74 lines
2.4 KiB
C++
74 lines
2.4 KiB
C++
/*
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* Copyright (C) 2017 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. AND ITS CONTRIBUTORS ``AS IS''
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "CPUMonitor.h"
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namespace WebCore {
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CPUMonitor::CPUMonitor(Seconds checkInterval, ExceededCPULimitHandler&& exceededCPULimitHandler)
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: m_checkInterval(checkInterval)
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, m_exceededCPULimitHandler(WTFMove(exceededCPULimitHandler))
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, m_timer(*this, &CPUMonitor::timerFired)
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{
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}
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void CPUMonitor::setCPULimit(const std::optional<double>& cpuLimit)
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{
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if (m_cpuLimit == cpuLimit)
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return;
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m_cpuLimit = cpuLimit;
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if (m_cpuLimit) {
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if (!m_timer.isActive()) {
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m_lastCPUTime = CPUTime::get();
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m_timer.startRepeating(m_checkInterval);
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}
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} else
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m_timer.stop();
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}
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void CPUMonitor::timerFired()
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{
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ASSERT(m_cpuLimit);
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if (!m_lastCPUTime) {
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m_lastCPUTime = CPUTime::get();
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return;
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}
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auto cpuTime = CPUTime::get();
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if (!cpuTime)
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return;
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auto cpuUsagePercent = cpuTime.value().percentageCPUUsageSince(m_lastCPUTime.value());
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if (cpuUsagePercent > m_cpuLimit.value() * 100)
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m_exceededCPULimitHandler(cpuUsagePercent / 100.);
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m_lastCPUTime = cpuTime;
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}
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} // namespace WebCore
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