duke@435: /*
stefank@2314:  * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #include "precompiled.hpp"
stefank@2314: #include "memory/allocation.inline.hpp"
stefank@2314: #include "runtime/jniPeriodicChecker.hpp"
stefank@2314: #include "runtime/task.hpp"
duke@435: 
duke@435: 
duke@435: // --------------------------------------------------------
duke@435: // Class to aid in periodic checking under CheckJNICalls
duke@435: class JniPeriodicCheckerTask : public PeriodicTask {
duke@435:   public:
duke@435:      JniPeriodicCheckerTask(int interval_time) : PeriodicTask(interval_time) {}
duke@435:      void task() { os::run_periodic_checks(); }
duke@435:      static void engage();
duke@435:      static void disengage();
duke@435: };
duke@435: 
duke@435: 
duke@435: //----------------------------------------------------------
duke@435: // Implementation of JniPeriodicChecker
duke@435: 
duke@435: JniPeriodicCheckerTask*              JniPeriodicChecker::_task   = NULL;
duke@435: 
duke@435: /*
duke@435:  * The engage() method is called at initialization time via
duke@435:  * Thread::create_vm() to initialize the JniPeriodicChecker and
duke@435:  * register it with the WatcherThread as a periodic task.
duke@435:  */
duke@435: void JniPeriodicChecker::engage() {
duke@435:   if (CheckJNICalls && !is_active()) {
duke@435:     // start up the periodic task
duke@435:     _task = new JniPeriodicCheckerTask(10);
duke@435:     _task->enroll();
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
duke@435: /*
duke@435:  * the disengage() method is responsible for deactivating the periodic
duke@435:  * task. This  method is called from before_exit() in java.cpp and is only called
duke@435:  * after the WatcherThread has been stopped.
duke@435:  */
duke@435: void JniPeriodicChecker::disengage() {
duke@435:   if (CheckJNICalls && is_active()) {
duke@435:     // remove JniPeriodicChecker
duke@435:     _task->disenroll();
duke@435:     delete _task;
duke@435:     _task = NULL;
duke@435:   }
duke@435: }
duke@435: 
duke@435: void jniPeriodicChecker_exit() {
duke@435:   if (!CheckJNICalls) return;
duke@435: }