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/*
* Copyright (C) 2003-2015 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_EVENT_FD_HXX
#define MPD_EVENT_FD_HXX
#include "check.h"
#include "FileDescriptor.hxx"
/**
* A class that wraps eventfd().
*
* Errors in the constructor are fatal.
*/
class EventFD {
FileDescriptor fd;
public:
EventFD();
~EventFD() {
fd.Close();
}
EventFD(const EventFD &other) = delete;
EventFD &operator=(const EventFD &other) = delete;
int Get() const {
return fd.Get();
}
/**
* Checks if Write() was called at least once since the last
* Read() call.
*/
bool Read();
/**
* Wakes up the reader. Multiple calls to this function will
* be combined to one wakeup.
*/
void Write();
};
#endif
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