Mercurial > hg > truffle
comparison src/share/vm/runtime/threadCritical.hpp @ 0:a61af66fc99e jdk7-b24
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| author | duke |
|---|---|
| date | Sat, 01 Dec 2007 00:00:00 +0000 |
| parents | |
| children | 98cb887364d3 |
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| -1:000000000000 | 0:a61af66fc99e |
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| 1 /* | |
| 2 * Copyright 2001-2002 Sun Microsystems, Inc. All Rights Reserved. | |
| 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 * | |
| 19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
| 20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
| 21 * have any questions. | |
| 22 * | |
| 23 */ | |
| 24 | |
| 25 // ThreadCritical is used to protect short non-blocking critical sections. | |
| 26 // This class must use no vm facilities that require initialization. | |
| 27 // It is used very early in the vm's initialization, in allocation | |
| 28 // code and other areas. ThreadCritical regions are reentrant. | |
| 29 // | |
| 30 // Due to race conditions during vm exit, some of the os level | |
| 31 // synchronization primitives may not be deallocated at exit. It | |
| 32 // is a good plan to implement the platform dependant sections of | |
| 33 // code with resources that are recoverable during process | |
| 34 // cleanup by the os. Calling the initialize method before use | |
| 35 // is also problematic, it is best to use preinitialized primitives | |
| 36 // if possible. As an example: | |
| 37 // | |
| 38 // mutex_t mp = DEFAULTMUTEX; | |
| 39 // | |
| 40 // Also note that this class is declared as a StackObj to enforce | |
| 41 // block structured short locks. It cannot be declared a ResourceObj | |
| 42 // or CHeapObj, due to initialization issues. | |
| 43 | |
| 44 class ThreadCritical : public StackObj { | |
| 45 friend class os; | |
| 46 private: | |
| 47 static void initialize(); | |
| 48 static void release(); | |
| 49 | |
| 50 public: | |
| 51 ThreadCritical(); | |
| 52 ~ThreadCritical(); | |
| 53 }; |