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annotate src/share/vm/gc_implementation/concurrentMarkSweep/freeBlockDictionary.cpp @ 1951:899bbbdcb6ea

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6997298: fatal error: must own lock CMS_markBitMap_lock during heap dump Summary: Since we are at a stop-world pause, the existing CMS-phase checks are sufficient for safety, and the locking check can be safely elided. Elaborated documentation comment to the case where class unloading and verification are disabled, and the query happens when we aren't in the sweeping phase, where the answer "false" would be (almost everywhere) too pessimistic. Reviewed-by: jmasa, johnc, tonyp
author ysr
date Fri, 05 Nov 2010 13:20:37 -0700
parents c18cbe5936b8
children f95d63e2154a
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1 /*
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2 * Copyright (c) 2002, 2004, Oracle and/or its affiliates. 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 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.
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22 *
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23 */
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24
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25 # include "incls/_precompiled.incl"
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26 # include "incls/_freeBlockDictionary.cpp.incl"
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28 #ifndef PRODUCT
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29 Mutex* FreeBlockDictionary::par_lock() const {
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30 return _lock;
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31 }
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32
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33 void FreeBlockDictionary::set_par_lock(Mutex* lock) {
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34 _lock = lock;
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35 }
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36
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37 void FreeBlockDictionary::verify_par_locked() const {
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38 #ifdef ASSERT
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39 if (ParallelGCThreads > 0) {
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40 Thread* myThread = Thread::current();
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41 if (myThread->is_GC_task_thread()) {
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42 assert(par_lock() != NULL, "Should be using locking?");
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43 assert_lock_strong(par_lock());
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44 }
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45 }
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46 #endif // ASSERT
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47 }
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48 #endif