88 lines
2.2 KiB
C++
88 lines
2.2 KiB
C++
/*
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* Copyright 2020-2021 The Music Player Daemon Project
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* http://www.musicpd.org
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef MPD_WIN32_COM_WORKER_HXX
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#define MPD_WIN32_COM_WORKER_HXX
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#include "WinEvent.hxx"
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#include "thread/Future.hxx"
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#include "thread/Thread.hxx"
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#include <boost/lockfree/spsc_queue.hpp>
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#include <windows.h>
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// Worker thread for all COM operation
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class COMWorker {
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Thread thread{BIND_THIS_METHOD(Work)};
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boost::lockfree::spsc_queue<std::function<void()>> spsc_buffer{32};
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std::atomic_flag running_flag = true;
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WinEvent event{};
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public:
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COMWorker() {
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thread.Start();
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}
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~COMWorker() noexcept {
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Finish();
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thread.Join();
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}
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COMWorker(const COMWorker &) = delete;
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COMWorker &operator=(const COMWorker &) = delete;
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template<typename Function>
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auto Async(Function &&function) {
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using R = std::invoke_result_t<std::decay_t<Function>>;
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auto promise = std::make_shared<Promise<R>>();
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auto future = promise->get_future();
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Push([function = std::forward<Function>(function),
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promise = std::move(promise)]() mutable {
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try {
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if constexpr (std::is_void_v<R>) {
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std::invoke(std::forward<Function>(function));
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promise->set_value();
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} else {
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promise->set_value(std::invoke(std::forward<Function>(function)));
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}
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} catch (...) {
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promise->set_exception(std::current_exception());
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}
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});
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return future;
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}
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private:
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void Finish() noexcept {
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running_flag.clear();
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event.Set();
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}
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void Push(const std::function<void()> &function) {
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spsc_buffer.push(function);
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event.Set();
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}
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void Work() noexcept;
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};
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#endif
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