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| 1 | /* | ||
| 2 | * Copyright (c) 2008, 2009, 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. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.nio.fs; | ||
| 27 | |||
| 28 | import sun.misc.Unsafe; | ||
| 29 | import sun.misc.Cleaner; | ||
| 30 | |||
| 31 | /** | ||
| 32 | * A light-weight buffer in native memory. | ||
| 33 | */ | ||
| 34 | |||
| 35 | class NativeBuffer { | ||
| 36 | private static final Unsafe unsafe = Unsafe.getUnsafe(); | ||
| 37 | |||
| 38 | private final long address; | ||
| 39 | private final int size; | ||
| 40 | private final Cleaner cleaner; | ||
| 41 | |||
| 42 | // optional "owner" to avoid copying | ||
| 43 | // (only safe for use by thread-local caches) | ||
| 44 | private Object owner; | ||
| 45 | |||
| 46 | private static class Deallocator implements Runnable { | ||
| 47 | private final long address; | ||
| 48 | Deallocator(long address) { | ||
| 49 | this.address = address; | ||
| 50 | } | ||
| 51 | public void run() { | ||
| 52 | unsafe.freeMemory(address); | ||
| 53 | } | ||
| 54 | } | ||
| 55 | |||
| 56 | NativeBuffer(int size) { | ||
| 57 | this.address = unsafe.allocateMemory(size); | ||
| 58 | this.size = size; | ||
| 59 | this.cleaner = Cleaner.create(this, new Deallocator(address)); | ||
| 60 | } | ||
| 61 | |||
| 62 | void release() { | ||
| 63 | NativeBuffers.releaseNativeBuffer(this); | ||
| 64 | } | ||
| 65 | |||
| 66 | long address() { | ||
| 67 | return address; | ||
| 68 | } | ||
| 69 | |||
| 70 | int size() { | ||
| 71 | return size; | ||
| 72 | } | ||
| 73 | |||
| 74 | Cleaner cleaner() { | ||
| 75 | return cleaner; | ||
| 76 | } | ||
| 77 | |||
| 78 | // not synchronized; only safe for use by thread-local caches | ||
| 79 | void setOwner(Object owner) { | ||
| 80 | this.owner = owner; | ||
| 81 | } | ||
| 82 | |||
| 83 | // not synchronized; only safe for use by thread-local caches | ||
| 84 | Object owner() { | ||
| 85 | return owner; | ||
| 86 | } | ||
| 87 | } | ||