1/* 2 * Copyright 2019 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17template <typename T> 18Queue<T>::Queue(size_t capacity) : enqueue_(capacity), dequeue_(0){}; 19 20template <typename T> 21Queue<T>::~Queue() { 22 ASSERT(enqueue_.handler_ == nullptr); 23 ASSERT(dequeue_.handler_ == nullptr); 24}; 25 26template <typename T> 27void Queue<T>::RegisterEnqueue(Handler* handler, EnqueueCallback callback) { 28 std::lock_guard<std::mutex> lock(mutex_); 29 ASSERT(enqueue_.handler_ == nullptr); 30 ASSERT(enqueue_.reactable_ == nullptr); 31 enqueue_.handler_ = handler; 32 enqueue_.reactable_ = enqueue_.handler_->thread_->GetReactor()->Register( 33 enqueue_.reactive_semaphore_.GetFd(), 34 base::Bind(&Queue<T>::EnqueueCallbackInternal, base::Unretained(this), std::move(callback)), 35 base::Closure()); 36} 37 38template <typename T> 39void Queue<T>::UnregisterEnqueue() { 40 std::lock_guard<std::mutex> lock(mutex_); 41 ASSERT(enqueue_.reactable_ != nullptr); 42 enqueue_.handler_->thread_->GetReactor()->Unregister(enqueue_.reactable_); 43 enqueue_.reactable_ = nullptr; 44 enqueue_.handler_ = nullptr; 45} 46 47template <typename T> 48void Queue<T>::RegisterDequeue(Handler* handler, DequeueCallback callback) { 49 std::lock_guard<std::mutex> lock(mutex_); 50 ASSERT(dequeue_.handler_ == nullptr); 51 ASSERT(dequeue_.reactable_ == nullptr); 52 dequeue_.handler_ = handler; 53 dequeue_.reactable_ = dequeue_.handler_->thread_->GetReactor()->Register(dequeue_.reactive_semaphore_.GetFd(), 54 callback, base::Closure()); 55} 56 57template <typename T> 58void Queue<T>::UnregisterDequeue() { 59 std::lock_guard<std::mutex> lock(mutex_); 60 ASSERT(dequeue_.reactable_ != nullptr); 61 dequeue_.handler_->thread_->GetReactor()->Unregister(dequeue_.reactable_); 62 dequeue_.reactable_ = nullptr; 63 dequeue_.handler_ = nullptr; 64} 65 66template <typename T> 67std::unique_ptr<T> Queue<T>::TryDequeue() { 68 std::lock_guard<std::mutex> lock(mutex_); 69 70 if (queue_.empty()) { 71 return nullptr; 72 } 73 74 dequeue_.reactive_semaphore_.Decrease(); 75 76 std::unique_ptr<T> data = std::move(queue_.front()); 77 queue_.pop(); 78 79 enqueue_.reactive_semaphore_.Increase(); 80 81 return data; 82} 83 84template <typename T> 85void Queue<T>::EnqueueCallbackInternal(EnqueueCallback callback) { 86 std::unique_ptr<T> data = callback.Run(); 87 ASSERT(data != nullptr); 88 std::lock_guard<std::mutex> lock(mutex_); 89 enqueue_.reactive_semaphore_.Decrease(); 90 queue_.push(std::move(data)); 91 dequeue_.reactive_semaphore_.Increase(); 92} 93