forked from mirrors/gecko-dev
95 lines
3.1 KiB
C++
95 lines
3.1 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/EventQueue.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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class ThreadEventTarget;
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// A ThreadEventQueue implements normal monitor-style synchronization over the
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// EventQueue. It also implements PushEventQueue and PopEventQueue for workers
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// (see the documentation below for an explanation of those). All threads use a
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// ThreadEventQueue as their event queue. Although for the main thread this
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// simply forwards events to the TaskController.
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class ThreadEventQueue final : public SynchronizedEventQueue {
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public:
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explicit ThreadEventQueue(UniquePtr<EventQueue> aQueue,
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bool aIsMainThread = false);
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bool PutEvent(already_AddRefed<nsIRunnable>&& aEvent,
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EventQueuePriority aPriority) final;
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already_AddRefed<nsIRunnable> GetEvent(
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bool aMayWait, mozilla::TimeDuration* aLastEventDelay = nullptr) 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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nsresult RegisterShutdownTask(nsITargetShutdownTask* aTask) final;
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nsresult UnregisterShutdownTask(nsITargetShutdownTask* aTask) final;
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void RunShutdownTasks() final;
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already_AddRefed<nsISerialEventTarget> PushEventQueue() final;
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void PopEventQueue(nsIEventTarget* aTarget) final;
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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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size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) override;
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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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EventQueuePriority aPriority, NestedSink* aQueue);
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const UniquePtr<EventQueue> mBaseQueue MOZ_GUARDED_BY(mLock);
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struct NestedQueueItem {
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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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};
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nsTArray<NestedQueueItem> mNestedQueues MOZ_GUARDED_BY(mLock);
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Mutex mLock;
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CondVar mEventsAvailable MOZ_GUARDED_BY(mLock);
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bool mEventsAreDoomed MOZ_GUARDED_BY(mLock) = false;
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nsCOMPtr<nsIThreadObserver> mObserver MOZ_GUARDED_BY(mLock);
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nsTArray<nsCOMPtr<nsITargetShutdownTask>> mShutdownTasks
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MOZ_GUARDED_BY(mLock);
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bool mShutdownTasksRun MOZ_GUARDED_BY(mLock) = false;
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const bool mIsMainThread;
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};
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} // namespace mozilla
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#endif // mozilla_ThreadEventQueue_h
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