annotate src/win32/PerfTimer.cpp @ 8:08a8e09ca414
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Robert McIntyre <rlm@mit.edu> |
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Sat, 03 Mar 2012 10:54:39 -0600 |
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f9f4f1b99eed |
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1 // CPerfTimer - a simple Win32 performance counter wrapper
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2 // by Dean Wyant dwyant@mindspring.com
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3
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4 #include "stdafx.h"
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5 #include "PerfTimer.h"
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6
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7 // Declare and initialize static member vars that get set only once and never change
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8 __int64 CPerfTimer::m_Freq = 0;
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9 __int64 CPerfTimer::m_Adjust = 0;
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10
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11 // All functions defined inline for speed. After all, the performance counter is
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12 // supposed to be able to time very short events fairly accurately.
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13
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14
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15
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16 BOOL CPerfTimer::IsSupported()
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17 { // Returns FALSE if performance counter not supported.
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18 // Call after constructing at least one CPerfTimer
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19 return (m_Freq > 1);
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20 }
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21
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22 const double CPerfTimer::Resolution()
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23 { // Returns timer resolution in seconds
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24 return 1.0/(double)m_Freq;
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25 }
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26
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27 const double CPerfTimer::Resolutionms()
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28 { // Returns timer resolution in milliseconds
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29 return 1000.0/(double)m_Freq;
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30 }
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31
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32 const double CPerfTimer::Resolutionus()
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33 { // Returns timer resolution in microseconds
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34 return 1000000.0/(double)m_Freq;
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35 }
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