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/*
* Copyright (C) 2014 University of Washington. 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 AND ITS CONTRIBUTORS "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 OR ITS 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 <cmath>
#include <utility>
#include <wtf/MonotonicTime.h>
#include <wtf/Ref.h>
#include <wtf/RefCounted.h>
namespace WTF {
class Stopwatch final : public RefCounted<Stopwatch> {
public:
static Ref<Stopwatch> create()
{
return adoptRef(*new Stopwatch());
}
void reset();
void start();
void stop();
Seconds elapsedTime() const;
Seconds elapsedTimeSince(MonotonicTime) const;
std::tuple<Seconds, MonotonicTime> elapsedTimeAndTimestamp() const;
std::optional<Seconds> fromMonotonicTime(MonotonicTime) const;
bool isActive() const { return !m_lastStartTime.isNaN(); }
private:
Stopwatch() { reset(); }
Seconds m_elapsedTime;
MonotonicTime m_lastStartTime;
Vector<std::pair<MonotonicTime, MonotonicTime>> m_pastInternals;
};
inline void Stopwatch::reset()
{
m_elapsedTime = 0_s;
m_lastStartTime = MonotonicTime::nan();
}
inline void Stopwatch::start()
{
ASSERT_WITH_MESSAGE(m_lastStartTime.isNaN(), "Tried to start the stopwatch, but it is already running.");
m_lastStartTime = MonotonicTime::now();
}
inline void Stopwatch::stop()
{
ASSERT_WITH_MESSAGE(!m_lastStartTime.isNaN(), "Tried to stop the stopwatch, but it is not running.");
auto stopTime = MonotonicTime::now();
m_pastInternals.append({ m_lastStartTime, stopTime });
m_elapsedTime += stopTime - m_lastStartTime;
m_lastStartTime = MonotonicTime::nan();
}
inline Seconds Stopwatch::elapsedTime() const
{
return std::get<0>(elapsedTimeAndTimestamp());
}
inline std::tuple<Seconds, MonotonicTime> Stopwatch::elapsedTimeAndTimestamp() const
{
auto timestamp = MonotonicTime::now();
if (!isActive())
return std::tuple { m_elapsedTime, timestamp };
return std::tuple { m_elapsedTime + (timestamp - m_lastStartTime), timestamp };
}
inline Seconds Stopwatch::elapsedTimeSince(MonotonicTime timeStamp) const
{
if (!isActive())
return m_elapsedTime;
return m_elapsedTime + (timeStamp - m_lastStartTime);
}
inline std::optional<Seconds> Stopwatch::fromMonotonicTime(MonotonicTime timeStamp) const
{
if (!m_lastStartTime.isNaN() && m_lastStartTime < timeStamp)
return Stopwatch::elapsedTimeSince(timeStamp);
Seconds elapsedTime;
for (auto& interval : m_pastInternals) {
if (timeStamp < interval.first)
return std::nullopt;
if (interval.first <= timeStamp && timeStamp <= interval.second)
return elapsedTime + timeStamp - interval.first;
elapsedTime += interval.second - interval.first;
}
return std::nullopt;
}
} // namespace WTF
using WTF::Stopwatch;
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