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