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

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// Licensed under the MIT license.

#include "ClearScriptV8Native.h"

#include <windows.h>

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

// HighResolutionClock implementation

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

static TIMECAPS s_TimeCaps {};

static auto s_GotTimeCaps = false;

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

bool HighResolutionClock::SetTimerResolution()

{

static OnceFlag s_InitializationFlag;

s_InitializationFlag.CallOnce([]()

{

s_GotTimeCaps = ::timeGetDevCaps(&s_TimeCaps, sizeof s_TimeCaps) == MMSYSERR_NOERROR;

});

return s_GotTimeCaps && (::timeBeginPeriod(s_TimeCaps.wPeriodMin) == TIMERR_NOERROR);

}

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

void HighResolutionClock::RestoreTimerResolution()

{

if (s_GotTimeCaps)

{

ASSERT_EVAL(::timeEndPeriod(s_TimeCaps.wPeriodMin) == TIMERR_NOERROR);

}

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

size_t HighResolutionClock::GetHardwareConcurrency()

{

SYSTEM_INFO info;

::GetNativeSystemInfo(&info);

return info.dwNumberOfProcessors;

}

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