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diff --git a/libjava/classpath/java/nio/channels/spi/AbstractInterruptibleChannel.java b/libjava/classpath/java/nio/channels/spi/AbstractInterruptibleChannel.java
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+/* AbstractInterruptibleChannel.java -- 
+   Copyright (C) 2002, 2004 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath 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 for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
+
+package java.nio.channels.spi;
+
+import java.io.IOException;
+import java.nio.channels.AsynchronousCloseException;
+import java.nio.channels.Channel;
+import java.nio.channels.InterruptibleChannel;
+
+
+/**
+ * @author Michael Koch
+ * @since 1.4
+ */
+public abstract class AbstractInterruptibleChannel
+  implements Channel, InterruptibleChannel
+{
+  private boolean closed;
+
+  /**
+   * Initializes the channel.
+   */
+  protected AbstractInterruptibleChannel()
+  {
+  }
+
+  /**
+   * Marks the beginning of an I/O operation that might block indefinitely.
+   */
+  protected final void begin()
+  {
+  }
+
+  /**
+   * Closes the channel.
+   *
+   * @exception IOException If an error occurs
+   */
+  public final void close() throws IOException
+  {
+    if (! closed)
+      {
+	closed = true;
+	implCloseChannel();
+      }
+  }
+
+  /**
+   * Marks the end of an I/O operation that might block indefinitely.
+   *
+   * @param completed true if the task completed successfully,
+   * false otherwise
+   *
+   * @exception IOException if an error occurs
+   * @exception AsynchronousCloseException If the channel was asynchronously
+   * closed.
+   * @exception ClosedByInterruptException If the thread blocked in the
+   * I/O operation was interrupted.
+   */
+  protected final void end(boolean completed)
+    throws AsynchronousCloseException
+  {
+    // FIXME: check more here.
+    
+    if (closed) throw new AsynchronousCloseException();
+  }
+
+  /**
+   * Closes the channel.
+   *
+   * @exception IOException If an error occurs
+   */
+  protected abstract void implCloseChannel() throws IOException;
+
+  /**
+   * Tells whether or not this channel is open.
+   * 
+   * @return true if the channel is open, false otherwise 
+   */
+  public final boolean isOpen()
+  {
+    return ! closed;
+  }
+}