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