79 lines
2.6 KiB
C++
79 lines
2.6 KiB
C++
/*
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* Copyright (C) 2010 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include "GCReachableRef.h"
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#include <wtf/Forward.h>
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#include <wtf/Noncopyable.h>
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#include <wtf/Ref.h>
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#include <wtf/Vector.h>
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namespace WebCore {
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class Event;
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class EventQueueScope;
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class ScopedEventQueue {
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WTF_MAKE_NONCOPYABLE(ScopedEventQueue); WTF_MAKE_FAST_ALLOCATED;
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public:
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static ScopedEventQueue& singleton();
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void enqueueEvent(Ref<Event>&&);
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private:
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ScopedEventQueue() = default;
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~ScopedEventQueue() = delete;
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struct ScopedEvent {
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Ref<Event> event;
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GCReachableRef<Node> target;
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};
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void dispatchEvent(const ScopedEvent&) const;
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void dispatchAllEvents();
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void incrementScopingLevel();
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void decrementScopingLevel();
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Vector<ScopedEvent> m_queuedEvents;
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unsigned m_scopingLevel { 0 };
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friend class WTF::NeverDestroyed<WebCore::ScopedEventQueue>;
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friend class EventQueueScope;
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};
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class EventQueueScope {
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WTF_MAKE_NONCOPYABLE(EventQueueScope);
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public:
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EventQueueScope() { ScopedEventQueue::singleton().incrementScopingLevel(); }
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~EventQueueScope() { ScopedEventQueue::singleton().decrementScopingLevel(); }
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};
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} // namespace WebCore
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