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
33class 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
45JniPeriodicCheckerTask*              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 */
52void 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 */
66void JniPeriodicChecker::disengage() {
67  if (CheckJNICalls && is_active()) {
68    // remove JniPeriodicChecker
69    _task->disenroll();
70    delete _task;
71    _task = NULL;
72  }
73}
74
75void jniPeriodicChecker_exit() {
76  if (!CheckJNICalls) return;
77}
78