зеркало из https://github.com/mozilla/gecko-dev.git
122 строки
4.0 KiB
C++
122 строки
4.0 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_ThreadEventQueue_h
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#define mozilla_ThreadEventQueue_h
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#include "mozilla/AbstractEventQueue.h"
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#include "mozilla/CondVar.h"
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#include "mozilla/SynchronizedEventQueue.h"
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#include "nsCOMPtr.h"
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#include "nsTArray.h"
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class nsIEventTarget;
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class nsISerialEventTarget;
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class nsIThreadObserver;
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namespace mozilla {
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class EventQueue;
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template<typename InnerQueueT>
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class PrioritizedEventQueue;
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class ThreadEventTarget;
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// A ThreadEventQueue implements normal monitor-style synchronization over the
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// InnerQueueT AbstractEventQueue. It also implements PushEventQueue and
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// PopEventQueue for workers (see the documentation below for an explanation of
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// those). All threads use a ThreadEventQueue as their event queue. InnerQueueT
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// is a template parameter to avoid virtual dispatch overhead.
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template<class InnerQueueT>
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class ThreadEventQueue final : public SynchronizedEventQueue
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{
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public:
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explicit ThreadEventQueue(UniquePtr<InnerQueueT> aQueue);
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bool PutEvent(already_AddRefed<nsIRunnable>&& aEvent,
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EventPriority aPriority) final;
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already_AddRefed<nsIRunnable> GetEvent(bool aMayWait,
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EventPriority* aPriority) final;
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bool HasPendingEvent() final;
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bool ShutdownIfNoPendingEvents() final;
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void Disconnect(const MutexAutoLock& aProofOfLock) final {}
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void EnableInputEventPrioritization() final;
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void FlushInputEventPrioritization() final;
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void SuspendInputEventPrioritization() final;
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void ResumeInputEventPrioritization() final;
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/**
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* This method causes any events currently enqueued on the thread to be
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* suppressed until PopEventQueue is called, and any event dispatched to this
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* thread's nsIEventTarget will queue as well. Calls to PushEventQueue may be
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* nested and must each be paired with a call to PopEventQueue in order to
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* restore the original state of the thread. The returned nsIEventTarget may
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* be used to push events onto the nested queue. Dispatching will be disabled
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* once the event queue is popped. The thread will only ever process pending
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* events for the innermost event queue. Must only be called on the target
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* thread.
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*/
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already_AddRefed<nsISerialEventTarget> PushEventQueue();
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/**
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* Revert a call to PushEventQueue. When an event queue is popped, any events
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* remaining in the queue are appended to the elder queue. This also causes
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* the nsIEventTarget returned from PushEventQueue to stop dispatching events.
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* Must only be called on the target thread, and with the innermost event
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* queue.
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*/
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void PopEventQueue(nsIEventTarget* aTarget);
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already_AddRefed<nsIThreadObserver> GetObserver() final;
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already_AddRefed<nsIThreadObserver> GetObserverOnThread() final;
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void SetObserver(nsIThreadObserver* aObserver) final;
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Mutex& MutexRef() { return mLock; }
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private:
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class NestedSink;
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virtual ~ThreadEventQueue();
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bool PutEventInternal(already_AddRefed<nsIRunnable>&& aEvent,
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EventPriority aPriority,
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NestedSink* aQueue);
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UniquePtr<InnerQueueT> mBaseQueue;
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struct NestedQueueItem
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{
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UniquePtr<EventQueue> mQueue;
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RefPtr<ThreadEventTarget> mEventTarget;
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NestedQueueItem(UniquePtr<EventQueue> aQueue,
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ThreadEventTarget* aEventTarget)
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: mQueue(Move(aQueue))
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, mEventTarget(aEventTarget)
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{}
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};
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nsTArray<NestedQueueItem> mNestedQueues;
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Mutex mLock;
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CondVar mEventsAvailable;
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bool mEventsAreDoomed = false;
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nsCOMPtr<nsIThreadObserver> mObserver;
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};
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extern template class ThreadEventQueue<EventQueue>;
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extern template class ThreadEventQueue<PrioritizedEventQueue<EventQueue>>;
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}; // namespace mozilla
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#endif // mozilla_ThreadEventQueue_h
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