Source code
Revision control
Copy as Markdown
Other Tools
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
#ifndef mozilla_TimeStamp_windows_h
#define mozilla_TimeStamp_windows_h
#include "mozilla/Types.h"
namespace mozilla {
/**
* The [mt] unit:
*
* Many values are kept in ticks of the Performance Counter x 1000,
* further just referred as [mt], meaning milli-ticks.
*
* This is needed to preserve maximum precision of the performance frequency
* representation. GetTickCount64 values in milliseconds are multiplied with
* frequency per second. Therefore we need to multiply QPC value by 1000 to
* have the same units to allow simple arithmentic with both QPC and GTC.
*/
#define ms2mt(x) ((x) * mozilla::GetQueryPerformanceFrequencyPerSec())
#define mt2ms(x) ((x) / mozilla::GetQueryPerformanceFrequencyPerSec())
#define mt2ms_f(x) (double(x) / mozilla::GetQueryPerformanceFrequencyPerSec())
MFBT_API uint64_t GetQueryPerformanceFrequencyPerSec();
class TimeStamp;
class TimeStampValue;
class TimeStampValueTests;
class TimeStampTests;
TimeStampValue NowInternal(bool aHighResolution);
class TimeStampValue {
friend TimeStampValue NowInternal(bool);
friend bool IsCanonicalTimeStamp(TimeStampValue);
friend struct IPC::ParamTraits<mozilla::TimeStampValue>;
friend class TimeStamp;
friend class TimeStampValueTests;
friend class TimeStampTests;
// Both QPC and GTC are kept in [mt] units.
uint64_t mGTC;
uint64_t mQPC;
bool mIsNull;
bool mHasQPC;
constexpr MFBT_API TimeStampValue(uint64_t aGTC, uint64_t aQPC, bool aHasQPC)
: mGTC(aGTC),
mQPC(aQPC),
mIsNull(aGTC == 0 && aQPC == 0),
mHasQPC(aHasQPC) {}
// This constructor should be explicit but it is replacing a constructor that
// was MOZ_IMPLICIT and there are many locations that are using the automatic
// conversion.
constexpr MOZ_IMPLICIT MFBT_API TimeStampValue(uint64_t aGTCAndQPC)
: TimeStampValue(aGTCAndQPC, aGTCAndQPC, true) {}
MFBT_API uint64_t CheckQPC(const TimeStampValue& aOther) const;
public:
MFBT_API uint64_t operator-(const TimeStampValue& aOther) const;
TimeStampValue operator+(const int64_t aOther) const {
return TimeStampValue(mGTC + aOther, mQPC + aOther, mHasQPC);
}
TimeStampValue operator-(const int64_t aOther) const {
return TimeStampValue(mGTC - aOther, mQPC - aOther, mHasQPC);
}
MFBT_API TimeStampValue& operator+=(const int64_t aOther);
MFBT_API TimeStampValue& operator-=(const int64_t aOther);
constexpr bool operator<(const TimeStampValue& aOther) const {
return mHasQPC && aOther.mHasQPC ? mQPC < aOther.mQPC : mGTC < aOther.mGTC;
}
constexpr bool operator>(const TimeStampValue& aOther) const {
return mHasQPC && aOther.mHasQPC ? mQPC > aOther.mQPC : mGTC > aOther.mGTC;
}
constexpr bool operator<=(const TimeStampValue& aOther) const {
return mHasQPC && aOther.mHasQPC ? mQPC <= aOther.mQPC
: mGTC <= aOther.mGTC;
}
constexpr bool operator>=(const TimeStampValue& aOther) const {
return mHasQPC && aOther.mHasQPC ? mQPC >= aOther.mQPC
: mGTC >= aOther.mGTC;
}
constexpr bool operator==(const TimeStampValue& aOther) const {
return mHasQPC && aOther.mHasQPC ? mQPC == aOther.mQPC
: mGTC == aOther.mGTC;
}
constexpr bool operator!=(const TimeStampValue& aOther) const {
return mHasQPC && aOther.mHasQPC ? mQPC != aOther.mQPC
: mGTC != aOther.mGTC;
}
constexpr bool IsNull() const { return mIsNull; }
#if defined(DEBUG)
uint64_t GTC() const { return mGTC; }
uint64_t QPC() const { return mQPC; }
bool HasQPC() const { return mHasQPC; }
#endif
};
} // namespace mozilla
#endif /* mozilla_TimeStamp_h */