зеркало из https://github.com/mozilla/gecko-dev.git
119 строки
4.0 KiB
C++
119 строки
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_AwakeTimeStamp_h
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#define mozilla_AwakeTimeStamp_h
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#include <stdint.h>
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#include <mozilla/Types.h>
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#include "mozilla/Assertions.h"
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namespace mozilla {
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class AwakeTimeDuration;
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// Conceptually like mozilla::TimeStamp, but only increments when the device is
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// awake, on all platforms, and with a restricted API.
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//
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// It is always valid, there is no way to acquire an AwakeTimeStamp that is not
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// valid, unlike TimeStamp that can be null.
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//
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// Some arithmetic and ordering operations are supported, when they make sense.
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//
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// This timestamp shouldn't be considered to be high-resolution, and is suitable
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// to measure time from a hundred of milliseconds (because of Windows
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// limitations).
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class AwakeTimeStamp {
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public:
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MFBT_API static AwakeTimeStamp NowLoRes();
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MFBT_API void operator+=(const AwakeTimeDuration& aOther);
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MFBT_API void operator-=(const AwakeTimeDuration& aOther);
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MFBT_API bool operator<(const AwakeTimeStamp& aOther) const {
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return mValueUs < aOther.mValueUs;
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}
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MFBT_API bool operator<=(const AwakeTimeStamp& aOther) const {
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return mValueUs <= aOther.mValueUs;
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}
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MFBT_API bool operator>=(const AwakeTimeStamp& aOther) const {
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return mValueUs >= aOther.mValueUs;
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}
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MFBT_API bool operator>(const AwakeTimeStamp& aOther) const {
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return mValueUs > aOther.mValueUs;
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}
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MFBT_API bool operator==(const AwakeTimeStamp& aOther) const {
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return mValueUs == aOther.mValueUs;
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}
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MFBT_API bool operator!=(const AwakeTimeStamp& aOther) const {
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return !(*this == aOther);
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}
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MFBT_API AwakeTimeDuration operator-(AwakeTimeStamp const& aOther) const;
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MFBT_API AwakeTimeStamp operator+(const AwakeTimeDuration& aDuration) const;
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private:
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explicit AwakeTimeStamp(uint64_t aValueUs) : mValueUs(aValueUs) {}
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uint64_t mValueUs;
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};
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// A duration, only counting the time the computer was awake.
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//
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// Can be obtained via subtracting two AwakeTimeStamp, or default-contructed to
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// mean a empty duration.
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//
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// Arithmetic and ordering operations are defined when they make sense.
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class AwakeTimeDuration {
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public:
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MFBT_API AwakeTimeDuration() : mValueUs(0) {}
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MFBT_API double ToSeconds() const;
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MFBT_API double ToMilliseconds() const;
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MFBT_API double ToMicroseconds() const;
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MFBT_API void operator+=(const AwakeTimeDuration& aDuration) {
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mValueUs += aDuration.mValueUs;
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}
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MFBT_API AwakeTimeDuration operator+(const AwakeTimeDuration& aOther) const {
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return AwakeTimeDuration(mValueUs + aOther.mValueUs);
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}
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MFBT_API AwakeTimeDuration operator-(const AwakeTimeDuration& aOther) const {
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MOZ_ASSERT(mValueUs >= aOther.mValueUs);
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return AwakeTimeDuration(mValueUs - aOther.mValueUs);
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}
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MFBT_API void operator-=(const AwakeTimeDuration& aOther) {
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MOZ_ASSERT(mValueUs >= aOther.mValueUs);
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mValueUs -= aOther.mValueUs;
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}
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MFBT_API bool operator<(const AwakeTimeDuration& aOther) const {
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return mValueUs < aOther.mValueUs;
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}
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MFBT_API bool operator<=(const AwakeTimeDuration& aOther) const {
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return mValueUs <= aOther.mValueUs;
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}
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MFBT_API bool operator>=(const AwakeTimeDuration& aOther) const {
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return mValueUs >= aOther.mValueUs;
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}
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MFBT_API bool operator>(const AwakeTimeDuration& aOther) const {
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return mValueUs > aOther.mValueUs;
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}
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MFBT_API bool operator==(const AwakeTimeDuration& aOther) const {
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return mValueUs == aOther.mValueUs;
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}
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MFBT_API bool operator!=(const AwakeTimeDuration& aOther) const {
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return !(*this == aOther);
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}
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private:
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friend AwakeTimeStamp;
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// Not using a default value because we want this private, but allow creating
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// duration that are empty.
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explicit AwakeTimeDuration(uint64_t aValueUs) : mValueUs(aValueUs) {}
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uint64_t mValueUs;
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};
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}; // namespace mozilla
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#endif // mozilla_AwakeTimeStamp_h
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