1 /*

     2  * Copyright (c) 2011, 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_VM_RUNTIME_SERVICETHREAD_HPP

    26 #define SHARE_VM_RUNTIME_SERVICETHREAD_HPP

    27 

    28 #include "runtime/thread.hpp"

    29 

    30 // A JavaThread for low memory detection support and JVMTI

    31 // compiled-method-load events.

    32 class ServiceThread : public JavaThread {

    33   friend class VMStructs;

    34  private:

    35 

    36   static ServiceThread* _instance;

    37 

    38   static void service_thread_entry(JavaThread* thread, TRAPS);

    39   ServiceThread(ThreadFunction entry_point) : JavaThread(entry_point) {};

    40 

    41  public:

    42   static void initialize();

    43 

    44   // Hide this thread from external view.

    45   bool is_hidden_from_external_view() const      { return true; }

    46 

    47   // Returns true if the passed thread is the service thread.

    48   static bool is_service_thread(Thread* thread);

    49 };

    50 

    51 #endif // SHARE_VM_RUNTIME_SERVICETHREAD_HPP