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app/PublicUtility/CAHostTimeBase.cpp Normal file
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/*
File: CAHostTimeBase.cpp
Abstract: CAHostTimeBase.h
Version: 1.1
Disclaimer: IMPORTANT: This Apple software is supplied to you by Apple
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terms, and your use, installation, modification or redistribution of
this Apple software constitutes acceptance of these terms. If you do
not agree with these terms, please do not use, install, modify or
redistribute this Apple software.
In consideration of your agreement to abide by the following terms, and
subject to these terms, Apple grants you a personal, non-exclusive
license, under Apple's copyrights in this original Apple software (the
"Apple Software"), to use, reproduce, modify and redistribute the Apple
Software, with or without modifications, in source and/or binary forms;
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text and disclaimers in all such redistributions of the Apple Software.
Neither the name, trademarks, service marks or logos of Apple Inc. may
be used to endorse or promote products derived from the Apple Software
without specific prior written permission from Apple. Except as
expressly stated in this notice, no other rights or licenses, express or
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MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS
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OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.
IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL
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AND WHETHER UNDER THEORY OF CONTRACT, TORT (INCLUDING NEGLIGENCE),
STRICT LIABILITY OR OTHERWISE, EVEN IF APPLE HAS BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
Copyright (C) 2014 Apple Inc. All Rights Reserved.
*/
//=============================================================================
// Includes
//=============================================================================
#include "CAHostTimeBase.h"
Float64 CAHostTimeBase::sFrequency = 0;
Float64 CAHostTimeBase::sInverseFrequency = 0;
UInt32 CAHostTimeBase::sMinDelta = 0;
UInt32 CAHostTimeBase::sToNanosNumerator = 0;
UInt32 CAHostTimeBase::sToNanosDenominator = 0;
pthread_once_t CAHostTimeBase::sIsInited = PTHREAD_ONCE_INIT;
#if Track_Host_TimeBase
UInt64 CAHostTimeBase::sLastTime = 0;
#endif
//=============================================================================
// CAHostTimeBase
//
// This class provides platform independent access to the host's time base.
//=============================================================================
void CAHostTimeBase::Initialize()
{
// get the info about Absolute time
#if TARGET_OS_MAC
struct mach_timebase_info theTimeBaseInfo;
mach_timebase_info(&theTimeBaseInfo);
sMinDelta = 1;
sToNanosNumerator = theTimeBaseInfo.numer;
sToNanosDenominator = theTimeBaseInfo.denom;
// the frequency of that clock is: (sToNanosDenominator / sToNanosNumerator) * 10^9
sFrequency = static_cast<Float64>(sToNanosDenominator) / static_cast<Float64>(sToNanosNumerator);
sFrequency *= 1000000000.0;
#elif TARGET_OS_WIN32
LARGE_INTEGER theFrequency;
QueryPerformanceFrequency(&theFrequency);
sMinDelta = 1;
sToNanosNumerator = 1000000000ULL;
sToNanosDenominator = *((UInt64*)&theFrequency);
sFrequency = static_cast<Float64>(*((UInt64*)&theFrequency));
#endif
sInverseFrequency = 1.0 / sFrequency;
#if Log_Host_Time_Base_Parameters
DebugPrintf("Host Time Base Parameters");
DebugPrintf(" Minimum Delta: %lu", (unsigned long)sMinDelta);
DebugPrintf(" Frequency: %f", sFrequency);
DebugPrintf(" To Nanos Numerator: %lu", (unsigned long)sToNanosNumerator);
DebugPrintf(" To Nanos Denominator: %lu", (unsigned long)sToNanosDenominator);
#endif
}