Mercurial > jdk8-mips64-public > hotspot / annotate
src/share/vm/gc_implementation/concurrentMarkSweep/freeBlockDictionary.cpp@3bfae429e2cf (annotated)
src/share/vm/gc_implementation/concurrentMarkSweep/freeBlockDictionary.cpp
Mon, 03 May 2010 10:24:51 -0700
- author
- ysr
- date
- Mon, 03 May 2010 10:24:51 -0700
- changeset 1873
- 3bfae429e2cf
- parent 435
- a61af66fc99e
- child 1907
- c18cbe5936b8
- permissions
- -rw-r--r--
6948537: CMS: BOT walkers observe out-of-thin-air zeros on sun4v sparc/CMT
Summary: On sun4v/CMT avoid use of memset() in BOT updates so as to prevent concurrent BOT readers from seeing the phantom zeros arising from memset()'s use of BIS.
Reviewed-by: jmasa, johnc, minqi, poonam, tonyp
| duke@435 | 1 | /* |
| duke@435 | 2 | * Copyright 2002-2004 Sun Microsystems, Inc. All Rights Reserved. |
| duke@435 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| duke@435 | 4 | * |
| duke@435 | 5 | * This code is free software; you can redistribute it and/or modify it |
| duke@435 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| duke@435 | 7 | * published by the Free Software Foundation. |
| duke@435 | 8 | * |
| duke@435 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| duke@435 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| duke@435 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| duke@435 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| duke@435 | 13 | * accompanied this code). |
| duke@435 | 14 | * |
| duke@435 | 15 | * You should have received a copy of the GNU General Public License version |
| duke@435 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| duke@435 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| duke@435 | 18 | * |
| duke@435 | 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| duke@435 | 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| duke@435 | 21 | * have any questions. |
| duke@435 | 22 | * |
| duke@435 | 23 | */ |
| duke@435 | 24 | |
| duke@435 | 25 | # include "incls/_precompiled.incl" |
| duke@435 | 26 | # include "incls/_freeBlockDictionary.cpp.incl" |
| duke@435 | 27 | |
| duke@435 | 28 | #ifndef PRODUCT |
| duke@435 | 29 | Mutex* FreeBlockDictionary::par_lock() const { |
| duke@435 | 30 | return _lock; |
| duke@435 | 31 | } |
| duke@435 | 32 | |
| duke@435 | 33 | void FreeBlockDictionary::set_par_lock(Mutex* lock) { |
| duke@435 | 34 | _lock = lock; |
| duke@435 | 35 | } |
| duke@435 | 36 | |
| duke@435 | 37 | void FreeBlockDictionary::verify_par_locked() const { |
| duke@435 | 38 | #ifdef ASSERT |
| duke@435 | 39 | if (ParallelGCThreads > 0) { |
| duke@435 | 40 | Thread* myThread = Thread::current(); |
| duke@435 | 41 | if (myThread->is_GC_task_thread()) { |
| duke@435 | 42 | assert(par_lock() != NULL, "Should be using locking?"); |
| duke@435 | 43 | assert_lock_strong(par_lock()); |
| duke@435 | 44 | } |
| duke@435 | 45 | } |
| duke@435 | 46 | #endif // ASSERT |
| duke@435 | 47 | } |
| duke@435 | 48 | #endif |
