hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/cmsLockVerifier.hpp
author ysr
Wed, 23 Dec 2009 09:23:54 -0800
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child 5547 f4b087cbb361
permissions -rw-r--r--
6631166: CMS: better heuristics when combatting fragmentation Summary: Autonomic per-worker free block cache sizing, tunable coalition policies, fixes to per-size block statistics, retuned gain and bandwidth of some feedback loop filters to allow quicker reactivity to abrupt changes in ambient demand, and other heuristics to reduce fragmentation of the CMS old gen. Also tightened some assertions, including those related to locking. Reviewed-by: jmasa
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/*
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 * Copyright 2002 Sun Microsystems, Inc.  All Rights Reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 *
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 */
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///////////// Locking verification specific to CMS //////////////
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// Much like "assert_lock_strong()", except
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// that it relaxes the assertion somewhat for the parallel GC case, where
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// main GC thread or the CMS thread might hold the lock on behalf of
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// the parallel threads.
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class CMSLockVerifier: AllStatic {
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 public:
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  static void assert_locked(const Mutex* lock, const Mutex* p_lock1, const Mutex* p_lock2)
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    PRODUCT_RETURN;
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  static void assert_locked(const Mutex* lock, const Mutex* p_lock) {
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    assert_locked(lock, p_lock, NULL);
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  }
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  static void assert_locked(const Mutex* lock) {
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    assert_locked(lock, NULL);
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  }
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};