218 lines
6.2 KiB
C++
218 lines
6.2 KiB
C++
/*
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* Copyright (C) 2016-2019 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <wtf/ClockType.h>
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#include <wtf/Seconds.h>
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namespace WTF {
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class WallTime;
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class PrintStream;
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// The current time according to a monotonic clock. Monotonic clocks don't go backwards and
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// possibly don't count downtime. This uses floating point internally so that you can reason about
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// infinity and other things that arise in math. It's acceptable to use this to wrap NaN times,
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// negative times, and infinite times, so long as they are all relative to the same clock.
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class MonotonicTime final {
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WTF_MAKE_FAST_ALLOCATED;
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public:
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static constexpr ClockType clockType = ClockType::Monotonic;
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// This is the epoch. So, x.secondsSinceEpoch() should be the same as x - MonotonicTime().
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constexpr MonotonicTime() { }
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// Call this if you know for sure that the double represents monotonic time according to the
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// same time source as MonotonicTime. It must be in seconds.
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static constexpr MonotonicTime fromRawSeconds(double value)
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{
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return MonotonicTime(value);
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}
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#if OS(DARWIN)
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WTF_EXPORT_PRIVATE static MonotonicTime fromMachAbsoluteTime(uint64_t);
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WTF_EXPORT_PRIVATE uint64_t toMachAbsoluteTime() const;
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#endif
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WTF_EXPORT_PRIVATE static MonotonicTime now();
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static constexpr MonotonicTime infinity() { return fromRawSeconds(std::numeric_limits<double>::infinity()); }
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static constexpr MonotonicTime nan() { return fromRawSeconds(std::numeric_limits<double>::quiet_NaN()); }
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constexpr Seconds secondsSinceEpoch() const { return Seconds(m_value); }
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MonotonicTime approximateMonotonicTime() const { return *this; }
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WTF_EXPORT_PRIVATE WallTime approximateWallTime() const;
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explicit constexpr operator bool() const { return !!m_value; }
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constexpr MonotonicTime operator+(Seconds other) const
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{
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return fromRawSeconds(m_value + other.value());
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}
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constexpr MonotonicTime operator-(Seconds other) const
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{
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return fromRawSeconds(m_value - other.value());
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}
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Seconds operator%(Seconds other) const
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{
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return Seconds { fmod(m_value, other.value()) };
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}
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// Time is a scalar and scalars can be negated as this could arise from algebraic
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// transformations. So, we allow it.
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constexpr MonotonicTime operator-() const
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{
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return fromRawSeconds(-m_value);
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}
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MonotonicTime operator+=(Seconds other)
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{
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return *this = *this + other;
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}
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MonotonicTime operator-=(Seconds other)
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{
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return *this = *this - other;
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}
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constexpr Seconds operator-(MonotonicTime other) const
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{
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return Seconds(m_value - other.m_value);
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}
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constexpr bool operator==(MonotonicTime other) const
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{
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return m_value == other.m_value;
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}
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constexpr bool operator!=(MonotonicTime other) const
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{
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return m_value != other.m_value;
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}
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constexpr bool operator<(MonotonicTime other) const
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{
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return m_value < other.m_value;
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}
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constexpr bool operator>(MonotonicTime other) const
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{
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return m_value > other.m_value;
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}
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constexpr bool operator<=(MonotonicTime other) const
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{
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return m_value <= other.m_value;
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}
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constexpr bool operator>=(MonotonicTime other) const
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{
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return m_value >= other.m_value;
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}
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WTF_EXPORT_PRIVATE void dump(PrintStream&) const;
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MonotonicTime isolatedCopy() const
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{
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return *this;
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}
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template<class Encoder>
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void encode(Encoder& encoder) const
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{
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encoder << m_value;
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}
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template<class Decoder>
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static std::optional<MonotonicTime> decode(Decoder& decoder)
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{
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std::optional<double> time;
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decoder >> time;
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if (!time)
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return std::nullopt;
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return MonotonicTime::fromRawSeconds(*time);
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}
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template<class Decoder>
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static WARN_UNUSED_RETURN bool decode(Decoder& decoder, MonotonicTime& time)
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{
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double value;
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if (!decoder.decode(value))
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return false;
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time = MonotonicTime::fromRawSeconds(value);
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return true;
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}
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struct MarkableTraits;
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private:
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constexpr MonotonicTime(double rawValue)
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: m_value(rawValue)
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{
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}
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double m_value { 0 };
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};
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struct MonotonicTime::MarkableTraits {
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static bool isEmptyValue(MonotonicTime time)
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{
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return std::isnan(time.m_value);
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}
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static constexpr MonotonicTime emptyValue()
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{
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return MonotonicTime::nan();
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}
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};
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} // namespace WTF
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namespace std {
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inline bool isnan(WTF::MonotonicTime time)
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{
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return std::isnan(time.secondsSinceEpoch().value());
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}
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inline bool isinf(WTF::MonotonicTime time)
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{
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return std::isinf(time.secondsSinceEpoch().value());
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}
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inline bool isfinite(WTF::MonotonicTime time)
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{
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return std::isfinite(time.secondsSinceEpoch().value());
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}
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} // namespace std
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using WTF::MonotonicTime;
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