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annotate src/share/vm/runtime/jniPeriodicChecker.cpp @ 5274:e72dd6533eb9
documented importance of nmethod::_graal_compiled_method wrt code unloading and GC
author | Doug Simon <doug.simon@oracle.com> |
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date | Mon, 23 Apr 2012 15:42:30 +0200 |
parents | f95d63e2154a |
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rev | line source |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2007, 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 #include "precompiled.hpp" |
26 #include "memory/allocation.inline.hpp" | |
27 #include "runtime/jniPeriodicChecker.hpp" | |
28 #include "runtime/task.hpp" | |
0 | 29 |
30 | |
31 // -------------------------------------------------------- | |
32 // Class to aid in periodic checking under CheckJNICalls | |
33 class JniPeriodicCheckerTask : public PeriodicTask { | |
34 public: | |
35 JniPeriodicCheckerTask(int interval_time) : PeriodicTask(interval_time) {} | |
36 void task() { os::run_periodic_checks(); } | |
37 static void engage(); | |
38 static void disengage(); | |
39 }; | |
40 | |
41 | |
42 //---------------------------------------------------------- | |
43 // Implementation of JniPeriodicChecker | |
44 | |
45 JniPeriodicCheckerTask* JniPeriodicChecker::_task = NULL; | |
46 | |
47 /* | |
48 * The engage() method is called at initialization time via | |
49 * Thread::create_vm() to initialize the JniPeriodicChecker and | |
50 * register it with the WatcherThread as a periodic task. | |
51 */ | |
52 void JniPeriodicChecker::engage() { | |
53 if (CheckJNICalls && !is_active()) { | |
54 // start up the periodic task | |
55 _task = new JniPeriodicCheckerTask(10); | |
56 _task->enroll(); | |
57 } | |
58 } | |
59 | |
60 | |
61 /* | |
62 * the disengage() method is responsible for deactivating the periodic | |
63 * task. This method is called from before_exit() in java.cpp and is only called | |
64 * after the WatcherThread has been stopped. | |
65 */ | |
66 void JniPeriodicChecker::disengage() { | |
67 if (CheckJNICalls && is_active()) { | |
68 // remove JniPeriodicChecker | |
69 _task->disenroll(); | |
70 delete _task; | |
71 _task = NULL; | |
72 } | |
73 } | |
74 | |
75 void jniPeriodicChecker_exit() { | |
76 if (!CheckJNICalls) return; | |
77 } |