9cf037b831
R=mallinath@webrtc.org Review URL: https://webrtc-codereview.appspot.com/8139004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@5502 4adac7df-926f-26a2-2b94-8c16560cd09d
102 lines
3.5 KiB
C++
102 lines
3.5 KiB
C++
/*
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* libjingle
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* Copyright 2014 Google Inc.
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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 met:
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*
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* 1. Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef TALK_BASE_ASYNCINVOKER_INL_H_
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#define TALK_BASE_ASYNCINVOKER_INL_H_
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#include "talk/base/criticalsection.h"
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#include "talk/base/messagehandler.h"
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#include "talk/base/sigslot.h"
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#include "talk/base/thread.h"
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namespace talk_base {
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// Helper class for AsyncInvoker. Runs a functor on a message queue or thread
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// and doesn't execute the callback when finished if the calling thread ends.
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template <class ReturnT, class FunctorT>
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class AsyncFunctorMessageHandler
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: public FunctorMessageHandler<ReturnT, FunctorT>,
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public sigslot::has_slots<> {
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typedef AsyncFunctorMessageHandler<ReturnT, FunctorT> ThisT;
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public:
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explicit AsyncFunctorMessageHandler(const FunctorT& functor)
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: FunctorMessageHandler<ReturnT, FunctorT>(functor),
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thread_(Thread::Current()),
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shutting_down_(false) {
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thread_->SignalQueueDestroyed.connect(this, &ThisT::OnThreadDestroyed);
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}
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virtual ~AsyncFunctorMessageHandler() {
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CritScope cs(&running_crit_);
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shutting_down_ = true;
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}
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virtual void OnMessage(Message* msg) {
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CritScope cs(&running_crit_);
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if (!shutting_down_) {
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FunctorMessageHandler<ReturnT, FunctorT>::OnMessage(msg);
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}
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}
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// Returns the thread that initiated the async call.
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Thread* thread() const { return thread_; }
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// Wraps a callback so that it won't execute if |thread_| goes away.
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void WrapCallback(Callback0<void> cb) {
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this->SetCallback(
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Callback0<void>(Bind(&ThisT::MaybeRunCallback, this, cb)));
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}
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private:
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void OnThreadDestroyed() {
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CritScope cs(&thread_crit_);
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thread_ = NULL;
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this->SetCallback(Callback0<void>()); // Clear out the callback.
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}
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void MaybeRunCallback(Callback0<void> cb) {
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#ifdef _DEBUG
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ASSERT(running_crit_.CurrentThreadIsOwner());
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#endif
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CritScope cs(&thread_crit_);
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if (thread_ && !shutting_down_) {
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cb();
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}
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}
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FunctorT functor_;
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Thread* thread_;
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CriticalSection thread_crit_;
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CriticalSection running_crit_;
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bool shutting_down_;
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};
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} // namespace talk_base
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#endif // TALK_BASE_ASYNCINVOKER_INL_H_
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