/*

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

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

*

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

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

* published by the Free Software Foundation.

*

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

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

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

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

* accompanied this code).

*

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

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

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

*

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

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

* questions.

*

*/

#ifndef SHARE_SERVICES_THREADIDTABLE_HPP

#define SHARE_SERVICES_THREADIDTABLE_HPP

#include "memory/allocation.hpp"

class JavaThread;

class ThreadsList;

class ThreadIdTableConfig;

class ThreadIdTable : public AllStatic {

  friend class ThreadIdTableConfig;

  static volatile bool _is_initialized;

  static volatile bool _has_work;

public:

  // Initialization

  static void lazy_initialize(const ThreadsList* threads);

  static bool is_initialized() { return _is_initialized; }

  // Lookup and list management

  static JavaThread* find_thread_by_tid(jlong tid);

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

  static bool remove_thread(jlong tid);

  // Growing

  static bool has_work() { return _has_work; }

  static void do_concurrent_work(JavaThread* jt);

private:

  static void create_table(size_t size);

  static size_t table_size();

  static double get_load_factor();

  static void check_concurrent_work();

  static void trigger_concurrent_work();

  static void grow(JavaThread* jt);

  static void item_added();

  static void item_removed();

};

#endif // SHARE_SERVICES_THREADIDTABLE_HPP