jdk8-mips64-public/hotspot: src/share/vm/runtime/jniPeriodicChecker.cpp@91ddc23482a4

     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  */

    25 #include "precompiled.hpp"

    26 #include "memory/allocation.inline.hpp"

    27 #include "runtime/jniPeriodicChecker.hpp"

    28 #include "runtime/task.hpp"

    31 // --------------------------------------------------------

    32 // Class to aid in periodic checking under CheckJNICalls

    33 class 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 };

    42 //----------------------------------------------------------

    43 // Implementation of JniPeriodicChecker

    45 JniPeriodicCheckerTask*              JniPeriodicChecker::_task   = NULL;

    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  */

    52 void JniPeriodicChecker::engage() {

    53   if (CheckJNICalls && !is_active()) {

    54     // start up the periodic task

    55     _task = new JniPeriodicCheckerTask(10);

    56     _task->enroll();

    57   }

    58 }

    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  */

    66 void JniPeriodicChecker::disengage() {

    67   if (CheckJNICalls && is_active()) {

    68     // remove JniPeriodicChecker

    69     _task->disenroll();

    70     delete _task;

    71     _task = NULL;

    72   }

    73 }

    75 void jniPeriodicChecker_exit() {

    76   if (!CheckJNICalls) return;

    77 }

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