Mercurial > hg > graal-compiler
annotate src/share/vm/runtime/threadCritical.hpp @ 4712:e7dead7e90af
7117303: VM uses non-monotonic time source and complains that it is non-monotonic
Summary: Replaces calls to os::javaTimeMillis(), which does not (and cannot) guarantee monotonicity, in GC code to an equivalent expression that uses os::javaTimeNanos(). os::javaTimeNanos is guaranteed monotonically non-decreasing if the underlying platform provides a monotonic time source. Changes in OS files are to make use of the newly defined constants in globalDefinitions.hpp.
Reviewed-by: dholmes, ysr
author | johnc |
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date | Mon, 19 Dec 2011 10:02:05 -0800 |
parents | f95d63e2154a |
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rev | line source |
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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 |