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/*
 * Copyright (c) 1998-2018 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source 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.
 *
 * Resin Open Source 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, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *   Free SoftwareFoundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package com.caucho.util;

/**
 * Waits for n threads.
 */
public class CyclicBarrier {
  private int _parties;
  private int _waiting;

  public CyclicBarrier(int parties)
  {
    _parties = parties;
  }
  
  /**
   * Allocates the semaphore, returns true on success.
   */
  public int await()
    throws InterruptedException
  {
    synchronized (this) {
      if (++_waiting == _parties) {
        _waiting = 0;
        notifyAll();
      }
      else {
        wait(600 * 1000);
      }
    }

    return _parties;
  }
}