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//******************************************************************************
//
// 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 edu.rit.io.Stdio;
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();
}
}
}
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