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/*
* Copyright 2003-2017 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef MPD_DEFER_EVENT_HXX
#define MPD_DEFER_EVENT_HXX
#include "check.h"
#include "util/BindMethod.hxx"
#include <boost/intrusive/list_hook.hpp>
class EventLoop;
/**
* Invoke a method call in the #EventLoop.
*
* This class is thread-safe.
*/
class DeferEvent final {
friend class EventLoop;
typedef boost::intrusive::list_member_hook<> ListHook;
ListHook list_hook;
EventLoop &loop;
typedef BoundMethod<void() noexcept> Callback;
const Callback callback;
public:
DeferEvent(EventLoop &_loop, Callback _callback) noexcept
:loop(_loop), callback(_callback) {}
~DeferEvent() noexcept {
Cancel();
}
EventLoop &GetEventLoop() noexcept {
return loop;
}
void Schedule() noexcept;
void Cancel() noexcept;
private:
bool IsPending() const noexcept {
return list_hook.is_linked();
}
void RunDeferred() noexcept {
callback();
}
};
#endif
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