Mercurial > hg > graal-compiler
view src/share/vm/runtime/threadCritical.hpp @ 1333:3f12a94552cc
Added tag jdk7-b88 for changeset 4b60f23c4223
author | mikejwre |
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date | Thu, 08 Apr 2010 17:02:41 -0700 |
parents | 98cb887364d3 |
children | c18cbe5936b8 |
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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 dependent 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(); };