code: // from gee.cs.oswego.edu/home/jsr166/jsr166
  
  package jsr166tests.jtreg.util.concurrent.DelayQueue;
  
  /*
   * Copyright 2008 Sun Microsystems, Inc.  All Rights Reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
   *
   * This code 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
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
   * CA 95054 USA or visit www.sun.com if you need additional information or
   * have any questions.
   */
  
  import java.util.concurrent.*;
  import static java.util.concurrent.TimeUnit.*;
  
  /**
   * This is not a regression test, but a stress benchmark test for
   * 6609775: Reduce context switches in DelayQueue due to signalAll
   *
   * This runs in the same wall clock time, but much reduced cpu time,
   * with the changes for 6609775.
   */
  public class Stress {
  
      public static void main(String[] args) throws Throwable {
  
          final DelayQueue<Delayed> q = new DelayQueue<Delayed>();
          final long t0 = System.nanoTime();
          for (long i = 0; i < 1000; i++) {
              final long expiry = t0 + i*10L*1000L*1000L;
              q.add(new Delayed() {
                      public long getDelay(TimeUnit unit) {
                          return unit.convert(expiry - System.nanoTime(),
                                              NANOSECONDS);
                      }
                      public int compareTo(Delayed x) {
                          long d = getDelay(NANOSECONDS)
                              - x.getDelay(NANOSECONDS);
                          return d < 0 ? -1 : d > 0 ? 1 : 0; }});
          }
  
          for (int i = 0; i < 300; i++)
              new Thread() { public void run() {
                  try {
                      while (!q.isEmpty())
                          q.poll(10L, TimeUnit.SECONDS);
                  } catch (Throwable t) { t.printStackTrace(); }
              }}.start();
      }
  }
  