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ef35fa7374
clang-format version 17.0.6 (taskcluster-QueHFUviQeyM8Y7r_d7MQQ) # ignore-this-changeset Differential Revision: https://phabricator.services.mozilla.com/D195397
114 lines
4.0 KiB
C++
114 lines
4.0 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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class TimeStampValueTests;
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class TimeStampTests;
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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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friend class TimeStampValueTests;
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friend class TimeStampTests;
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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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constexpr MFBT_API TimeStampValue(uint64_t aGTC, uint64_t aQPC, bool aHasQPC)
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: mGTC(aGTC),
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mQPC(aQPC),
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mIsNull(aGTC == 0 && aQPC == 0),
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mHasQPC(aHasQPC) {}
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// This constructor should be explicit but it is replacing a constructor that
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// was MOZ_IMPLICIT and there are many locations that are using the automatic
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// conversion.
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constexpr MOZ_IMPLICIT MFBT_API TimeStampValue(uint64_t aGTCAndQPC)
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: TimeStampValue(aGTCAndQPC, aGTCAndQPC, true) {}
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MFBT_API uint64_t CheckQPC(const TimeStampValue& aOther) const;
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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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constexpr bool operator<(const TimeStampValue& aOther) const {
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return mHasQPC && aOther.mHasQPC ? mQPC < aOther.mQPC : mGTC < aOther.mGTC;
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}
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constexpr bool operator>(const TimeStampValue& aOther) const {
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return mHasQPC && aOther.mHasQPC ? mQPC > aOther.mQPC : mGTC > aOther.mGTC;
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}
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constexpr bool operator<=(const TimeStampValue& aOther) const {
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return mHasQPC && aOther.mHasQPC ? mQPC <= aOther.mQPC
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: mGTC <= aOther.mGTC;
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}
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constexpr bool operator>=(const TimeStampValue& aOther) const {
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return mHasQPC && aOther.mHasQPC ? mQPC >= aOther.mQPC
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: mGTC >= aOther.mGTC;
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}
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constexpr bool operator==(const TimeStampValue& aOther) const {
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return mHasQPC && aOther.mHasQPC ? mQPC == aOther.mQPC
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: mGTC == aOther.mGTC;
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}
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constexpr bool operator!=(const TimeStampValue& aOther) const {
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return mHasQPC && aOther.mHasQPC ? mQPC != aOther.mQPC
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: mGTC != aOther.mGTC;
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}
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constexpr bool IsNull() const { return mIsNull; }
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#if defined(DEBUG)
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uint64_t GTC() const { return mGTC; }
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uint64_t QPC() const { return mQPC; }
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bool HasQPC() const { return mHasQPC; }
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#endif
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};
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} // namespace mozilla
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#endif /* mozilla_TimeStamp_h */
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