0N/A/*
2362N/A * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
0N/A * published by the Free Software Foundation.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0N/A *
2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
2362N/A * or visit www.oracle.com if you need additional information or have any
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0N/A */
0N/A
0N/A/*
0N/A * @bug 4530538
0N/A * @summary A Barrier utility class.
0N/A * @author Mandy Chung
0N/A */
0N/A
0N/Apublic class Barrier {
0N/A private Object go = new Object();
0N/A private int count;
0N/A private int waiters = 0;
0N/A
0N/A public Barrier(int count) {
0N/A if (count <= 0) {
0N/A throw new IllegalArgumentException();
0N/A }
0N/A this.count = count;
0N/A }
0N/A
0N/A public void set(int count) {
0N/A if (waiters != 0) {
0N/A throw new IllegalArgumentException();
0N/A }
0N/A this.count = count;
0N/A this.waiters = 0;
0N/A }
0N/A
0N/A public void await() {
0N/A synchronized (go) {
0N/A waiters++;
0N/A while (count > 0) {
0N/A try {
0N/A go.wait();
0N/A } catch (InterruptedException e) {
0N/A e.printStackTrace();
0N/A throw new InternalError();
0N/A }
0N/A }
0N/A waiters--;
0N/A }
0N/A }
0N/A public void signal() {
0N/A synchronized (go) {
0N/A count--;
0N/A go.notifyAll();
0N/A }
0N/A }
0N/A
0N/A public int getWaiterCount() {
0N/A synchronized (go) {
0N/A return waiters;
0N/A }
0N/A }
0N/A}