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annotate agent/src/share/classes/sun/jvm/hotspot/runtime/DeadlockDetector.java @ 12226:7944aba7ba41
8015107: NPG: Use consistent naming for metaspace concepts
Reviewed-by: coleenp, mgerdin, hseigel
| author | ehelin |
|---|---|
| date | Mon, 12 Aug 2013 17:37:02 +0200 |
| parents | c18cbe5936b8 |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
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2 * Copyright (c) 2004, 2006, Oracle and/or its affiliates. All rights reserved. |
| 0 | 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 25 package sun.jvm.hotspot.runtime; | |
| 26 | |
| 27 import sun.jvm.hotspot.debugger.*; | |
| 28 import sun.jvm.hotspot.memory.*; | |
| 29 import sun.jvm.hotspot.oops.*; | |
| 30 import java.io.*; | |
| 31 import java.util.*; | |
| 32 import java.util.Map.Entry; | |
| 33 | |
| 34 /** Prints information about Java-level deadlocks in supplied 'tty'. */ | |
| 35 | |
| 36 public class DeadlockDetector { | |
| 37 | |
| 38 public static void print(PrintStream tty) { | |
| 39 print(tty, true); | |
| 40 } | |
| 41 | |
| 42 /** prints zero or more deadlocks into 'tty' taking current | |
| 43 snapshot of Java threads and locks */ | |
| 44 public static void print(PrintStream tty, boolean concurrentLocks) { | |
| 45 tty.println("Deadlock Detection:"); | |
| 46 tty.println(); | |
| 47 | |
| 48 int globalDfn = 0, thisDfn; | |
| 49 int numberOfDeadlocks = 0; | |
| 50 JavaThread currentThread = null, previousThread = null; | |
| 51 ObjectMonitor waitingToLockMonitor = null; | |
| 52 Oop waitingToLockBlocker = null; | |
| 53 | |
| 54 threads = VM.getVM().getThreads(); | |
| 55 heap = VM.getVM().getObjectHeap(); | |
| 56 createThreadTable(); | |
| 57 | |
| 58 Iterator i = threadTable.entrySet().iterator(); | |
| 59 while (i.hasNext()) { | |
| 60 Entry e = (Entry)i.next(); | |
| 61 if (dfn(e) >= 0) { | |
| 62 // this thread was already visited | |
| 63 continue; | |
| 64 } | |
| 65 | |
| 66 thisDfn = globalDfn; | |
| 67 JavaThread thread = (JavaThread)e.getKey(); | |
| 68 previousThread = thread; | |
| 69 | |
| 70 // When there is a deadlock, all the monitors involved in the dependency | |
| 71 // cycle must be contended and heavyweight. So we only care about the | |
| 72 // heavyweight monitor a thread is waiting to lock. | |
| 73 try { | |
| 74 waitingToLockMonitor = thread.getCurrentPendingMonitor(); | |
| 75 } catch (RuntimeException re) { | |
| 76 tty.println("This version of HotSpot VM doesn't support deadlock detection."); | |
| 77 return; | |
| 78 } | |
| 79 | |
| 80 Klass abstractOwnableSyncKlass = null; | |
| 81 if (concurrentLocks) { | |
| 82 waitingToLockBlocker = thread.getCurrentParkBlocker(); | |
| 83 SystemDictionary sysDict = VM.getVM().getSystemDictionary(); | |
| 84 abstractOwnableSyncKlass = sysDict.getAbstractOwnableSynchronizerKlass(); | |
| 85 } | |
| 86 | |
| 87 while (waitingToLockMonitor != null || | |
| 88 waitingToLockBlocker != null) { | |
| 89 if (waitingToLockMonitor != null) { | |
| 90 currentThread = threads.owningThreadFromMonitor(waitingToLockMonitor); | |
| 91 } else { | |
| 92 if (concurrentLocks) { | |
| 93 if (waitingToLockBlocker.isA(abstractOwnableSyncKlass)) { | |
| 94 Oop threadOop = OopUtilities.abstractOwnableSynchronizerGetOwnerThread(waitingToLockBlocker); | |
| 95 if (threadOop != null) { | |
| 96 currentThread = OopUtilities.threadOopGetJavaThread(threadOop); | |
| 97 } | |
| 98 } | |
| 99 } | |
| 100 } | |
| 101 if (currentThread == null) { | |
| 102 // No dependency on another thread | |
| 103 break; | |
| 104 } | |
| 105 if (dfn(currentThread) < 0) { | |
| 106 // First visit to this thread | |
| 107 threadTable.put(currentThread, new Integer(globalDfn++)); | |
| 108 } else if (dfn(currentThread) < thisDfn) { | |
| 109 // Thread already visited, and not on a (new) cycle | |
