112 lines
2.5 KiB
C++
112 lines
2.5 KiB
C++
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//+--------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1996.
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//
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// File: B E N C H M R K . C P P
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//
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// Contents: Benchmarking class
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//
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// Notes:
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//
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// Author: billbe 13 Oct 1997
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//
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//---------------------------------------------------------------------------
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#include <pch.h>
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#pragma hdrstop
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#include "benchmrk.h"
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CBenchmark::CBenchmark()
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: m_i64Frequency(1000),
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m_sznDescription(NULL),
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m_i64TotalTime(0),
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m_fStarted(FALSE)
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{
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LARGE_INTEGER li1;
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// Check if QueryPerformanceCounter is supported
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if (QueryPerformanceCounter(&li1))
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{
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// Now get # of ticks per second
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QueryPerformanceFrequency(reinterpret_cast<LARGE_INTEGER*>
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(&m_i64Frequency));
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m_fSupported = TRUE;
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}
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else
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{
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TraceTag(ttidBenchmark, "High performance counter is not supported.");
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m_fSupported = FALSE;
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}
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}
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CBenchmark::~CBenchmark()
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{
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delete [] m_sznDescription;
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}
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void
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CBenchmark::Start(PCSTR sznDescription)
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{
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// If QueryPerformanceCounter is supported
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if (m_fSupported)
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{
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// delete the old description
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delete [] m_sznDescription;
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// replace with new one if specified
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if (sznDescription)
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{
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m_sznDescription = new CHAR[strlen(sznDescription) + 1];
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if (m_sznDescription)
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{
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strcpy(m_sznDescription, sznDescription);
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}
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}
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else
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{
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// no description specified clear the member variable
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m_sznDescription = NULL;
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}
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m_fStarted = TRUE;
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m_i64TotalTime = 0;
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// Record our start time
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QueryPerformanceCounter(reinterpret_cast<LARGE_INTEGER*>
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(&m_i64StartTime));
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}
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}
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void
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CBenchmark::Stop()
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{
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__int64 i64Stop;
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// Record our stop time
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QueryPerformanceCounter(reinterpret_cast<LARGE_INTEGER*>(&i64Stop));
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// If start was called prior to stop, then record the total time and
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// reset our m_fStarted flag
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//
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if (m_fStarted)
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{
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m_fStarted = FALSE;
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m_i64TotalTime = i64Stop - m_i64StartTime;
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}
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else
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{
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// invalidate previous benchmark since stop was called before start
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m_i64TotalTime = 0;
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}
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}
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PCSTR
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CBenchmark::SznBenchmarkSeconds(unsigned short usPrecision)
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{
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CHAR sznFmt[10];
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sprintf(sznFmt, "%%.%df", usPrecision);
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sprintf(m_sznSeconds, sznFmt, DblBenchmarkSeconds());
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return m_sznSeconds;
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}
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