зеркало из https://github.com/mozilla/gecko-dev.git
94 строки
3.1 KiB
C++
94 строки
3.1 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_TimeStamp_windows_h
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#define mozilla_TimeStamp_windows_h
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#include "mozilla/Types.h"
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namespace mozilla {
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/**
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* The [mt] unit:
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*
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* Many values are kept in ticks of the Performance Counter x 1000,
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* further just referred as [mt], meaning milli-ticks.
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*
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* This is needed to preserve maximum precision of the performance frequency
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* representation. GetTickCount64 values in milliseconds are multiplied with
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* frequency per second. Therefore we need to multiply QPC value by 1000 to
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* have the same units to allow simple arithmentic with both QPC and GTC.
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*/
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#define ms2mt(x) ((x)*mozilla::GetQueryPerformanceFrequencyPerSec())
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#define mt2ms(x) ((x) / mozilla::GetQueryPerformanceFrequencyPerSec())
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#define mt2ms_f(x) (double(x) / mozilla::GetQueryPerformanceFrequencyPerSec())
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MFBT_API uint64_t GetQueryPerformanceFrequencyPerSec();
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class TimeStamp;
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class TimeStampValue;
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TimeStampValue NowInternal(bool aHighResolution);
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class TimeStampValue {
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friend TimeStampValue NowInternal(bool);
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friend bool IsCanonicalTimeStamp(TimeStampValue);
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friend struct IPC::ParamTraits<mozilla::TimeStampValue>;
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friend class TimeStamp;
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// Both QPC and GTC are kept in [mt] units.
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uint64_t mGTC;
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uint64_t mQPC;
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bool mIsNull;
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bool mHasQPC;
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MFBT_API TimeStampValue(uint64_t aGTC, uint64_t aQPC, bool aHasQPC);
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MFBT_API uint64_t CheckQPC(const TimeStampValue& aOther) const;
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// This struct is used to allow doing TimeStampValue a = 0 and similar
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struct _SomethingVeryRandomHere;
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constexpr MOZ_IMPLICIT TimeStampValue(_SomethingVeryRandomHere* aNullValue)
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: mGTC(0), mQPC(0), mIsNull(true), mHasQPC(false) {}
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public:
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MFBT_API uint64_t operator-(const TimeStampValue& aOther) const;
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TimeStampValue operator+(const int64_t aOther) const {
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return TimeStampValue(mGTC + aOther, mQPC + aOther, mHasQPC);
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}
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TimeStampValue operator-(const int64_t aOther) const {
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return TimeStampValue(mGTC - aOther, mQPC - aOther, mHasQPC);
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}
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MFBT_API TimeStampValue& operator+=(const int64_t aOther);
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MFBT_API TimeStampValue& operator-=(const int64_t aOther);
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bool operator<(const TimeStampValue& aOther) const {
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return int64_t(*this - aOther) < 0;
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}
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bool operator>(const TimeStampValue& aOther) const {
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return int64_t(*this - aOther) > 0;
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}
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bool operator<=(const TimeStampValue& aOther) const {
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return int64_t(*this - aOther) <= 0;
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}
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bool operator>=(const TimeStampValue& aOther) const {
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return int64_t(*this - aOther) >= 0;
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}
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bool operator==(const TimeStampValue& aOther) const {
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return int64_t(*this - aOther) == 0;
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}
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bool operator!=(const TimeStampValue& aOther) const {
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return int64_t(*this - aOther) != 0;
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}
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bool IsNull() const { return mIsNull; }
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};
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} // namespace mozilla
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#endif /* mozilla_TimeStamp_h */
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