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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.
*/
#pragma once
#include "RunLoopObserver.h"
#include <JavaScriptCore/EdenGCActivityCallback.h>
#include <JavaScriptCore/FullGCActivityCallback.h>
#include <JavaScriptCore/MarkedSpace.h>
#include <wtf/CheckedPtr.h>
#include <wtf/MonotonicTime.h>
#include <wtf/RefCounted.h>
#include <wtf/WeakPtr.h>
namespace WebCore {
class OpportunisticTaskScheduler;
class Page;
class ImminentlyScheduledWorkScope : public RefCounted<ImminentlyScheduledWorkScope> {
public:
static Ref<ImminentlyScheduledWorkScope> create(OpportunisticTaskScheduler& scheduler)
{
return adoptRef(*new ImminentlyScheduledWorkScope(scheduler));
}
~ImminentlyScheduledWorkScope();
private:
ImminentlyScheduledWorkScope(OpportunisticTaskScheduler&);
WeakPtr<OpportunisticTaskScheduler> m_scheduler;
};
class OpportunisticTaskScheduler final : public RefCounted<OpportunisticTaskScheduler>, public CanMakeWeakPtr<OpportunisticTaskScheduler> {
public:
static Ref<OpportunisticTaskScheduler> create(Page& page)
{
return adoptRef(*new OpportunisticTaskScheduler(page));
}
~OpportunisticTaskScheduler();
void willQueueIdleCallback() { m_mayHavePendingIdleCallbacks = true; }
bool isScheduled() const { return m_runLoopObserver->isScheduled(); }
void rescheduleIfNeeded(MonotonicTime deadline);
bool hasImminentlyScheduledWork() const { return m_imminentlyScheduledWorkCount; }
WARN_UNUSED_RETURN Ref<ImminentlyScheduledWorkScope> makeScheduledWorkScope();
class FullGCActivityCallback final : public JSC::FullGCActivityCallback {
public:
using Base = JSC::FullGCActivityCallback;
static Ref<FullGCActivityCallback> create(JSC::Heap& heap)
{
return adoptRef(*new FullGCActivityCallback(heap));
}
void doCollection(JSC::VM&) final;
private:
FullGCActivityCallback(JSC::Heap&);
JSC::VM& m_vm;
std::unique_ptr<RunLoopObserver> m_runLoopObserver;
JSC::HeapVersion m_version { 0 };
unsigned m_deferCount { 0 };
};
class EdenGCActivityCallback final : public JSC::EdenGCActivityCallback {
public:
using Base = JSC::EdenGCActivityCallback;
static Ref<EdenGCActivityCallback> create(JSC::Heap& heap)
{
return adoptRef(*new EdenGCActivityCallback(heap));
}
void doCollection(JSC::VM&) final;
private:
EdenGCActivityCallback(JSC::Heap&);
JSC::VM& m_vm;
std::unique_ptr<RunLoopObserver> m_runLoopObserver;
JSC::HeapVersion m_version { 0 };
unsigned m_deferCount { 0 };
};
private:
friend class ImminentlyScheduledWorkScope;
OpportunisticTaskScheduler(Page&);
void runLoopObserverFired();
bool isPageInactiveOrLoading() const;
bool shouldAllowOpportunisticallyScheduledTasks() const;
WeakPtr<Page> m_page;
uint64_t m_imminentlyScheduledWorkCount { 0 };
uint64_t m_runloopCountAfterBeingScheduled { 0 };
MonotonicTime m_currentDeadline;
std::unique_ptr<RunLoopObserver> m_runLoopObserver;
bool m_mayHavePendingIdleCallbacks { false };
};
} // namespace WebCore
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