1 /*
   2  * Copyright (c) 2012, 2018, 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
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  22  *
  23  */
  24 
  25 #ifndef SHARE_MEMORY_METASPACE_METABLOCK_HPP_
  26 #define SHARE_MEMORY_METASPACE_METABLOCK_HPP_
  27 
  28 #include "memory/metaspace/metabase.hpp"
  29 #include "utilities/globalDefinitions.hpp"
  30 
  31 namespace metaspace {
  32 namespace internals {
  33 
  34 // Metablock is the unit of allocation from a Chunk.
  35 //
  36 // A Metablock may be reused by its SpaceManager but are never moved between
  37 // SpaceManagers.  There is no explicit link to the Metachunk
  38 // from which it was allocated.  Metablock may be deallocated and
  39 // put on a freelist but the space is never freed, rather
  40 // the Metachunk it is a part of will be deallocated when it's
  41 // associated class loader is collected.
  42 
  43 class Metablock : public Metabase<Metablock> {
  44   friend class VMStructs;
  45  public:
  46   Metablock(size_t word_size) : Metabase<Metablock>(word_size) {}
  47 };
  48 
  49 } // namespace metaspace
  50 } // namespace internals
  51 
  52 #endif /* SHARE_MEMORY_METASPACE_METABLOCK_HPP_ */