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/*
* Copyright 2014 The WebRTC Project Authors. All rights reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "webrtc/base/asyncinvoker.h"
#include "webrtc/base/checks.h"
#include "webrtc/base/logging.h"
namespace rtc {
AsyncInvoker::AsyncInvoker() : destroying_(false) {}
AsyncInvoker::~AsyncInvoker() {
destroying_ = true;
SignalInvokerDestroyed();
// Messages for this need to be cleared *before* our destructor is complete.
MessageQueueManager::Clear(this);
}
void AsyncInvoker::OnMessage(Message* msg) {
// Get the AsyncClosure shared ptr from this message's data.
ScopedRefMessageData<AsyncClosure>* data =
static_cast<ScopedRefMessageData<AsyncClosure>*>(msg->pdata);
scoped_refptr<AsyncClosure> closure = data->data();
delete msg->pdata;
msg->pdata = NULL;
// Execute the closure and trigger the return message if needed.
closure->Execute();
}
void AsyncInvoker::Flush(Thread* thread, uint32_t id /*= MQID_ANY*/) {
if (destroying_) return;
// Run this on |thread| to reduce the number of context switches.
if (Thread::Current() != thread) {
thread->Invoke<void>(Bind(&AsyncInvoker::Flush, this, thread, id));
return;
}
MessageList removed;
thread->Clear(this, id, &removed);
for (MessageList::iterator it = removed.begin(); it != removed.end(); ++it) {
// This message was pending on this thread, so run it now.
thread->Send(it->phandler,
it->message_id,
it->pdata);
}
}
void AsyncInvoker::DoInvoke(Thread* thread,
const scoped_refptr<AsyncClosure>& closure,
uint32_t id) {
if (destroying_) {
LOG(LS_WARNING) << "Tried to invoke while destroying the invoker.";
return;
}
thread->Post(this, id, new ScopedRefMessageData<AsyncClosure>(closure));
}
void AsyncInvoker::DoInvokeDelayed(Thread* thread,
const scoped_refptr<AsyncClosure>& closure,
uint32_t delay_ms,
uint32_t id) {
if (destroying_) {
LOG(LS_WARNING) << "Tried to invoke while destroying the invoker.";
return;
}
thread->PostDelayed(delay_ms, this, id,
new ScopedRefMessageData<AsyncClosure>(closure));
}
GuardedAsyncInvoker::GuardedAsyncInvoker() : thread_(Thread::Current()) {
thread_->SignalQueueDestroyed.connect(this,
&GuardedAsyncInvoker::ThreadDestroyed);
}
GuardedAsyncInvoker::~GuardedAsyncInvoker() {
}
bool GuardedAsyncInvoker::Flush(uint32_t id) {
rtc::CritScope cs(&crit_);
if (thread_ == nullptr)
return false;
invoker_.Flush(thread_, id);
return true;
}
void GuardedAsyncInvoker::ThreadDestroyed() {
rtc::CritScope cs(&crit_);
// We should never get more than one notification about the thread dying.
RTC_DCHECK(thread_ != nullptr);
thread_ = nullptr;
}
NotifyingAsyncClosureBase::NotifyingAsyncClosureBase(AsyncInvoker* invoker,
Thread* calling_thread)
: invoker_(invoker), calling_thread_(calling_thread) {
calling_thread->SignalQueueDestroyed.connect(
this, &NotifyingAsyncClosureBase::CancelCallback);
invoker->SignalInvokerDestroyed.connect(
this, &NotifyingAsyncClosureBase::CancelCallback);
}
NotifyingAsyncClosureBase::~NotifyingAsyncClosureBase() {
disconnect_all();
}
void NotifyingAsyncClosureBase::TriggerCallback() {
CritScope cs(&crit_);
if (!CallbackCanceled() && !callback_.empty()) {
invoker_->AsyncInvoke<void>(calling_thread_, callback_);
}
}
void NotifyingAsyncClosureBase::CancelCallback() {
// If the callback is triggering when this is called, block the
// destructor of the dying object here by waiting until the callback
// is done triggering.
CritScope cs(&crit_);
// calling_thread_ == NULL means do not trigger the callback.
calling_thread_ = NULL;
}
} // namespace rtc
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