THUAI6/CAPI/cpp/spdlog/include/spdlog/details/periodic_worker.h

// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
// 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 SPDLOG_API periodic_worker
        {
        public:
            template<typename Rep, typename Period>
            periodic_worker(const std::function<void()>& callback_fun, std::chrono::duration<Rep, Period> interval)
            {
                active_ = (interval > std::chrono::duration<Rep, Period>::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();

        private:
            bool active_;
            std::thread worker_thread_;
            std::mutex mutex_;
            std::condition_variable cv_;
        };
    }  // namespace details
}  // namespace spdlog

#ifdef SPDLOG_HEADER_ONLY
#include "periodic_worker-inl.h"
#endif