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/*
* Copyright (C) 2014 Yoav Weiss (yoav@yoav.ws)
* Copyright (C) 2015 Akamai Technologies Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#ifndef Microtasks_h
#define Microtasks_h
#include "Timer.h"
#include <wtf/NeverDestroyed.h>
#include <wtf/Vector.h>
namespace WebCore {
class MicrotaskQueue;
class Microtask {
public:
virtual ~Microtask()
{
}
enum class Result {
Done,
KeepInQueue
};
virtual Result run() = 0;
protected:
void removeSelfFromQueue(MicrotaskQueue&);
};
class MicrotaskQueue {
friend NeverDestroyed<MicrotaskQueue>;
friend class Microtask;
public:
WEBCORE_EXPORT static MicrotaskQueue& mainThreadQueue();
WEBCORE_EXPORT MicrotaskQueue();
WEBCORE_EXPORT ~MicrotaskQueue();
WEBCORE_EXPORT void append(std::unique_ptr<Microtask>&&);
WEBCORE_EXPORT void performMicrotaskCheckpoint();
private:
WEBCORE_EXPORT void remove(const Microtask&);
void timerFired();
bool m_performingMicrotaskCheckpoint = false;
Vector<std::unique_ptr<Microtask>> m_microtaskQueue;
Vector<std::unique_ptr<Microtask>> m_tasksAppendedDuringMicrotaskCheckpoint;
// FIXME: Instead of a Timer, we should have a centralized Event Loop that calls performMicrotaskCheckpoint()
// on every iteration, implementing https://html.spec.whatwg.org/multipage/webappapis.html#processing-model-9
Timer m_timer;
};
} // namespace WebCore
#endif // Microtask_h
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