--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/jdk/src/windows/classes/sun/nio/ch/WindowsAsynchronousChannelProvider.java	Sun Feb 15 12:25:54 2009 +0000
@@ -0,0 +1,101 @@
+/*
+ * 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.ch;
+
+import java.nio.channels.*;
+import java.nio.channels.spi.AsynchronousChannelProvider;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.ThreadFactory;
+import java.net.ProtocolFamily;
+import java.io.IOException;
+
+public class WindowsAsynchronousChannelProvider
+    extends AsynchronousChannelProvider
+{
+    private static volatile Iocp defaultIocp;
+
+    public WindowsAsynchronousChannelProvider() {
+        // nothing to do
+    }
+
+    private Iocp defaultIocp() throws IOException {
+        if (defaultIocp == null) {
+            synchronized (WindowsAsynchronousChannelProvider.class) {
+                if (defaultIocp == null) {
+                    // default thread pool may be shared with AsynchronousFileChannels
+                    defaultIocp = new Iocp(this, ThreadPool.getDefault()).start();
+                }
+            }
+        }
+        return defaultIocp;
+    }
+
+    @Override
+    public AsynchronousChannelGroup openAsynchronousChannelGroup(int nThreads, ThreadFactory factory)
+        throws IOException
+    {
+        return new Iocp(this, ThreadPool.create(nThreads, factory)).start();
+    }
+
+    @Override
+    public AsynchronousChannelGroup openAsynchronousChannelGroup(ExecutorService executor, int initialSize)
+        throws IOException
+    {
+        return new Iocp(this, ThreadPool.wrap(executor, initialSize)).start();
+    }
+
+    private Iocp toIocp(AsynchronousChannelGroup group) throws IOException {
+        if (group == null) {
+            return defaultIocp();
+        } else {
+            if (!(group instanceof Iocp))
+                throw new IllegalChannelGroupException();
+            return (Iocp)group;
+        }
+    }
+
+    @Override
+    public AsynchronousServerSocketChannel openAsynchronousServerSocketChannel(AsynchronousChannelGroup group)
+        throws IOException
+    {
+        return new WindowsAsynchronousServerSocketChannelImpl(toIocp(group));
+    }
+
+    @Override
+    public AsynchronousSocketChannel openAsynchronousSocketChannel(AsynchronousChannelGroup group)
+        throws IOException
+    {
+        return new WindowsAsynchronousSocketChannelImpl(toIocp(group));
+    }
+
+    @Override
+    public AsynchronousDatagramChannel openAsynchronousDatagramChannel(ProtocolFamily family,
+                                                                       AsynchronousChannelGroup group)
+        throws IOException
+    {
+        return new SimpleAsynchronousDatagramChannelImpl(family, toIocp(group));
+    }
+}