1/* 2 * Copyright 2014 The WebRTC Project Authors. All rights reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11#include "webrtc/base/asyncinvoker.h" 12 13namespace rtc { 14 15AsyncInvoker::AsyncInvoker() : destroying_(false) {} 16 17AsyncInvoker::~AsyncInvoker() { 18 destroying_ = true; 19 SignalInvokerDestroyed(); 20 // Messages for this need to be cleared *before* our destructor is complete. 21 MessageQueueManager::Clear(this); 22} 23 24void AsyncInvoker::OnMessage(Message* msg) { 25 // Get the AsyncClosure shared ptr from this message's data. 26 ScopedRefMessageData<AsyncClosure>* data = 27 static_cast<ScopedRefMessageData<AsyncClosure>*>(msg->pdata); 28 scoped_refptr<AsyncClosure> closure = data->data(); 29 delete msg->pdata; 30 msg->pdata = NULL; 31 32 // Execute the closure and trigger the return message if needed. 33 closure->Execute(); 34} 35 36void AsyncInvoker::Flush(Thread* thread, uint32 id /*= MQID_ANY*/) { 37 if (destroying_) return; 38 39 // Run this on |thread| to reduce the number of context switches. 40 if (Thread::Current() != thread) { 41 thread->Invoke<void>(Bind(&AsyncInvoker::Flush, this, thread, id)); 42 return; 43 } 44 45 MessageList removed; 46 thread->Clear(this, id, &removed); 47 for (MessageList::iterator it = removed.begin(); it != removed.end(); ++it) { 48 // This message was pending on this thread, so run it now. 49 thread->Send(it->phandler, 50 it->message_id, 51 it->pdata); 52 } 53} 54 55void AsyncInvoker::DoInvoke(Thread* thread, AsyncClosure* closure, 56 uint32 id) { 57 if (destroying_) { 58 LOG(LS_WARNING) << "Tried to invoke while destroying the invoker."; 59 // Since this call transwers ownership of |closure|, we clean it up here. 60 delete closure; 61 return; 62 } 63 thread->Post(this, id, new ScopedRefMessageData<AsyncClosure>(closure)); 64} 65 66NotifyingAsyncClosureBase::NotifyingAsyncClosureBase(AsyncInvoker* invoker, 67 Thread* calling_thread) 68 : invoker_(invoker), calling_thread_(calling_thread) { 69 calling_thread->SignalQueueDestroyed.connect( 70 this, &NotifyingAsyncClosureBase::CancelCallback); 71 invoker->SignalInvokerDestroyed.connect( 72 this, &NotifyingAsyncClosureBase::CancelCallback); 73} 74 75void NotifyingAsyncClosureBase::TriggerCallback() { 76 CritScope cs(&crit_); 77 if (!CallbackCanceled() && !callback_.empty()) { 78 invoker_->AsyncInvoke<void>(calling_thread_, callback_); 79 } 80} 81 82void NotifyingAsyncClosureBase::CancelCallback() { 83 // If the callback is triggering when this is called, block the 84 // destructor of the dying object here by waiting until the callback 85 // is done triggering. 86 CritScope cs(&crit_); 87 // calling_thread_ == NULL means do not trigger the callback. 88 calling_thread_ = NULL; 89} 90 91} // namespace rtc 92