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/*
* Copyright (C) 2017-2023 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. ``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
* 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 "JSCast.h"
#include "JSRunLoopTimer.h"
#include "Strong.h"
#include <wtf/Deque.h>
#include <wtf/FixedVector.h>
#include <wtf/HashSet.h>
#include <wtf/Lock.h>
#include <wtf/TZoneMalloc.h>
#include <wtf/Vector.h>
namespace JSC {
class JSPromise;
class VM;
class JSCell;
class DeferredWorkTimer final : public JSRunLoopTimer {
public:
using Base = JSRunLoopTimer;
struct TicketData {
private:
WTF_MAKE_TZONE_ALLOCATED(TicketData);
public:
inline TicketData(VM&, JSObject* scriptExecutionOwner, Vector<Strong<JSCell>>&& dependencies);
inline VM& vm();
JSObject* target();
inline void cancel();
bool isCancelled() const { return !scriptExecutionOwner.get(); }
FixedVector<Strong<JSCell>> dependencies;
Strong<JSObject> scriptExecutionOwner;
};
using Ticket = TicketData*;
void doWork(VM&) final;
JS_EXPORT_PRIVATE Ticket addPendingWork(VM&, JSObject* target, Vector<Strong<JSCell>>&& dependencies);
bool hasAnyPendingWork() const;
bool hasPendingWork(Ticket);
bool hasDependancyInPendingWork(Ticket, JSCell* dependency);
bool cancelPendingWork(Ticket);
// If the script execution owner your ticket is associated with gets canceled
// the Task will not be called and will be deallocated. So it's important
// to make sure your memory ownership model won't leak memory when
// this occurs. The easiest way is to make sure everything is either owned
// by a GC'd value in dependencies or by the Task lambda.
using Task = Function<void(Ticket)>;
JS_EXPORT_PRIVATE void scheduleWorkSoon(Ticket, Task&&);
JS_EXPORT_PRIVATE void didResumeScriptExecutionOwner();
void stopRunningTasks() { m_runTasks = false; }
JS_EXPORT_PRIVATE void runRunLoop();
static Ref<DeferredWorkTimer> create(VM& vm) { return adoptRef(*new DeferredWorkTimer(vm)); }
private:
DeferredWorkTimer(VM&);
Lock m_taskLock;
bool m_runTasks { true };
bool m_shouldStopRunLoopWhenAllTicketsFinish { false };
bool m_currentlyRunningTask { false };
Deque<std::tuple<Ticket, Task>> m_tasks WTF_GUARDED_BY_LOCK(m_taskLock);
HashSet<std::unique_ptr<TicketData>> m_pendingTickets;
};
inline JSObject* DeferredWorkTimer::TicketData::target()
{
ASSERT(!isCancelled());
return jsCast<JSObject*>(dependencies.last().get());
}
} // namespace JSC
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