--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/share/classes/sun/nio/fs/NativeBuffer.java	Sun Feb 15 12:25:54 2009 +0000
@@ -0,0 +1,87 @@
+/*
+ * Copyright 2008-2009 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Sun designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Sun in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ */
+
+package sun.nio.fs;
+
+import sun.misc.Unsafe;
+import sun.misc.Cleaner;
+
+/**
+ * A light-weight buffer in native memory.
+ */
+
+class NativeBuffer {
+    private static final Unsafe unsafe = Unsafe.getUnsafe();
+
+    private final long address;
+    private final int size;
+    private final Cleaner cleaner;
+
+    // optional "owner" to avoid copying
+    // (only safe for use by thread-local caches)
+    private Object owner;
+
+    private static class Deallocator implements Runnable {
+        private final long address;
+        Deallocator(long address) {
+            this.address = address;
+        }
+        public void run() {
+            unsafe.freeMemory(address);
+        }
+    }
+
+    NativeBuffer(int size) {
+        this.address = unsafe.allocateMemory(size);
+        this.size = size;
+        this.cleaner = Cleaner.create(this, new Deallocator(address));
+    }
+
+    void release() {
+        NativeBuffers.releaseNativeBuffer(this);
+    }
+
+    long address() {
+        return address;
+    }
+
+    int size() {
+        return size;
+    }
+
+    Cleaner cleaner() {
+        return cleaner;
+    }
+
+    // not synchronized; only safe for use by thread-local caches
+    void setOwner(Object owner) {
+        this.owner = owner;
+    }
+
+    // not synchronized; only safe for use by thread-local caches
+    Object owner() {
+        return owner;
+    }
+}