Showing the changes to java/pkg/sun/nio/fs/NativeBuffer.java (1 of 18352 files). Show all
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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 | +} | |