jdk-24/hotspot/src/share/vm/gc/shared/gcId.hpp

/*
 * Copyright (c) 2014, 2015, 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_VM_GC_SHARED_GCID_HPP
#define SHARE_VM_GC_SHARED_GCID_HPP

#include "memory/allocation.hpp"

class GCId VALUE_OBJ_CLASS_SPEC {
 private:
  uint _id;
  GCId(uint id) : _id(id) {}
  GCId() { } // Unused

  static uint _next_id;
  static const uint UNDEFINED = (uint)-1;

 public:
  uint id() const {
    assert(_id != UNDEFINED, "Using undefined GC ID");
    return _id;
  }
  bool is_undefined() const;

  static const GCId create();
  static const GCId peek();
  static const GCId undefined();
};

#endif // SHARE_VM_GC_SHARED_GCID_HPP