зеркало из https://github.com/mozilla/gecko-dev.git
67 строки
2.3 KiB
C++
67 строки
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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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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#if !defined(AbstractThread_h_)
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#define AbstractThread_h_
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#include "nscore.h"
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#include "nsIRunnable.h"
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#include "nsISupportsImpl.h"
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#include "nsIThread.h"
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#include "nsRefPtr.h"
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namespace mozilla {
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/*
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* We often want to run tasks on a target that guarantees that events will never
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* run in parallel. There are various target types that achieve this - namely
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* nsIThread and MediaTaskQueue. Note that nsIThreadPool (which implements
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* nsIEventTarget) does not have this property, so we do not want to use
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* nsIEventTarget for this purpose. This class encapsulates the specifics of
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* the structures we might use here and provides a consistent interface.
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*
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* At present, the supported AbstractThread implementations are MediaTaskQueue
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* and AbstractThread::MainThread. If you add support for another thread that is
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* not the MainThread, you'll need to figure out how to make it unique such that
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* comparing AbstractThread pointers is equivalent to comparing nsIThread pointers.
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*/
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class AbstractThread
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{
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public:
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NS_INLINE_DECL_THREADSAFE_REFCOUNTING(AbstractThread);
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virtual nsresult Dispatch(already_AddRefed<nsIRunnable> aRunnable) = 0;
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virtual bool IsCurrentThreadIn() = 0;
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// Convenience method for dispatching a runnable when we may be running on
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// a thread that requires runnables to be dispatched with tail dispatch.
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void MaybeTailDispatch(already_AddRefed<nsIRunnable> aRunnable,
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bool aAssertDispatchSuccess = true);
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// Convenience method for getting an AbstractThread for the main thread.
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static AbstractThread* MainThread();
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// Must be called exactly once during startup.
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static void InitStatics();
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protected:
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virtual ~AbstractThread() {}
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};
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template<typename TargetType>
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class AbstractThreadImpl : public AbstractThread
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{
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public:
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explicit AbstractThreadImpl(TargetType* aTarget) : mTarget(aTarget) {}
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virtual nsresult Dispatch(already_AddRefed<nsIRunnable> aRunnable);
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virtual bool IsCurrentThreadIn();
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private:
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nsRefPtr<TargetType> mTarget;
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};
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} // namespace mozilla
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#endif
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