/*

 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "memory/allocation.inline.hpp"

#include "runtime/jniPeriodicChecker.hpp"

#include "runtime/task.hpp"

// --------------------------------------------------------

// Class to aid in periodic checking under CheckJNICalls

class JniPeriodicCheckerTask : public PeriodicTask {

  public:

     JniPeriodicCheckerTask(int interval_time) : PeriodicTask(interval_time) {}

     void task() { os::run_periodic_checks(); }

     static void engage();

     static void disengage();

};

//----------------------------------------------------------

// Implementation of JniPeriodicChecker

JniPeriodicCheckerTask*              JniPeriodicChecker::_task   = NULL;

/*

 * The engage() method is called at initialization time via

 * Thread::create_vm() to initialize the JniPeriodicChecker and

 * register it with the WatcherThread as a periodic task.

 */

void JniPeriodicChecker::engage() {

  if (CheckJNICalls && !is_active()) {

    // start up the periodic task

    _task = new JniPeriodicCheckerTask(10);

    _task->enroll();

  }

}

/*

 * the disengage() method is responsible for deactivating the periodic

 * task. This  method is called from before_exit() in java.cpp and is only called

 * after the WatcherThread has been stopped.

 */

void JniPeriodicChecker::disengage() {

  if (CheckJNICalls && is_active()) {

    // remove JniPeriodicChecker

    _task->disenroll();

    delete _task;

    _task = NULL;

  }

}

void jniPeriodicChecker_exit() {

  if (!CheckJNICalls) return;

}