70 lines
1.6 KiB
C++
70 lines
1.6 KiB
C++
|
/*
|
||
|
|
* Copyright (C) 2003-2013 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_PIPE_HXX
|
||
|
|
#define MPD_EVENT_PIPE_HXX
|
||
|
|
|
||
|
|
#include "check.h"
|
||
|
|
|
||
|
|
#include <assert.h>
|
||
|
|
|
||
|
|
/**
|
||
|
|
* A pipe that can be used to trigger an event to the read side.
|
||
|
|
*
|
||
|
|
* For optimization purposes, this class does not have a constructor
|
||
|
|
* or a destructor.
|
||
|
|
*/
|
||
|
|
class EventPipe {
|
||
|
|
int fds[2];
|
||
|
|
|
||
|
|
public:
|
||
|
|
#ifdef NDEBUG
|
||
|
|
EventPipe() = default;
|
||
|
|
#else
|
||
|
|
EventPipe():fds{-1, -1} {};
|
||
|
|
#endif
|
||
|
|
|
||
|
|
EventPipe(const EventPipe &other) = delete;
|
||
|
|
EventPipe &operator=(const EventPipe &other) = delete;
|
||
|
|
|
||
|
|
bool Create();
|
||
|
|
void Destroy();
|
||
|
|
|
||
|
|
int Get() const {
|
||
|
|
assert(fds[0] >= 0);
|
||
|
|
assert(fds[1] >= 0);
|
||
|
|
|
||
|
|
return fds[0];
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* 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 /* MAIN_NOTIFY_H */
|