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63 lines
2.4 KiB
Java
63 lines
2.4 KiB
Java
/*
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[The "BSD licence"]
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Copyright (c) 2005-2008 Terence Parr
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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1. Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products
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derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.antlr.misc;
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/**A very simple barrier wait. Once a thread has requested a
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* wait on the barrier with waitForRelease, it cannot fool the
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* barrier into releasing by "hitting" the barrier multiple times--
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* the thread is blocked on the wait().
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*/
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public class Barrier {
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protected int threshold;
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protected int count = 0;
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public Barrier(int t) {
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threshold = t;
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}
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public synchronized void waitForRelease()
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throws InterruptedException
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{
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count++;
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// The final thread to reach barrier resets barrier and
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// releases all threads
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if ( count==threshold ) {
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// notify blocked threads that threshold has been reached
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action(); // perform the requested operation
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notifyAll();
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}
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else while ( count<threshold ) {
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wait();
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}
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}
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/** What to do when everyone reaches barrier */
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public void action() {
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}
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}
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