//******************************************************************************
   //
   // File:    WorkerTeamThread.java
   // Package: edu.rit.pj
   // Unit:    Class edu.rit.pj.WorkerTeamThread
   //
   // This Java source file is copyright (C) 2010 by Alan Kaminsky. All rights
   // reserved. For further information, contact the author, Alan Kaminsky, at
   // ark@cs.rit.edu.
  //
  // This Java source file is part of the Parallel Java Library ("PJ"). PJ 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 3 of the License, or (at your option) any later version.
  //
  // PJ 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 for more details.
  //
  // Linking this library statically or dynamically with other modules is making a
  // combined work based on this library. Thus, the terms and conditions of the GNU
  // General Public License cover the whole combination.
  //
  // As a special exception, the copyright holders of this library give you
  // permission to link this library with independent modules to produce an
  // executable, regardless of the license terms of these independent modules, and
  // to copy and distribute the resulting executable under terms of your choice,
  // provided that you also meet, for each linked independent module, the terms
  // and conditions of the license of that module. An independent module is a module
  // which is not derived from or based on this library. If you modify this library,
  // you may extend this exception to your version of the library, but you are not
  // obligated to do so. If you do not wish to do so, delete this exception
  // statement from your version.
  //
  // A copy of the GNU General Public License is provided in the file gpl.txt. You
  // may also obtain a copy of the GNU General Public License on the World Wide
  // Web at http://www.gnu.org/licenses/gpl.html.
  //
  //******************************************************************************
  package edu.rit.pj;
  
  import java.util.concurrent.Semaphore;
  
  /**
   * Class WorkerTeamThread provides one thread in a {@linkplain WorkerTeam} of
   * threads for executing a {@linkplain WorkerRegion} in parallel.
   *
   * @author Alan Kaminsky
   * @version 19-Jan-2010
   */
  class WorkerTeamThread
          extends Thread {
  
  // Hidden data members.
      // Reference to the worker team.
      WorkerTeam myTeam;
  
      // Index of this thread within the worker team.
      int myIndex;
  
      // Semaphore for synchronizing threads at the beginning of a worker region.
      Semaphore myRegionBeginSemaphore = new Semaphore(0);
  
      // 128 bytes of extra padding to avert cache interference.
      private long p0, p1, p2, p3, p4, p5, p6, p7;
      private long p8, p9, pa, pb, pc, pd, pe, pf;
  
  // Exported constructors.
      /**
       * Construct a new worker team thread.
       *
       * @param theTeam Worker team to which this thread belongs.
       * @param theIndex Index of this thread within the team.
       */
      public WorkerTeamThread(WorkerTeam theTeam,
              int theIndex) {
          myTeam = theTeam;
          myIndex = theIndex;
          setDaemon(true);
          start();
      }
  
  // Exported operations.
      /**
       * Run this worker team thread.
       */
      public void run() {
          for (;;) {
              // Wait until released by the main thread.
              myRegionBeginSemaphore.acquireUninterruptibly();
  
              // Call the worker region's run() method. Save any
              // exception for later.
              try {
                  myTeam.myRegion.run();
              } catch (Throwable exc) {
                  synchronized (System.err) {
                      System.err.println("Worker team thread " + myIndex
                              + ": WorkerRegion.run() threw an exception");
                     exc.printStackTrace(System.err);
                 }
                 myTeam.myExceptionMap.put(myIndex, exc);
             }
 
             // Tell the main thread we're done.
             myTeam.myRegionEndSemaphore.release();
         }
     }
 
 }