| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| */ |
| |
| |
| // |
| // Copyright(c) 2018 Gabi Melman. |
| // Distributed under the MIT License (http://opensource.org/licenses/MIT) |
| // |
| |
| #pragma once |
| |
| // periodic worker thread - periodically executes the given callback function. |
| // |
| // RAII over the owned thread: |
| // creates the thread on construction. |
| // stops and joins the thread on destruction (if the thread is executing a callback, wait for it to finish first). |
| |
| #include <chrono> |
| #include <condition_variable> |
| #include <functional> |
| #include <mutex> |
| #include <thread> |
| namespace spdlog { |
| namespace details { |
| |
| class periodic_worker |
| { |
| public: |
| periodic_worker(const std::function<void()> &callback_fun, std::chrono::seconds interval) |
| { |
| active_ = (interval > std::chrono::seconds::zero()); |
| if (!active_) |
| { |
| return; |
| } |
| |
| worker_thread_ = std::thread([this, callback_fun, interval]() { |
| for (;;) |
| { |
| std::unique_lock<std::mutex> lock(this->mutex_); |
| if (this->cv_.wait_for(lock, interval, [this] { return !this->active_; })) |
| { |
| return; // active_ == false, so exit this thread |
| } |
| callback_fun(); |
| } |
| }); |
| } |
| |
| periodic_worker(const periodic_worker &) = delete; |
| periodic_worker &operator=(const periodic_worker &) = delete; |
| |
| // stop the worker thread and join it |
| ~periodic_worker() |
| { |
| if (worker_thread_.joinable()) |
| { |
| { |
| std::lock_guard<std::mutex> lock(mutex_); |
| active_ = false; |
| } |
| cv_.notify_one(); |
| worker_thread_.join(); |
| } |
| } |
| |
| private: |
| bool active_; |
| std::thread worker_thread_; |
| std::mutex mutex_; |
| std::condition_variable cv_; |
| }; |
| } // namespace details |
| } // namespace spdlog |