author | alanb |
Sun, 15 Feb 2009 12:25:54 +0000 | |
changeset 2057 | 3acf8e5e2ca0 |
child 5506 | 202f599c92aa |
permissions | -rw-r--r-- |
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/* |
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* Copyright 2008-2009 Sun Microsystems, Inc. All Rights Reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Sun designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Sun in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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* CA 95054 USA or visit www.sun.com if you need additional information or |
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* have any questions. |
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*/ |
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package sun.nio.fs; |
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|
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import sun.misc.Unsafe; |
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import sun.misc.Cleaner; |
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/** |
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* A light-weight buffer in native memory. |
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*/ |
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class NativeBuffer { |
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private static final Unsafe unsafe = Unsafe.getUnsafe(); |
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private final long address; |
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private final int size; |
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private final Cleaner cleaner; |
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// optional "owner" to avoid copying |
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// (only safe for use by thread-local caches) |
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private Object owner; |
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private static class Deallocator implements Runnable { |
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private final long address; |
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Deallocator(long address) { |
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this.address = address; |
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} |
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public void run() { |
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unsafe.freeMemory(address); |
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} |
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} |
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NativeBuffer(int size) { |
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this.address = unsafe.allocateMemory(size); |
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this.size = size; |
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this.cleaner = Cleaner.create(this, new Deallocator(address)); |
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} |
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void release() { |
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NativeBuffers.releaseNativeBuffer(this); |
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} |
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long address() { |
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return address; |
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} |
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int size() { |
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return size; |
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} |
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Cleaner cleaner() { |
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return cleaner; |
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} |
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// not synchronized; only safe for use by thread-local caches |
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void setOwner(Object owner) { |
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this.owner = owner; |
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} |
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// not synchronized; only safe for use by thread-local caches |
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Object owner() { |
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return owner; |
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} |
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} |