1 /* 2 * Copyright (c) 2014, 2015, Dynatrace and/or its affiliates. All rights reserved. 3 * 4 * This file is part of the Lock Contention Tracing Subsystem for the HotSpot 5 * Virtual Machine, which is developed at Christian Doppler Laboratory on 6 * Monitoring and Evolution of Very-Large-Scale Software Systems. Please 7 * contact us at <http://mevss.jku.at/> if you need additional information 8 * or have any questions. 9 * 10 * This code is free software; you can redistribute it and/or modify it 11 * under the terms of the GNU General Public License version 2 only, as 12 * published by the Free Software Foundation. 13 * 14 * This code is distributed in the hope that it will be useful, but WITHOUT 15 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 16 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 17 * version 2 for more details (a copy is included in the LICENSE file that 18 * accompanied this code). 19 * 20 * You should have received a copy of the GNU General Public License version 21 * 2 along with this work. If not, see <http://www.gnu.org/licenses/>. 22 * 23 */ 24 package sun.evtracing.processing.statistics; 25 26 import sun.evtracing.parser.metadata.JavaStack; 27 import sun.evtracing.parser.metadata.JavaStackFrame; 28 import sun.evtracing.parser.metadata.JavaThread; 29 import sun.evtracing.processing.Sanity; 30 import sun.evtracing.processing.statistics.aggregator.ContentionProcessor; 31 import sun.evtracing.processing.statistics.metadata.ParkEventTuple; 32 33 public class ParkBlockerReentrantReadWriteLockAnalyser extends ParkBlockerAbstractQueuedSynchronizerAnalyser { 34 public ParkBlockerReentrantReadWriteLockAnalyser(ContentionProcessor cproc) { 35 super(cproc); 36 } 37 38 @Override 39 boolean isShared(ParkEventTuple cur) { 40 for (JavaStackFrame f : cur.unpark().stack().metadata()) { 41 switch (f.method().clazz().name()) { 42 case "java/util/concurrent/locks/ReentrantReadWriteLock$ReadLock": 43 return true; 44 case "java/util/concurrent/locks/ReentrantReadWriteLock$WriteLock": 45 return false; 46 } 47 } 48 Sanity.warn("unknown lock type, maybe spurious wakeup"); 49 return false; 50 } 51 52 @Override 53 JavaThread sharedThread() { 54 return JavaThread.READERS; 55 } 56 57 @Override 58 JavaStack sharedSite() { 59 return JavaStack.READERS; 60 } 61 }