96 lines
2.8 KiB
C++
96 lines
2.8 KiB
C++
/*
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* Copyright (C) 2014 University of Washington. 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 AND ITS CONTRIBUTORS "AS IS" AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY 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 OF
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* 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 <cmath>
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#include <wtf/MonotonicTime.h>
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#include <wtf/Ref.h>
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#include <wtf/RefCounted.h>
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namespace WTF {
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class Stopwatch : public RefCounted<Stopwatch> {
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public:
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static Ref<Stopwatch> create()
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{
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return adoptRef(*new Stopwatch());
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}
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void reset();
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void start();
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void stop();
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Seconds elapsedTime() const;
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Seconds elapsedTimeSince(MonotonicTime) const;
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bool isActive() const { return !std::isnan(m_lastStartTime); }
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private:
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Stopwatch() { reset(); }
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Seconds m_elapsedTime;
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MonotonicTime m_lastStartTime;
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};
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inline void Stopwatch::reset()
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{
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m_elapsedTime = 0_s;
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m_lastStartTime = MonotonicTime::nan();
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}
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inline void Stopwatch::start()
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{
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ASSERT_WITH_MESSAGE(std::isnan(m_lastStartTime), "Tried to start the stopwatch, but it is already running.");
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m_lastStartTime = MonotonicTime::now();
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}
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inline void Stopwatch::stop()
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{
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ASSERT_WITH_MESSAGE(!std::isnan(m_lastStartTime), "Tried to stop the stopwatch, but it is not running.");
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m_elapsedTime += MonotonicTime::now() - m_lastStartTime;
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m_lastStartTime = MonotonicTime::nan();
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}
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inline Seconds Stopwatch::elapsedTime() const
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{
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if (!isActive())
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return m_elapsedTime;
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return m_elapsedTime + (MonotonicTime::now() - m_lastStartTime);
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}
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inline Seconds Stopwatch::elapsedTimeSince(MonotonicTime timeStamp) const
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{
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if (!isActive())
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return m_elapsedTime;
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return m_elapsedTime + (timeStamp - m_lastStartTime);
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}
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} // namespace WTF
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using WTF::Stopwatch;
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