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notify.hxx 1.25 KB
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/*
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 * Copyright 2003-2017 The Music Player Daemon Project
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 * http://www.musicpd.org
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 *
 * 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.
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 *
 * 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.
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 */

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#ifndef MPD_NOTIFY_HXX
#define MPD_NOTIFY_HXX
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#include "thread/Mutex.hxx"
#include "thread/Cond.hxx"
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struct notify {
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	Mutex mutex;
	Cond cond;
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	bool pending = false;
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	/**
	 * Wait for a notification.  Return immediately if we have already
	 * been notified since we last returned from notify_wait().
	 */
	void Wait();

	/**
	 * Notify the thread.  This function never blocks.
	 */
	void Signal();

	/**
	 * Clears a pending notification.
	 */
	void Clear();
};
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#endif