1 /*

     2  * Copyright (c) 2015, 2017, 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 #ifndef SHARE_GC_Z_ZTHREAD_HPP

    25 #define SHARE_GC_Z_ZTHREAD_HPP

    26 

    27 #include "memory/allocation.hpp"

    28 #include "utilities/debug.hpp"

    29 

    30 class ZThread : public AllStatic {

    31   friend class ZTask;

    32 

    33 private:

    34   static __thread bool      _initialized;

    35   static __thread uintptr_t _id;

    36   static __thread bool      _is_vm;

    37   static __thread bool      _is_java;

    38   static __thread bool      _is_worker;

    39   static __thread uint      _worker_id;

    40 

    41   static void initialize();

    42 

    43   static void ensure_initialized() {

    44     if (!_initialized) {

    45       initialize();

    46     }

    47   }

    48 

    49   static bool has_worker_id();

    50   static void set_worker_id(uint worker_id);

    51   static void clear_worker_id();

    52 

    53 public:

    54   static const char* name();

    55 

    56   static uintptr_t id() {

    57     ensure_initialized();

    58     return _id;

    59   }

    60 

    61   static bool is_vm() {

    62     ensure_initialized();

    63     return _is_vm;

    64   }

    65 

    66   static bool is_java() {

    67     ensure_initialized();

    68     return _is_java;

    69   }

    70 

    71   static bool is_worker() {

    72     ensure_initialized();

    73     return _is_worker;

    74   }

    75 

    76   static uint worker_id() {

    77     assert(has_worker_id(), "Worker id not initialized");

    78     return _worker_id;

    79   }

    80 };

    81 

    82 #endif // SHARE_GC_Z_ZTHREAD_HPP