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64 lines
2.0 KiB
C++
64 lines
2.0 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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* Use AbstractThread::Create() to instantiate an AbstractThread. Note that
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* if you use different types than the ones currently supported (MediaTaskQueue
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* and nsIThread), you'll need to implement the relevant guts in
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* AbstractThread.cpp to avoid linkage errors.
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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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template<typename TargetType> static AbstractThread* Create(TargetType* aTarget);
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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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template<typename TargetType>
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AbstractThread*
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AbstractThread::Create(TargetType* aTarget)
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{
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return new AbstractThreadImpl<TargetType>(aTarget);
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};
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} // namespace mozilla
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#endif
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