Mercurial > hg > truffle
view src/share/vm/runtime/threadCritical.hpp @ 10:28372612af5e
6362677: Change parallel GC collector default number of parallel GC threads.
Summary: Use the same default number of GC threads as used by ParNewGC and ConcMarkSweepGC (i.e., the 5/8th rule).
Reviewed-by: ysr, tonyp
author | jmasa |
---|---|
date | Fri, 22 Feb 2008 17:17:14 -0800 |
parents | a61af66fc99e |
children | 98cb887364d3 |
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/* * Copyright 2001-2002 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ // ThreadCritical is used to protect short non-blocking critical sections. // This class must use no vm facilities that require initialization. // It is used very early in the vm's initialization, in allocation // code and other areas. ThreadCritical regions are reentrant. // // Due to race conditions during vm exit, some of the os level // synchronization primitives may not be deallocated at exit. It // is a good plan to implement the platform dependant sections of // code with resources that are recoverable during process // cleanup by the os. Calling the initialize method before use // is also problematic, it is best to use preinitialized primitives // if possible. As an example: // // mutex_t mp = DEFAULTMUTEX; // // Also note that this class is declared as a StackObj to enforce // block structured short locks. It cannot be declared a ResourceObj // or CHeapObj, due to initialization issues. class ThreadCritical : public StackObj { friend class os; private: static void initialize(); static void release(); public: ThreadCritical(); ~ThreadCritical(); };