Mercurial > hg > graal-jvmci-8
view agent/src/share/classes/sun/jvm/hotspot/runtime/PerfMemory.java @ 702:b9fba36710f2
6699669: Hotspot server leaves synchronized block with monitor in bad state
Summary: Remove usage of _highest_lock field in Thread so that is_lock_owned won't depend on the correct update of that field.
Reviewed-by: never, dice, acorn
author | xlu |
---|---|
date | Mon, 06 Apr 2009 15:47:39 -0700 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
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/* * Copyright 2004 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ package sun.jvm.hotspot.runtime; import java.util.*; import sun.jvm.hotspot.debugger.*; import sun.jvm.hotspot.oops.*; import sun.jvm.hotspot.types.*; public class PerfMemory { private static AddressField startField; private static AddressField endField; private static AddressField topField; private static CIntegerField capacityField; private static AddressField prologueField; private static JIntField initializedField; static { VM.registerVMInitializedObserver(new Observer() { public void update(Observable o, Object data) { initialize(VM.getVM().getTypeDataBase()); } }); } private static synchronized void initialize(TypeDataBase db) { Type type = db.lookupType("PerfMemory"); startField = type.getAddressField("_start"); endField = type.getAddressField("_end"); topField = type.getAddressField("_top"); capacityField = type.getCIntegerField("_capacity"); prologueField = type.getAddressField("_prologue"); initializedField = type.getJIntField("_initialized"); } // Accessors public static Address start() { return startField.getValue(); } public static Address end() { return endField.getValue(); } public static Address top() { return topField.getValue(); } public static long capacity() { return capacityField.getValue(); } public static boolean initialized() { return ((int) initializedField.getValue()) != 0; } public static PerfDataPrologue prologue() { return (PerfDataPrologue) VMObjectFactory.newObject( PerfDataPrologue.class, prologueField.getValue()); } public static boolean contains(Address addr) { return start() != null && addr.minus(start()) >= 0 && end().minus(addr) > 0; } // an interface supplied to iterate PerfDataEntries public static interface PerfDataEntryVisitor { // returns false to stop the iteration public boolean visit(PerfDataEntry pde); } public static void iterate(PerfDataEntryVisitor visitor) { PerfDataPrologue header = prologue(); int off = header.entryOffset(); int num = header.numEntries(); Address addr = header.getAddress(); for (int i = 0; i < num; i++) { PerfDataEntry pde = (PerfDataEntry) VMObjectFactory.newObject( PerfDataEntry.class, addr.addOffsetTo(off)); off += pde.entryLength(); if (visitor.visit(pde) == false) return; } } }