetHighPerfCounterTickCount();
  xRemainderTwo = VMGetHighPerfCounterTickCount();
  QueryPerformanceCounter( &xQuotientTwo );

  xQuotientDifference  = VMLargeIntSubtract( xQuotientTwo, xQuotientOne );
  xRemainderDifference = VMLargeIntSubtract( xRemainderTwo, xRemainderOne );

  xQuotientTotal  = VMLargeIntSubtract( xQuotientTotal, xQuotientDifference );
  xRemainderTotal = VMLargeIntSubtract( xRemainderTotal, xRemainderDifference );

  QueryPerformanceFrequency( &xFrequency );

  xValue = VMLargeIntMultiply( xRemainderTotal.LowPart, xFrequency.LowPart );

  m_VMHPCTicksPerSecond = VMLargeIntDivide( xValue, xQuotientTotal );

  return( m_VMHPCTicksPerSecond );
}
/* End of function "VMGetHighPerfCounterTicksPerSecond"
/*****************************************************************************/


/*****************************************************************************/
/*

     FUNCTION NAME:  VMGetHighPerfCounterTimer

       DESCRIPTION:  Get a processor timeup timer for the given time 
                     (HPC time constant).

             INPUT:  eHPCTime - the time constant to add to now
            OUTPUT:  none

           RETURNS:  LARGE_INTEGER - a value that represents an offset from now
                     for the given constant time 
*/
LARGE_INTEGER VMGetHighPerfCounterTimer( VMHPCTIME eHPCTime )
{
  if ( !m_VMHPCInited )
  {
    VMHighPerfCounterInit();
  }
  return( VMLargeIntAdd( VMGetHighPerfCounterTickCount(), m_VMHPCTime[ eHPCTime ] ) );
}
/* End of function "GetHighPerfCounterTimer"
/*****************************************************************************/


/*****************************************************************************/
/*

     FUNCTION NAME:  VMGetTickCountByOffset

       DESCRIPTION:  gets the tick count associated with the given offset

             INPUT:  eHPCTime - the index to use to look up in the ticks table
            OUTPUT:  none

           RETURNS:  LARGE_INTEGER  - tick count for the given index
*/
LARGE_INTEGER VMGetTickCountByOffset( VMHPCTIME eHPCTime )
{
  return( m_VMHPCTime[ eHPCTime ] );
}
/* End of function "VMGetTickCountByOffset"
/*****************************************************************************/


/*****************************************************************************/
/*

     FUNCTION NAME:  VMIsHighPerfCounterTimerUp

       DESCRIPTION:  

             INPUT:  xTimer - the timer to evaluate
            OUTPUT:  none

           RETURNS:  true if the timer is expired
*/
BOOL VMIsHighPerfCounterTimerUp( LARGE_INTEGER xTimer )
{
  return( VMLargeIntGreaterThanOrEqualTo( VMGetHighPerfCounterTickCount(), xTimer ) );
}
/* End of function "VMIsHighPerfCounterTimerUp"
/*****************************************************************************/


/*****************************************************************************/
/*

     FUNCTION NAME:  VMGetHighPerfCounterMillis

       DESCRIPTION:  convert a processor tick count to milliseconds

             INPUT:  xTicks - the tick count to convert
            OUTPUT:  none

           RETURNS:  ULONG for milliseconds in the tick count
*/
ULONG VMGetHighPerfCounterMillis( LARGE_INTEGER xTicks )
{
  if ( !m_VMHPCInited )
  {
    VMHighPerfCounterInit();
  }
  return( VMLargeIntDivide( xTicks, m_VMHPCTime[ VMHPC1MSEC ] ).LowPart );
}
/* End of function "VMGetHighPerfCounterMillis"
/*****************************************************************************/


/*****************************************************************************/
/*

     FUNCTION NAME:  VMGetHighPerfCounterMicros

       DESCRIPTION:  convert a processor tick count to microseconds

             INPUT:  xTicks - the tick count to convert
            OUTPUT:  none

           RETURNS:  ULONG for microseconds in the tick count
*/
ULONG VMGetHighPerfCounterMicros( LARGE_INTEGER xTicks )
{
  if ( !m_VMHPCInited )
  {
    VMHighPerfCounterInit();
  }
  return( VMLargeIntDivide( xTicks, m_VMHPCTime[ VMHPC1USEC ] ).LowPart );
}
/* End of function "VMGetHighPerfCounterMicros"
/*****************************************************************************/


/*****************************************************************************/
/*

     FUNCTION NAME:  VMGetHighPerfCounterElapsedMillis

       DESCRIPTION:  Get the number of milliseconds that have elapsed since
                     the given processor tick.

             INPUT:  xTicks - the tick to compare from
            OUTPUT:  none

           RETURNS:  ULONG for the total number of millies elapsed
*/
ULONG VMGetHighPerfCounterElapsedMillis( LARGE_INTEGER xTicks )
{
  if ( !m_VMHPCInited )
  {
    VMHighPerfCounterInit();
  }

  LARGE_INTEGER xNowTicks = VMGetHighPerfCounterTickCount();

  return( VMLargeIntGreaterThan( xNowTicks, xTicks ) 
          ? VMLargeIntDivide( VMLargeIntSubtract( xNowTicks, xTicks ), 
                              m_VMHPCTime[ VMHPC1MSEC ] ).LowPart 
          : 0 );
}
/* End of function "VMGetHighPerfCounterElapsedMillis"
/*****************************************************************************/



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/* Check-in history */
/*
 *$Log:  $
*/
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