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/*
* Copyright 2003-2018 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_SOCKET_IDLE_MONITOR_HXX
#define MPD_SOCKET_IDLE_MONITOR_HXX
#include <boost/intrusive/list_hook.hpp>
class EventLoop;
/**
* An event that runs when the EventLoop has become idle, before
* waiting for more events.
*
* This class is not thread-safe, all methods must be called from the
* thread that runs the #EventLoop, except where explicitly documented
* as thread-safe.
*/
class IdleMonitor {
friend class EventLoop;
typedef boost::intrusive::list_member_hook<> ListHook;
ListHook list_hook;
EventLoop &loop;
public:
explicit IdleMonitor(EventLoop &_loop) noexcept
:loop(_loop) {}
~IdleMonitor() noexcept {
#ifndef NDEBUG
/* this check is redundant, it is only here to avoid
the assertion in Cancel() */
if (IsActive())
#endif
Cancel();
}
EventLoop &GetEventLoop() const noexcept {
return loop;
}
bool IsActive() const noexcept {
return list_hook.is_linked();
}
void Schedule() noexcept;
void Cancel() noexcept;
protected:
virtual void OnIdle() noexcept = 0;
private:
void Run() noexcept;
};
#endif
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