blob: e275673ccb4b206e794abd6a27a443c4c73c5283 [file] [log] [blame]
/*
* Copyright (C) 2017 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. 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 INC. 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.
*/
#include "config.h"
#include "CPUMonitor.h"
namespace WebCore {
CPUMonitor::CPUMonitor(Seconds checkInterval, ExceededCPULimitHandler&& exceededCPULimitHandler)
: m_checkInterval(checkInterval)
, m_exceededCPULimitHandler(WTFMove(exceededCPULimitHandler))
, m_timer(*this, &CPUMonitor::timerFired)
{
}
void CPUMonitor::setCPULimit(const std::optional<double>& cpuLimit)
{
if (m_cpuLimit == cpuLimit)
return;
m_cpuLimit = cpuLimit;
if (m_cpuLimit) {
if (!m_timer.isActive()) {
m_lastCPUTime = CPUTime::get();
m_timer.startRepeating(m_checkInterval);
}
} else
m_timer.stop();
}
void CPUMonitor::timerFired()
{
ASSERT(m_cpuLimit);
if (!m_lastCPUTime) {
m_lastCPUTime = CPUTime::get();
return;
}
auto cpuTime = CPUTime::get();
if (!cpuTime)
return;
auto cpuUsagePercent = cpuTime.value().percentageCPUUsageSince(m_lastCPUTime.value());
if (cpuUsagePercent > m_cpuLimit.value() * 100)
m_exceededCPULimitHandler(cpuUsagePercent / 100.);
m_lastCPUTime = cpuTime;
}
} // namespace WebCore