39 lines
1021 B
C++
39 lines
1021 B
C++
// CPerfTimer - a simple Win32 performance counter wrapper
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// by Dean Wyant dwyant@mindspring.com
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#include "stdafx.h"
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#include "PerfTimer.h"
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// Declare and initialize static member vars that get set only once and never change
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__int64 CPerfTimer::m_Freq = 0;
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__int64 CPerfTimer::m_Adjust = 0;
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// All functions defined inline for speed. After all, the performance counter is
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// supposed to be able to time very short events fairly accurately.
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BOOL CPerfTimer::IsSupported()
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{ // Returns FALSE if performance counter not supported.
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// Call after constructing at least one CPerfTimer
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return (m_Freq > 1);
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}
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const double CPerfTimer::Resolution()
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{ // Returns timer resolution in seconds
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return 1.0/(double)m_Freq;
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}
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const double CPerfTimer::Resolutionms()
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{ // Returns timer resolution in milliseconds
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return 1000.0/(double)m_Freq;
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}
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const double CPerfTimer::Resolutionus()
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{ // Returns timer resolution in microseconds
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return 1000000.0/(double)m_Freq;
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}
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