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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 <wtf/MonotonicTime.h>
#include <wtf/RefCounted.h>
namespace WTF {
class Stopwatch : public RefCounted<Stopwatch> {
public:
static Ref<Stopwatch> create()
{
return adoptRef(*new Stopwatch());
}
void reset();
void start();
void stop();
Seconds elapsedTime();
Seconds elapsedTimeSince(MonotonicTime);
bool isActive() const { return !std::isnan(m_lastStartTime); }
private:
Stopwatch() { reset(); }
Seconds m_elapsedTime;
MonotonicTime m_lastStartTime;
};
inline void Stopwatch::reset()
{
m_elapsedTime = 0_s;
m_lastStartTime = MonotonicTime::nan();
}
inline void Stopwatch::start()
{
ASSERT_WITH_MESSAGE(std::isnan(m_lastStartTime), "Tried to start the stopwatch, but it is already running.");
m_lastStartTime = MonotonicTime::now();
}
inline void Stopwatch::stop()
{
ASSERT_WITH_MESSAGE(!std::isnan(m_lastStartTime), "Tried to stop the stopwatch, but it is not running.");
m_elapsedTime += MonotonicTime::now() - m_lastStartTime;
m_lastStartTime = MonotonicTime::nan();
}
inline Seconds Stopwatch::elapsedTime()
{
if (!isActive())
return m_elapsedTime;
return m_elapsedTime + (MonotonicTime::now() - m_lastStartTime);
}
inline Seconds Stopwatch::elapsedTimeSince(MonotonicTime timeStamp)
{
if (!isActive())
return m_elapsedTime;
return m_elapsedTime + (timeStamp - m_lastStartTime);
}
} // namespace WTF
using WTF::Stopwatch;