jniPeriodicChecker.cpp revision 1472:c18cbe5936b8 
1/*
2 * Copyright (c) 2007, 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 "incls/_precompiled.incl"
26# include "incls/_jniPeriodicChecker.cpp.incl"
27
28
29// --------------------------------------------------------
30// Class to aid in periodic checking under CheckJNICalls
31class JniPeriodicCheckerTask : public PeriodicTask {
32  public:
33     JniPeriodicCheckerTask(int interval_time) : PeriodicTask(interval_time) {}
34     void task() { os::run_periodic_checks(); }
35     static void engage();
36     static void disengage();
37};
38
39
40//----------------------------------------------------------
41// Implementation of JniPeriodicChecker
42
43JniPeriodicCheckerTask*              JniPeriodicChecker::_task   = NULL;
44
45/*
46 * The engage() method is called at initialization time via
47 * Thread::create_vm() to initialize the JniPeriodicChecker and
48 * register it with the WatcherThread as a periodic task.
49 */
50void JniPeriodicChecker::engage() {
51  if (CheckJNICalls && !is_active()) {
52    // start up the periodic task
53    _task = new JniPeriodicCheckerTask(10);
54    _task->enroll();
55  }
56}
57
58
59/*
60 * the disengage() method is responsible for deactivating the periodic
61 * task. This  method is called from before_exit() in java.cpp and is only called
62 * after the WatcherThread has been stopped.
63 */
64void JniPeriodicChecker::disengage() {
65  if (CheckJNICalls && is_active()) {
66    // remove JniPeriodicChecker
67    _task->disenroll();
68    delete _task;
69    _task = NULL;
70  }
71}
72
73void jniPeriodicChecker_exit() {
74  if (!CheckJNICalls) return;
75}
76