Mercurial > hg > truffle
annotate src/share/vm/runtime/threadCritical.hpp @ 4155:394404b2d9bd
Removed strict requirement for GRAAL environment variable. It only needs to be set now if the graal directory is not in the directory hierarchy of GraalVM JDK.
| author | Doug Simon <doug.simon@oracle.com> |
|---|---|
| date | Wed, 21 Dec 2011 11:25:27 +0100 |
| parents | f95d63e2154a |
| children |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 1972 | 2 * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_RUNTIME_THREADCRITICAL_HPP |
| 26 #define SHARE_VM_RUNTIME_THREADCRITICAL_HPP | |
| 27 | |
| 28 #include "memory/allocation.hpp" | |
| 29 | |
| 0 | 30 // ThreadCritical is used to protect short non-blocking critical sections. |
| 31 // This class must use no vm facilities that require initialization. | |
| 32 // It is used very early in the vm's initialization, in allocation | |
| 33 // code and other areas. ThreadCritical regions are reentrant. | |
| 34 // | |
| 35 // Due to race conditions during vm exit, some of the os level | |
| 36 // synchronization primitives may not be deallocated at exit. It | |
| 605 | 37 // is a good plan to implement the platform dependent sections of |
| 0 | 38 // code with resources that are recoverable during process |
| 39 // cleanup by the os. Calling the initialize method before use | |
| 40 // is also problematic, it is best to use preinitialized primitives | |
| 41 // if possible. As an example: | |
| 42 // | |
| 43 // mutex_t mp = DEFAULTMUTEX; | |
| 44 // | |
| 45 // Also note that this class is declared as a StackObj to enforce | |
| 46 // block structured short locks. It cannot be declared a ResourceObj | |
| 47 // or CHeapObj, due to initialization issues. | |
| 48 | |
| 49 class ThreadCritical : public StackObj { | |
| 50 friend class os; | |
| 51 private: | |
| 52 static void initialize(); | |
| 53 static void release(); | |
| 54 | |
| 55 public: | |
| 56 ThreadCritical(); | |
| 57 ~ThreadCritical(); | |
| 58 }; | |
| 1972 | 59 |
| 60 #endif // SHARE_VM_RUNTIME_THREADCRITICAL_HPP |