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 21 * questions. 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_ */