102 lines
2.3 KiB
C++
102 lines
2.3 KiB
C++
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//+------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1993.
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//
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// File: stopwtch.cxx
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//
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// Contents: StopWatch timer
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//
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// Classes: CStopWatch
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//
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// Functions:
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//
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// History: 30-June-93 t-martig Created
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//
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//--------------------------------------------------------------------------
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extern "C"
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{
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#include <nt.h>
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#include <ntrtl.h>
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#include <nturtl.h>
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};
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#include <windows.h>
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#include <stopwtch.hxx>
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//+-------------------------------------------------------------------
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//
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// Member: CStopWatch::Resolution, public
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//
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// Synopsis: Inquires performance timer resolution
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//
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// Returns: Performance counter ticks / second
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//
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// History: 30-June-93 t-martig Created
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//
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//--------------------------------------------------------------------
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CStopWatch::CStopWatch ()
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{
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QueryPerformanceFrequency (&liFreq);
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}
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//+-------------------------------------------------------------------
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//
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// Member: CStopWatch::Reset, public
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//
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// Synopsis: Starts measurement cycle
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//
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// History: 30-June-93 t-martig Created
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//
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//--------------------------------------------------------------------
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void CStopWatch::Reset ()
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{
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QueryPerformanceCounter (&liStart); // BUGBUG - test for error !
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}
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//+-------------------------------------------------------------------
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//
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// Member: CStopWatch::Read, public
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//
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// Synopsis: Reads stop watch timer
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//
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// Returns: Time since call of CStopWatch::Reset (in microseconds)
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//
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// History: 30-June-93 t-martig Created
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//
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//--------------------------------------------------------------------
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ULONG CStopWatch::Read ()
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{
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LARGE_INTEGER liNow, liDelta, liRemainder;
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QueryPerformanceCounter (&liNow); // BUGBUG - test for error
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liDelta = RtlLargeIntegerSubtract (liNow, liStart);
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liDelta = RtlExtendedIntegerMultiply (liDelta, 1000000);
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liDelta = RtlLargeIntegerDivide (liDelta, liFreq, &liRemainder);
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return liDelta.LowPart;
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}
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//+-------------------------------------------------------------------
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//
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// Member: CStopWatch::Resolution, public
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//
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// Synopsis: Inquires performance timer resolution
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//
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// Returns: Performance counter ticks / second
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//
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// History: 30-June-93 t-martig Created
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//
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//--------------------------------------------------------------------
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ULONG CStopWatch::Resolution ()
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{
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return liFreq.LowPart;
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}
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