| 110 break; | |
| 111 } else if (currentThread == previousThread) { | |
| 112 // Self-loop, ignore | |
| 113 break; | |
| 114 } else { | |
| 115 // We have a (new) cycle | |
| 116 numberOfDeadlocks ++; | |
| 117 printOneDeadlock(tty, currentThread, concurrentLocks); | |
| 118 break; | |
| 119 } | |
| 120 previousThread = currentThread; | |
| 121 waitingToLockMonitor = (ObjectMonitor)currentThread.getCurrentPendingMonitor(); | |
| 122 if (concurrentLocks) { | |
| 123 waitingToLockBlocker = currentThread.getCurrentParkBlocker(); | |
| 124 } | |
| 125 } | |
| 126 } | |
| 127 | |
| 128 switch (numberOfDeadlocks) { | |
| 129 case 0: | |
| 130 tty.println("No deadlocks found."); | |
| 131 break; | |
| 132 case 1: | |
| 133 tty.println("Found a total of 1 deadlock."); | |
| 134 break; | |
| 135 default: | |
| 136 tty.println("Found a total of " + numberOfDeadlocks + " deadlocks."); | |
| 137 break; | |
| 138 } | |
| 139 tty.println(); | |
| 140 } | |
| 141 | |
| 142 //-- Internals only below this point | |
| 143 private static Threads threads; | |
| 144 private static ObjectHeap heap; | |
| 145 private static HashMap threadTable; | |
| 146 | |
| 147 private static void createThreadTable() { | |
| 148 threadTable = new HashMap(); | |
| 149 for (JavaThread cur = threads.first(); cur != null; cur = cur.next()) { | |
| 150 // initialize dfn for each thread to -1 | |
| 151 threadTable.put(cur, new Integer(-1)); | |
| 152 } | |
| 153 } | |
| 154 | |
| 155 private static int dfn(JavaThread thread) { | |
| 156 Object obj = threadTable.get(thread); | |
| 157 if (obj != null) { | |
| 158 return ((Integer)obj).intValue(); | |
| 159 } | |
| 160 return -1; | |
| 161 } | |
| 162 | |
| 163 private static int dfn(Entry e) { | |
| 164 return ((Integer)e.getValue()).intValue(); | |
| 165 } | |
| 166 | |
| 167 private static void printOneDeadlock(PrintStream tty, JavaThread thread, | |
| 168 boolean concurrentLocks) { | |
| 169 tty.println("Found one Java-level deadlock:"); | |
| 170 tty.println("============================="); | |
| 171 ObjectMonitor waitingToLockMonitor = null; | |
| 172 Oop waitingToLockBlocker = null; | |
| 173 JavaThread currentThread = thread; | |
| 174 do { | |
| 175 tty.println(); | |
| 176 tty.println("\"" + currentThread.getThreadName() + "\":"); | |
| 177 waitingToLockMonitor = currentThread.getCurrentPendingMonitor(); | |
| 178 if (waitingToLockMonitor != null) { | |
| 179 tty.print(" waiting to lock Monitor@" + waitingToLockMonitor.getAddress()); | |
| 180 OopHandle obj = waitingToLockMonitor.object(); | |
| 181 Oop oop = heap.newOop(obj); | |
| 182 if (obj != null) { | |
| 183 tty.print(" (Object@"); | |
| 184 Oop.printOopAddressOn(oop, tty); | |
| 185 tty.print(", a " + oop.getKlass().getName().asString() + ")" ); | |
| 186 tty.print(",\n which is held by"); | |
| 187 } else { | |
| 188 // No Java object associated - a raw monitor | |
| 189 tty.print(" (raw monitor),\n which is held by"); | |
| 190 } | |
| 191 currentThread = threads.owningThreadFromMonitor(waitingToLockMonitor); | |
| 192 tty.print(" \"" + currentThread.getThreadName() + "\""); | |
| 193 } else if (concurrentLocks) { | |
| 194 waitingToLockBlocker = currentThread.getCurrentParkBlocker(); | |
| 195 tty.print(" waiting for ownable synchronizer "); | |
| 196 Oop.printOopAddressOn(waitingToLockBlocker, tty); | |
| 197 tty.print(", (a " + waitingToLockBlocker.getKlass().getName().asString() + ")" ); | |
| 198 Oop threadOop = OopUtilities.abstractOwnableSynchronizerGetOwnerThread(waitingToLockBlocker); | |
| 199 currentThread = OopUtilities.threadOopGetJavaThread(threadOop); | |
| 200 tty.print(",\n which is held by"); | |
| 201 tty.print(" \"" + currentThread.getThreadName() + "\""); | |
| 202 } | |
| 203 } while (!currentThread.equals(thread)); | |
| 204 tty.println(); | |
| 205 tty.println(); | |
| 206 } | |
| 207 } |