/*
 * File    : Semaphore.java
 * Created : 24-Mar-2004
 * By      : parg
 * 
 * Azureus - a Java Bittorrent client
 *
 * 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.
 *
 * 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 ( see the LICENSE file ).
 *
 * 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
 */

package org.gudy.azureus2.plugins.utils;

/**
 * @author parg
 *
 */
public interface 
Semaphore 
{
	public void
	reserve();
	
	public boolean
	reserveIfAvailable();
	
		/**
		 * reserve a semaphore subject to timeout 
		 * @param timeout_millis	time to wait
		 * @return true -> semaphore reserved, false -> timeout exceeded
		 */
	
	public boolean
	reserve(
		long	timeout_millis );
	
	public void
	release();
	
	public void
	releaseAllWaiters();
	
}