// A simple barrier.
// (c) 1997 duane a. bailey.
package element;

/**
 * Copyright (c) 1997 McGraw-Hill
 * All Rights Reserved.
 * <p>
 * Permission to use, copy, modify, and distribute this
 * software and its documentation for NON-COMMERCIAL purposes
 * and without fee is hereby granted provided that this
 * copyright notice appears in all copies. Please refer to
 * the file <a href="http://www.cs.williams.edu">"copyright.html"</a> for further important copyright
 * and licensing information.
 * <p>
 * MCGRAW-HILL MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE
 * SUITABILITY OF THE SOFTWARE, EITHER EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, OR
 * NON-INFRINGEMENT. MCGRAW-HILL SHALL NOT BE LIABLE FOR ANY DAMAGES
 * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES.
 * @version $Id: Barrier.java,v 2.1 1999/07/11 02:52:16 bailey Exp $
 * @author duane a. bailey
 */
class Barrier
{
    /**
     */
    public Barrier()
    {
    }

    synchronized public void P()
    // post: awaits allocation of a resource
    {
	try {
   	    wait();
	} catch (java.lang.InterruptedException e) {};
    }

    synchronized public void V()
    // post: frees resource
    {
	notifyAll();
    }
}