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src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.hpp@3bfae429e2cf (annotated)

src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.hpp

Mon, 03 May 2010 10:24:51 -0700

author

ysr

date

Mon, 03 May 2010 10:24:51 -0700

changeset 1873

3bfae429e2cf

parent 1580

e018e6884bd8

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 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	///////////// Locking verification specific to CMS //////////////
duke@435	26	// Much like "assert_lock_strong()", except
duke@435	27	// that it relaxes the assertion somewhat for the parallel GC case, where
duke@435	28	// main GC thread or the CMS thread might hold the lock on behalf of
duke@435	29	// the parallel threads.
duke@435	30	class CMSLockVerifier: AllStatic {
duke@435	31	public:
ysr@1580	32	static void assert_locked(const Mutex* lock, const Mutex* p_lock1, const Mutex* p_lock2)
duke@435	33	PRODUCT_RETURN;
ysr@1580	34	static void assert_locked(const Mutex* lock, const Mutex* p_lock) {
ysr@1580	35	assert_locked(lock, p_lock, NULL);
ysr@1580	36	}
duke@435	37	static void assert_locked(const Mutex* lock) {
duke@435	38	assert_locked(lock, NULL);
duke@435	39	}
duke@435	40	};