1 /*
   2  * Copyright (c) 2019, 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 #ifndef SHARE_RUNTIME_NOTIFICATIONTHREAD_HPP
  26 #define SHARE_RUNTIME_NOTIFICATIONTHREAD_HPP
  27 
  28 #include "runtime/thread.hpp"
  29 
  30 // A JavaThread for low memory detection support, GC and
  31 // diagnostic framework notifications. This thread is not hidden
  32 // from the external view to allow the debugger to stop at the
  33 // breakpoints inside registred MXBean notification listeners.
  34 
  35 class NotificationThread : public JavaThread {
  36   friend class VMStructs;
  37  private:
  38 
  39   static NotificationThread* _instance;
  40 
  41   static void notification_thread_entry(JavaThread* thread, TRAPS);
  42   NotificationThread(ThreadFunction entry_point) : JavaThread(entry_point) {};
  43 
  44  public:
  45   static void initialize();
  46 
  47 };
  48 
  49 #endif // SHARE_RUNTIME_NOTIFICATIONTHREAD_HPP