Mercurial > vba-clojure

     1 // CPerfTimer - a simple Win32 performance counter wrapper

     2 // by Dean Wyant dwyant@mindspring.com

     3 

     4 #include "stdafx.h"

     5 #include "PerfTimer.h"

     6 

     7 // Declare and initialize static member vars that get set only once and never change

     8 __int64 CPerfTimer::m_Freq = 0; 

     9 __int64 CPerfTimer::m_Adjust = 0; 

    10 

    11 // All functions defined inline for speed. After all, the performance counter is 

    12 // supposed to be able to time very short events fairly accurately.

    13 

    14 

    15 

    16 BOOL CPerfTimer::IsSupported()

    17 { // Returns FALSE if performance counter not supported.

    18 	// Call after constructing at least one CPerfTimer

    19 	return (m_Freq > 1);

    20 }

    21 

    22 const double CPerfTimer::Resolution()   

    23 { // Returns timer resolution in seconds

    24 	return 1.0/(double)m_Freq; 

    25 }

    26 

    27 const double CPerfTimer::Resolutionms() 

    28 { // Returns timer resolution in milliseconds

    29 	return 1000.0/(double)m_Freq; 

    30 }

    31 

    32 const double CPerfTimer::Resolutionus() 

    33 { // Returns timer resolution in microseconds

    34 	return 1000000.0/(double)m_Freq; 

    35 }
author	Robert McIntyre <rlm@mit.edu>
date	Sat, 03 Mar 2012 10:31:27 -0600
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