code: // from gee.cs.oswego.edu/home/jsr166/jsr166
  
  package jsr166tests.jtreg.util.concurrent.ScheduledThreadPoolExecutor;
  
  /*
   * 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.*;
  
  /**
   * This is not a regression test, but a stress benchmark test for
   * 6602600: Fast removal of cancelled scheduled thread pool tasks
   *
   * This runs in the same wall clock time, but much reduced cpu time,
   * with the changes for 6602600.
   */
  public class Stress {
  
      public static void main(String[] args) throws Throwable {
  
          final CountDownLatch count = new CountDownLatch(1000);
  
          final ScheduledThreadPoolExecutor pool =
              new ScheduledThreadPoolExecutor(100);
          pool.prestartAllCoreThreads();
  
          final Runnable incTask = new Runnable() { public void run() {
              count.countDown();
          }};
  
          pool.scheduleAtFixedRate(incTask, 0, 10, TimeUnit.MILLISECONDS);
  
          count.await();
  
          pool.shutdown();
          pool.awaitTermination(1L, TimeUnit.DAYS);
      }
  }
  