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/*
* Copyright 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
template <typename T>
Queue<T>::Queue(size_t capacity) : enqueue_(capacity), dequeue_(0){};
template <typename T>
Queue<T>::~Queue() {
ASSERT_LOG(enqueue_.handler_ == nullptr, "Enqueue is not unregistered");
ASSERT_LOG(dequeue_.handler_ == nullptr, "Dequeue is not unregistered");
};
template <typename T>
void Queue<T>::RegisterEnqueue(Handler* handler, EnqueueCallback callback) {
std::lock_guard<std::mutex> lock(mutex_);
ASSERT(enqueue_.handler_ == nullptr);
ASSERT(enqueue_.reactable_ == nullptr);
enqueue_.handler_ = handler;
enqueue_.reactable_ = enqueue_.handler_->thread_->GetReactor()->Register(
enqueue_.reactive_semaphore_.GetFd(),
base::Bind(&Queue<T>::EnqueueCallbackInternal, base::Unretained(this), std::move(callback)),
base::Closure());
}
template <typename T>
void Queue<T>::UnregisterEnqueue() {
Reactor* reactor = nullptr;
Reactor::Reactable* to_unregister = nullptr;
bool wait_for_unregister = false;
{
std::lock_guard<std::mutex> lock(mutex_);
ASSERT(enqueue_.reactable_ != nullptr);
reactor = enqueue_.handler_->thread_->GetReactor();
wait_for_unregister = (!enqueue_.handler_->thread_->IsSameThread());
to_unregister = enqueue_.reactable_;
enqueue_.reactable_ = nullptr;
enqueue_.handler_ = nullptr;
}
reactor->Unregister(to_unregister);
if (wait_for_unregister) {
reactor->WaitForUnregisteredReactable(std::chrono::milliseconds(1000));
}
}
template <typename T>
void Queue<T>::RegisterDequeue(Handler* handler, DequeueCallback callback) {
std::lock_guard<std::mutex> lock(mutex_);
ASSERT(dequeue_.handler_ == nullptr);
ASSERT(dequeue_.reactable_ == nullptr);
dequeue_.handler_ = handler;
dequeue_.reactable_ = dequeue_.handler_->thread_->GetReactor()->Register(
dequeue_.reactive_semaphore_.GetFd(), callback, base::Closure());
}
template <typename T>
void Queue<T>::UnregisterDequeue() {
Reactor* reactor = nullptr;
Reactor::Reactable* to_unregister = nullptr;
bool wait_for_unregister = false;
{
std::lock_guard<std::mutex> lock(mutex_);
ASSERT(dequeue_.reactable_ != nullptr);
reactor = dequeue_.handler_->thread_->GetReactor();
wait_for_unregister = (!dequeue_.handler_->thread_->IsSameThread());
to_unregister = dequeue_.reactable_;
dequeue_.reactable_ = nullptr;
dequeue_.handler_ = nullptr;
}
reactor->Unregister(to_unregister);
if (wait_for_unregister) {
reactor->WaitForUnregisteredReactable(std::chrono::milliseconds(1000));
}
}
template <typename T>
std::unique_ptr<T> Queue<T>::TryDequeue() {
std::lock_guard<std::mutex> lock(mutex_);
if (queue_.empty()) {
return nullptr;
}
dequeue_.reactive_semaphore_.Decrease();
std::unique_ptr<T> data = std::move(queue_.front());
queue_.pop();
enqueue_.reactive_semaphore_.Increase();
return data;
}
template <typename T>
void Queue<T>::EnqueueCallbackInternal(EnqueueCallback callback) {
std::unique_ptr<T> data = callback.Run();
ASSERT(data != nullptr);
std::lock_guard<std::mutex> lock(mutex_);
enqueue_.reactive_semaphore_.Decrease();
queue_.push(std::move(data));
dequeue_.reactive_semaphore_.Increase();
}
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