| /* |
| * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| package sun.jvm.hotspot.runtime; |
| |
| import java.io.*; |
| import java.util.*; |
| import sun.jvm.hotspot.memory.*; |
| import sun.jvm.hotspot.oops.*; |
| |
| public class ConcurrentLocksPrinter { |
| private Map locksMap = new HashMap(); // <JavaThread, List<Oop>> |
| |
| public ConcurrentLocksPrinter() { |
| fillLocks(); |
| } |
| |
| public void print(JavaThread jthread, PrintStream tty) { |
| List locks = (List) locksMap.get(jthread); |
| tty.println("Locked ownable synchronizers:"); |
| if (locks == null || locks.isEmpty()) { |
| tty.println(" - None"); |
| } else { |
| for (Iterator itr = locks.iterator(); itr.hasNext();) { |
| Oop oop = (Oop) itr.next(); |
| tty.println(" - <" + oop.getHandle() + ">, (a " + |
| oop.getKlass().getName().asString() + ")"); |
| } |
| } |
| } |
| |
| //-- Internals only below this point |
| private JavaThread getOwnerThread(Oop oop) { |
| Oop threadOop = OopUtilities.abstractOwnableSynchronizerGetOwnerThread(oop); |
| if (threadOop == null) { |
| return null; |
| } else { |
| return OopUtilities.threadOopGetJavaThread(threadOop); |
| } |
| } |
| |
| private void fillLocks() { |
| VM vm = VM.getVM(); |
| SystemDictionary sysDict = vm.getSystemDictionary(); |
| Klass absOwnSyncKlass = sysDict.getAbstractOwnableSynchronizerKlass(); |
| ObjectHeap heap = vm.getObjectHeap(); |
| // may be not loaded at all |
| if (absOwnSyncKlass != null) { |
| heap.iterateObjectsOfKlass(new DefaultHeapVisitor() { |
| public boolean doObj(Oop oop) { |
| JavaThread thread = getOwnerThread(oop); |
| if (thread != null) { |
| List locks = (List) locksMap.get(thread); |
| if (locks == null) { |
| locks = new LinkedList(); |
| locksMap.put(thread, locks); |
| } |
| locks.add(oop); |
| } |
| return false; |
| } |
| |
| }, absOwnSyncKlass, true); |
| } |
| } |
| } |