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comparison agent/src/share/classes/sun/jvm/hotspot/runtime/ConcurrentLocksPrinter.java @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children c18cbe5936b8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 2005 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 package sun.jvm.hotspot.runtime;
26
27 import java.io.*;
28 import java.util.*;
29 import sun.jvm.hotspot.memory.*;
30 import sun.jvm.hotspot.oops.*;
31
32 public class ConcurrentLocksPrinter {
33 private Map locksMap = new HashMap(); // <JavaThread, List<Oop>>
34
35 public ConcurrentLocksPrinter() {
36 fillLocks();
37 }
38
39 public void print(JavaThread jthread, PrintStream tty) {
40 List locks = (List) locksMap.get(jthread);
41 tty.println("Locked ownable synchronizers:");
42 if (locks == null || locks.isEmpty()) {
43 tty.println(" - None");
44 } else {
45 for (Iterator itr = locks.iterator(); itr.hasNext();) {
46 Oop oop = (Oop) itr.next();
47 tty.println(" - <" + oop.getHandle() + ">, (a " +
48 oop.getKlass().getName().asString() + ")");
49 }
50 }
51 }
52
53 //-- Internals only below this point
54 private JavaThread getOwnerThread(Oop oop) {
55 Oop threadOop = OopUtilities.abstractOwnableSynchronizerGetOwnerThread(oop);
56 if (threadOop == null) {
57 return null;
58 } else {
59 return OopUtilities.threadOopGetJavaThread(threadOop);
60 }
61 }
62
63 private void fillLocks() {
64 VM vm = VM.getVM();
65 SystemDictionary sysDict = vm.getSystemDictionary();
66 Klass absOwnSyncKlass = sysDict.getAbstractOwnableSynchronizerKlass();
67 ObjectHeap heap = vm.getObjectHeap();
68 // may be not loaded at all
69 if (absOwnSyncKlass != null) {
70 heap.iterateObjectsOfKlass(new DefaultHeapVisitor() {
71 public boolean doObj(Oop oop) {
72 JavaThread thread = getOwnerThread(oop);
73 if (thread != null) {
74 List locks = (List) locksMap.get(thread);
75 if (locks == null) {
76 locks = new LinkedList();
77 locksMap.put(thread, locks);
78 }
79 locks.add(oop);
80 }
81 return false;
82 }
83
84 }, absOwnSyncKlass, true);
85 }
86 }
87 }