spdlog periodic_worker workaround for MSVC

periodic_worker-inl.h

// Copyright(c) 2015-present, Gabi Melman & spdlog contributors.
// Distributed under the MIT License (http://opensource.org/licenses/MIT)

#pragma once

#ifndef SPDLOG_HEADER_ONLY
#include "spdlog/details/periodic_worker.h"
#endif

namespace spdlog {
namespace details {

SPDLOG_INLINE periodic_worker::periodic_worker(const std::function<void()> &callback_fun, std::chrono::seconds interval)
{
#ifdef _WIN32
    ::InitializeCriticalSection(&cs_);
    ::InitializeConditionVariable(&cv_);
#endif

    active_ = (interval > std::chrono::seconds::zero());
    if (!active_)
    {
        return;
    }

    worker_thread_ = std::thread([this, callback_fun, interval]() {
        for (;;)
        {
#ifdef _WIN32
            ::EnterCriticalSection(&cs_);
            if (!active_)
            {
                ::LeaveCriticalSection(&cs_);
                return;
            }
            else
            {
                SleepConditionVariableCS(&cv_, &cs_, static_cast<DWORD>(interval.count()) * 1000);
                if (!active_)
                {
                    ::LeaveCriticalSection(&cs_);
                    return;
                }
                // TODO if not timed-out, sleep more
            }
            callback_fun();
            ::LeaveCriticalSection(&cs_);
#else
            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();
#endif
        }
    });
}

// stop the worker thread and join it
SPDLOG_INLINE periodic_worker::~periodic_worker()
{
    if (worker_thread_.joinable())
    {
#ifdef _WIN32
        {
            ::EnterCriticalSection(&cs_);
            active_ = false;
            ::LeaveCriticalSection(&cs_);
        }
        WakeConditionVariable(&cv_);
#else
        {
            std::lock_guard<std::mutex> lock(mutex_);
            active_ = false;
        }
        cv_.notify_one();
#endif
        worker_thread_.join();
    }

#ifdef _WIN32
    ::DeleteCriticalSection(&cs_);
#endif
}

} // namespace details
} // namespace spdlog

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 periodic_worker
{
public:
    periodic_worker(const std::function<void()> &callback_fun, std::chrono::seconds interval);
    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_;

#ifdef _WIN32
    CRITICAL_SECTION cs_;
    CONDITION_VARIABLE cv_;
#else
    std::mutex mutex_;
    std::condition_variable cv_;
#endif
};

} // namespace details
} // namespace spdlog

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