/*
 * Copyright (c) 2022, 2024, 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.
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#ifndef SHARE_RUNTIME_THREADIDENTIFIER_HPP
#define SHARE_RUNTIME_THREADIDENTIFIER_HPP

#include "memory/allStatic.hpp"

/*
 * Provides unique monotonic identifiers for threads.
 *
 * Java uses unsafe to initialize the tid field for Thread and VirtualThread on construction.
 * JFR uses next() for a non-reusable id for non-java threads.
 */
class ThreadIdentifier : AllStatic {
 public:
  static int64_t next();
  static int64_t current();
  static int64_t unsafe_offset();
  static int64_t initial();
  static void verify_id(int64_t id) NOT_DEBUG_RETURN;
};

#endif // SHARE_RUNTIME_THREADIDENTIFIER_HPP