ClearScript/ClearScriptV8/HighResolutionClock.Windows.cpp at master · PascalMing/ClearScript · GitHub

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// Licensed under the MIT license.

#include "ClearScriptV8Native.h"

#include <windows.h>

//-----------------------------------------------------------------------------

// HighResolutionClock implementation

//-----------------------------------------------------------------------------

static OnceFlag s_InitializationFlag;

static LARGE_INTEGER s_TicksPerSecond;

//-----------------------------------------------------------------------------

double HighResolutionClock::GetRelativeSeconds()

{

s_InitializationFlag.CallOnce([]

{

ASSERT_EVAL(::QueryPerformanceFrequency(&s_TicksPerSecond));

});

LARGE_INTEGER tickCount;

ASSERT_EVAL(::QueryPerformanceCounter(&tickCount));

auto wholeSeconds = tickCount.QuadPart / s_TicksPerSecond.QuadPart;

auto remainingTicks = tickCount.QuadPart % s_TicksPerSecond.QuadPart;

return wholeSeconds + (static_cast<double>(remainingTicks) / s_TicksPerSecond.QuadPart);

}

//-----------------------------------------------------------------------------

size_t HighResolutionClock::GetHardwareConcurrency()

{

SYSTEM_INFO info;

::GetNativeSystemInfo(&info);

return info.dwNumberOfProcessors;

}

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