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+/* the Music Player Daemon (MPD)
+ * Copyright (C) 2008 Max Kellermann <max@duempel.org>
+ * This project's homepage is: 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef NOTIFY_H
+#define NOTIFY_H
+
+/*
+ * This library implements inter-process signalling using blocking
+ * read() on an anonymous pipe.  As a side effect, the read() system
+ * call has the same signal interruption behaviour as the old sleep
+ * function.
+ *
+ * As soon as mpd uses threading instead of fork()/shm, we can replace
+ * this library with a pthread_cond object.
+ *
+ * This code is experimental and carries a lot of overhead.  Still, it
+ * uses less resources than the old polling code with a fixed sleep
+ * time.
+ *
+ */
+
+typedef struct _Notify {
+	int fds[2];
+} Notify;
+
+int initNotify(Notify *notify);
+
+int waitNotify(Notify *notify);
+
+int signalNotify(Notify *notify);
+
+#endif