1 //******************************************************************************
2 //
3 // File: WorkerTeamThread.java
4 // Package: edu.rit.pj
5 // Unit: Class edu.rit.pj.WorkerTeamThread
6 //
7 // This Java source file is copyright (C) 2010 by Alan Kaminsky. All rights
8 // reserved. For further information, contact the author, Alan Kaminsky, at
9 // ark@cs.rit.edu.
10 //
11 // This Java source file is part of the Parallel Java Library ("PJ"). PJ is free
12 // software; you can redistribute it and/or modify it under the terms of the GNU
13 // General Public License as published by the Free Software Foundation; either
14 // version 3 of the License, or (at your option) any later version.
15 //
16 // PJ is distributed in the hope that it will be useful, but WITHOUT ANY
17 // WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
18 // A PARTICULAR PURPOSE. See the GNU General Public License for more details.
19 //
20 // Linking this library statically or dynamically with other modules is making a
21 // combined work based on this library. Thus, the terms and conditions of the GNU
22 // General Public License cover the whole combination.
23 //
24 // As a special exception, the copyright holders of this library give you
25 // permission to link this library with independent modules to produce an
26 // executable, regardless of the license terms of these independent modules, and
27 // to copy and distribute the resulting executable under terms of your choice,
28 // provided that you also meet, for each linked independent module, the terms
29 // and conditions of the license of that module. An independent module is a module
30 // which is not derived from or based on this library. If you modify this library,
31 // you may extend this exception to your version of the library, but you are not
32 // obligated to do so. If you do not wish to do so, delete this exception
33 // statement from your version.
34 //
35 // A copy of the GNU General Public License is provided in the file gpl.txt. You
36 // may also obtain a copy of the GNU General Public License on the World Wide
37 // Web at http://www.gnu.org/licenses/gpl.html.
38 //
39 //******************************************************************************
40 package edu.rit.pj;
41
42 import java.util.concurrent.Semaphore;
43
44 /**
45 * Class WorkerTeamThread provides one thread in a {@linkplain WorkerTeam} of
46 * threads for executing a {@linkplain WorkerRegion} in parallel.
47 *
48 * @author Alan Kaminsky
49 * @version 19-Jan-2010
50 */
51 class WorkerTeamThread
52 extends Thread {
53
54 // Hidden data members.
55 // Reference to the worker team.
56 WorkerTeam myTeam;
57
58 // Index of this thread within the worker team.
59 int myIndex;
60
61 // Semaphore for synchronizing threads at the beginning of a worker region.
62 Semaphore myRegionBeginSemaphore = new Semaphore(0);
63
64 // 128 bytes of extra padding to avert cache interference.
65 private long p0, p1, p2, p3, p4, p5, p6, p7;
66 private long p8, p9, pa, pb, pc, pd, pe, pf;
67
68 // Exported constructors.
69 /**
70 * Construct a new worker team thread.
71 *
72 * @param theTeam Worker team to which this thread belongs.
73 * @param theIndex Index of this thread within the team.
74 */
75 public WorkerTeamThread(WorkerTeam theTeam,
76 int theIndex) {
77 myTeam = theTeam;
78 myIndex = theIndex;
79 setDaemon(true);
80 start();
81 }
82
83 // Exported operations.
84 /**
85 * Run this worker team thread.
86 */
87 public void run() {
88 for (;;) {
89 // Wait until released by the main thread.
90 myRegionBeginSemaphore.acquireUninterruptibly();
91
92 // Call the worker region's run() method. Save any
93 // exception for later.
94 try {
95 myTeam.myRegion.run();
96 } catch (Throwable exc) {
97 synchronized (System.err) {
98 System.err.println("Worker team thread " + myIndex
99 + ": WorkerRegion.run() threw an exception");
100 exc.printStackTrace(System.err);
101 }
102 myTeam.myExceptionMap.put(myIndex, exc);
103 }
104
105 // Tell the main thread we're done.
106 myTeam.myRegionEndSemaphore.release();
107 }
108 }
109
110 }