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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/atomicops.h"
#include "webrtc/base/checks.h"
#include "webrtc/base/logging.h"
namespace rtc {
AsyncInvoker::AsyncInvoker() : invocation_complete_(false, false) {}
AsyncInvoker::~AsyncInvoker() {
destroying_ = true;
// Messages for this need to be cleared *before* our destructor is complete.
MessageQueueManager::Clear(this);
// And we need to wait for any invocations that are still in progress on
// other threads.
while (AtomicOps::AcquireLoad(&pending_invocations_)) {
// If the destructor was called while AsyncInvoke was being called by
// another thread, WITHIN an AsyncInvoked functor, it may do another
// Thread::Post even after we called MessageQueueManager::Clear(this). So
// we need to keep calling Clear to discard these posts.
MessageQueueManager::Clear(this);
invocation_complete_.Wait(Event::kForever);
}
}
void AsyncInvoker::OnMessage(Message* msg) {
// Get the AsyncClosure shared ptr from this message's data.
ScopedMessageData<AsyncClosure>* data =
static_cast<ScopedMessageData<AsyncClosure>*>(msg->pdata);
// Execute the closure and trigger the return message if needed.
data->inner_data().Execute();
delete data;
}
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>(RTC_FROM_HERE,
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->posted_from, it->phandler, it->message_id, it->pdata);
}
}
void AsyncInvoker::DoInvoke(const Location& posted_from,
Thread* thread,
std::unique_ptr<AsyncClosure> closure,
uint32_t id) {
if (destroying_) {
LOG(LS_WARNING) << "Tried to invoke while destroying the invoker.";
return;
}
AtomicOps::Increment(&pending_invocations_);
thread->Post(posted_from, this, id,
new ScopedMessageData<AsyncClosure>(std::move(closure)));
}
void AsyncInvoker::DoInvokeDelayed(const Location& posted_from,
Thread* thread,
std::unique_ptr<AsyncClosure> closure,
uint32_t delay_ms,
uint32_t id) {
if (destroying_) {
LOG(LS_WARNING) << "Tried to invoke while destroying the invoker.";
return;
}
AtomicOps::Increment(&pending_invocations_);
thread->PostDelayed(posted_from, delay_ms, this, id,
new ScopedMessageData<AsyncClosure>(std::move(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;
}
AsyncClosure::~AsyncClosure() {
AtomicOps::Decrement(&invoker_->pending_invocations_);
invoker_->invocation_complete_.Set();
}
} // namespace rtc
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