1 

     2 /*

     3 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.

     4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

     5 *

     6 * This code is free software; you can redistribute it and/or modify it

     7 * under the terms of the GNU General Public License version 2 only, as

     8 * published by the Free Software Foundation.

     9 *

    10 * This code is distributed in the hope that it will be useful, but WITHOUT

    11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

    12 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

    13 * version 2 for more details (a copy is included in the LICENSE file that

    14 * accompanied this code).

    15 *

    16 * You should have received a copy of the GNU General Public License version

    17 * 2 along with this work; if not, write to the Free Software Foundation,

    18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

    19 *

    20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    21 * or visit www.oracle.com if you need additional information or have any

    22 * questions.

    23 *

    24 */

    25 

    26 #ifndef SHARE_SERVICES_THREADIDTABLE_HPP

    27 #define SHARE_SERVICES_THREADIDTABLE_HPP

    28 

    29 #include "memory/allocation.hpp"

    30 

    31 class JavaThread;

    32 class ThreadsList;

    33 class ThreadIdTableConfig;

    34 

    35 class ThreadIdTable : public AllStatic {

    36   friend class ThreadIdTableConfig;

    37 

    38   static volatile bool _is_initialized;

    39 

    40 public:

    41   // Initialization

    42   static void lazy_initialize(const ThreadsList* threads);

    43   static bool is_initialized() { return _is_initialized; }

    44 

    45   // Lookup and list management

    46   static JavaThread* find_thread_by_tid(jlong tid);

    47   static JavaThread* add_thread(jlong tid, JavaThread* thread);

    48   static bool remove_thread(jlong tid);

    49 

    50 private:

    51   static void create_table(size_t size);

    52 

    53   static size_t table_size();

    54   static double get_load_factor();

    55   static void grow_if_required();

    56   static void grow(JavaThread* jt);

    57 

    58   static void item_added();

    59   static void item_removed();

    60 };

    61 

    62 #endif // SHARE_SERVICES_THREADIDTABLE_HPP