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