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/*
* Copyright (C) 2023 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 "OpportunisticTaskScheduler.h"
#include "Page.h"
namespace WebCore {
OpportunisticTaskDeferralScope::OpportunisticTaskDeferralScope(OpportunisticTaskScheduler& scheduler)
: m_scheduler(&scheduler)
{
scheduler.incrementDeferralCount();
}
OpportunisticTaskDeferralScope::OpportunisticTaskDeferralScope(OpportunisticTaskDeferralScope&& scope)
: m_scheduler(std::exchange(scope.m_scheduler, { }))
{
}
OpportunisticTaskDeferralScope::~OpportunisticTaskDeferralScope()
{
if (m_scheduler)
m_scheduler->decrementDeferralCount();
}
OpportunisticTaskScheduler::OpportunisticTaskScheduler(Page& page)
: m_page(&page)
, m_runLoopObserver(makeUnique<RunLoopObserver>(RunLoopObserver::WellKnownOrder::PostRenderingUpdate, [weakThis = WeakPtr { this }] {
if (auto strongThis = weakThis.get())
strongThis->runLoopObserverFired();
}, RunLoopObserver::Type::OneShot))
{
}
OpportunisticTaskScheduler::~OpportunisticTaskScheduler() = default;
void OpportunisticTaskScheduler::reschedule(MonotonicTime deadline)
{
m_currentDeadline = deadline;
if (m_runLoopObserver->isScheduled())
return;
if (m_taskDeferralCount)
m_runLoopObserver->invalidate();
else
m_runLoopObserver->schedule();
}
std::unique_ptr<OpportunisticTaskDeferralScope> OpportunisticTaskScheduler::makeDeferralScope()
{
return makeUnique<OpportunisticTaskDeferralScope>(*this);
}
void OpportunisticTaskScheduler::runLoopObserverFired()
{
m_runLoopObserver->invalidate();
if (m_taskDeferralCount)
return;
auto deadline = std::exchange(m_currentDeadline, MonotonicTime { });
if (!deadline)
return;
if (ApproximateTime::now().secondsSinceEpoch() > deadline.secondsSinceEpoch())
return;
if (auto page = m_page.get())
page->performOpportunisticallyScheduledTasks(deadline);
}
void OpportunisticTaskScheduler::incrementDeferralCount()
{
if (++m_taskDeferralCount == 1)
m_runLoopObserver->invalidate();
}
void OpportunisticTaskScheduler::decrementDeferralCount()
{
if (!--m_taskDeferralCount && m_currentDeadline)
m_runLoopObserver->schedule();
}
} // namespace WebCore
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