1 /* 2 * Copyright (C) 2025 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 #pragma once 17 18 #include <mutex> 19 #include <queue> 20 21 namespace android { 22 namespace os { 23 namespace statsd { 24 25 template <typename T> 26 class ThreadSafeQueue { 27 public: pop()28 std::optional<T> pop() { 29 std::unique_lock<std::mutex> lock(mMutex); 30 if (mQueue.empty()) { 31 return std::nullopt; 32 } 33 T value = std::move(mQueue.front()); 34 mQueue.pop(); 35 return value; 36 } 37 push(const T value)38 void push(const T value) { 39 std::unique_lock<std::mutex> lock(mMutex); 40 mQueue.push(value); 41 } 42 empty()43 bool empty() const { 44 std::unique_lock<std::mutex> lock(mMutex); 45 return mQueue.empty(); 46 } 47 48 private: 49 mutable std::mutex mMutex; 50 std::queue<T> mQueue; 51 }; 52 53 } // namespace statsd 54 } // namespace os 55 } // namespace android 56