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https://github.com/yuzu-emu/FasTC.git
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107 lines
3.5 KiB
C++
Executable File
107 lines
3.5 KiB
C++
Executable File
//--------------------------------------------------------------------------------------
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// Copyright 2011 Intel Corporation
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// All Rights Reserved
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//
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// Permission is granted to use, copy, distribute and prepare derivative works of this
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// software for any purpose and without fee, provided, that the above copyright notice
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// and this statement appear in all copies. Intel makes no representations about the
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// suitability of this software for any purpose. THIS SOFTWARE IS PROVIDED "AS IS."
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// INTEL SPECIFICALLY DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, AND ALL LIABILITY,
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// INCLUDING CONSEQUENTIAL AND OTHER INDIRECT DAMAGES, FOR THE USE OF THIS SOFTWARE,
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// INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PROPRIETARY RIGHTS, AND INCLUDING THE
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. Intel does not
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// assume any responsibility for any errors which may appear in this software nor any
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// responsibility to update it.
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//
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//--------------------------------------------------------------------------------------
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#include "StopWatch.h"
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#include <cassert>
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// Initialize member variables.
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StopWatch::StopWatch() :
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frequency(0),
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start(0),
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stop(0),
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affinityMask(0)
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{
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// Initialize the performance counter frequency.
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LARGE_INTEGER perfQuery;
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BOOL supported = QueryPerformanceFrequency(&perfQuery);
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assert(supported == TRUE);
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this->frequency = perfQuery.QuadPart;
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}
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// Start the stopwatch.
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void StopWatch::Start()
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{
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// MSDN recommends setting the thread affinity to avoid bugs in the BIOS and HAL.
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// Create an affinity mask for the current processor.
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affinityMask = (DWORD_PTR)1 << GetCurrentProcessorNumber();
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HANDLE currThread = GetCurrentThread();
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DWORD_PTR prevAffinityMask = SetThreadAffinityMask(currThread, affinityMask);
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assert(prevAffinityMask != 0);
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// Query the performance counter.
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LARGE_INTEGER perfQuery;
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BOOL result = QueryPerformanceCounter(&perfQuery);
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assert(result);
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start = perfQuery.QuadPart;
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// Restore the thread's affinity mask.
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prevAffinityMask = SetThreadAffinityMask(currThread, prevAffinityMask);
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assert(prevAffinityMask != 0);
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}
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// Stop the stopwatch.
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void StopWatch::Stop()
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{
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// MSDN recommends setting the thread affinity to avoid bugs in the BIOS and HAL.
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// Use the affinity mask that was created in the Start function.
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HANDLE currThread = GetCurrentThread();
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DWORD_PTR prevAffinityMask = SetThreadAffinityMask(currThread, affinityMask);
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assert(prevAffinityMask != 0);
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// Query the performance counter.
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LARGE_INTEGER perfQuery;
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BOOL result = QueryPerformanceCounter(&perfQuery);
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assert(result);
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stop = perfQuery.QuadPart;
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// Restore the thread's affinity mask.
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prevAffinityMask = SetThreadAffinityMask(currThread, prevAffinityMask);
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assert(prevAffinityMask != 0);
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}
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// Reset the stopwatch.
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void StopWatch::Reset()
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{
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start = 0;
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stop = 0;
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affinityMask = 0;
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}
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// Get the elapsed time in seconds.
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double StopWatch::TimeInSeconds() const
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{
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// Return the elapsed time in seconds.
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assert((stop - start) > 0);
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return double(stop - start) / double(frequency);
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}
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// Get the elapsed time in milliseconds.
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double StopWatch::TimeInMilliseconds() const
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{
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// Return the elapsed time in milliseconds.
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assert((stop - start) > 0);
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return double(stop - start) / double(frequency) * 1000.0;
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}
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// Get the elapsed time in microseconds.
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double StopWatch::TimeInMicroseconds() const
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{
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// Return the elapsed time in microseconds.
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assert((stop - start) > 0);
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return double(stop - start) / double(frequency) * 1000000.0;
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}
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