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
  31 class 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 
  43 JniPeriodicCheckerTask*              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  */
  50 void 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  */
  64 void JniPeriodicChecker::disengage() {
  65   if (CheckJNICalls && is_active()) {
  66     // remove JniPeriodicChecker
  67     _task->disenroll();
  68     delete _task;
  69     _task = NULL;
  70   }
  71 }
  72 
  73 void jniPeriodicChecker_exit() {
  74   if (!CheckJNICalls) return;
  75 }