1 /*
2 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "memory/allocation.inline.hpp"
27 #include "runtime/jniPeriodicChecker.hpp"
28 #include "runtime/task.hpp"
29
30
31 // --------------------------------------------------------
32 // Class to aid in periodic checking under CheckJNICalls
33 class JniPeriodicCheckerTask : public PeriodicTask {
34 public:
JniPeriodicCheckerTask(int interval_time)35 JniPeriodicCheckerTask(int interval_time) : PeriodicTask(interval_time) {}
task()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 */
engage()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 */
disengage()66 void JniPeriodicChecker::disengage() {
67 if (CheckJNICalls && is_active()) {
68 // remove JniPeriodicChecker
69 _task->disenroll();
70 delete _task;
71 _task = NULL;
72 }
73 }
74
jniPeriodicChecker_exit()75 void jniPeriodicChecker_exit() {
76 if (!CheckJNICalls) return;
77 }
78