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src/share/vm/runtime/threadCritical.hpp@eef07cd490d4 (annotated)
src/share/vm/runtime/threadCritical.hpp
Wed, 03 Jul 2019 20:42:37 +0800
- author
- aoqi
- date
- Wed, 03 Jul 2019 20:42:37 +0800
- changeset 9637
- eef07cd490d4
- parent 6876
- 710a3c8b516e
- permissions
- -rw-r--r--
Merge
| aoqi@0 | 1 | /* |
| aoqi@0 | 2 | * Copyright (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved. |
| aoqi@0 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| aoqi@0 | 4 | * |
| aoqi@0 | 5 | * This code is free software; you can redistribute it and/or modify it |
| aoqi@0 | 6 | * under the terms of the GNU General Public License version 2 only, as |
| aoqi@0 | 7 | * published by the Free Software Foundation. |
| aoqi@0 | 8 | * |
| aoqi@0 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| aoqi@0 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| aoqi@0 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| aoqi@0 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| aoqi@0 | 13 | * accompanied this code). |
| aoqi@0 | 14 | * |
| aoqi@0 | 15 | * You should have received a copy of the GNU General Public License version |
| aoqi@0 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| aoqi@0 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| aoqi@0 | 18 | * |
| aoqi@0 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| aoqi@0 | 20 | * or visit www.oracle.com if you need additional information or have any |
| aoqi@0 | 21 | * questions. |
| aoqi@0 | 22 | * |
| aoqi@0 | 23 | */ |
| aoqi@0 | 24 | |
| aoqi@0 | 25 | #ifndef SHARE_VM_RUNTIME_THREADCRITICAL_HPP |
| aoqi@0 | 26 | #define SHARE_VM_RUNTIME_THREADCRITICAL_HPP |
| aoqi@0 | 27 | |
| aoqi@0 | 28 | #include "memory/allocation.hpp" |
| aoqi@0 | 29 | |
| aoqi@0 | 30 | // ThreadCritical is used to protect short non-blocking critical sections. |
| aoqi@0 | 31 | // This class must use no vm facilities that require initialization. |
| aoqi@0 | 32 | // It is used very early in the vm's initialization, in allocation |
| aoqi@0 | 33 | // code and other areas. ThreadCritical regions are reentrant. |
| aoqi@0 | 34 | // |
| aoqi@0 | 35 | // Due to race conditions during vm exit, some of the os level |
| aoqi@0 | 36 | // synchronization primitives may not be deallocated at exit. It |
| aoqi@0 | 37 | // is a good plan to implement the platform dependent sections of |
| aoqi@0 | 38 | // code with resources that are recoverable during process |
| aoqi@0 | 39 | // cleanup by the os. Calling the initialize method before use |
| aoqi@0 | 40 | // is also problematic, it is best to use preinitialized primitives |
| aoqi@0 | 41 | // if possible. As an example: |
| aoqi@0 | 42 | // |
| aoqi@0 | 43 | // mutex_t mp = DEFAULTMUTEX; |
| aoqi@0 | 44 | // |
| aoqi@0 | 45 | // Also note that this class is declared as a StackObj to enforce |
| aoqi@0 | 46 | // block structured short locks. It cannot be declared a ResourceObj |
| aoqi@0 | 47 | // or CHeapObj, due to initialization issues. |
| aoqi@0 | 48 | |
| aoqi@0 | 49 | class ThreadCritical : public StackObj { |
| aoqi@0 | 50 | friend class os; |
| aoqi@0 | 51 | private: |
| aoqi@0 | 52 | static void initialize(); |
| aoqi@0 | 53 | static void release(); |
| aoqi@0 | 54 | |
| aoqi@0 | 55 | public: |
| aoqi@0 | 56 | ThreadCritical(); |
| aoqi@0 | 57 | ~ThreadCritical(); |
| aoqi@0 | 58 | }; |
| aoqi@0 | 59 | |
| aoqi@0 | 60 | #endif // SHARE_VM_RUNTIME_THREADCRITICAL_HPP |
