Mercurial > hg > truffle
comparison src/share/vm/runtime/threadCritical.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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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 }; |