48 lines
1.5 KiB
C
48 lines
1.5 KiB
C
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/* the Music Player Daemon (MPD)
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* Copyright (C) 2008 Max Kellermann <max@duempel.org>
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* This project's homepage is: 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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#ifndef NOTIFY_H
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#define NOTIFY_H
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/*
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* This library implements inter-process signalling using blocking
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* read() on an anonymous pipe. As a side effect, the read() system
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* call has the same signal interruption behaviour as the old sleep
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* function.
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*
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* As soon as mpd uses threading instead of fork()/shm, we can replace
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* this library with a pthread_cond object.
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*
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* This code is experimental and carries a lot of overhead. Still, it
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* uses less resources than the old polling code with a fixed sleep
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* time.
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*
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*/
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typedef struct _Notify {
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int fds[2];
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} Notify;
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int initNotify(Notify *notify);
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int waitNotify(Notify *notify);
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int signalNotify(Notify *notify);
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#endif
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