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