more work on continuation support

classpath/java/util/concurrent/Callable.java

@@ -0,0 +1,15 @@
+/* Copyright (c) 2009, Avian Contributors
+
+   Permission to use, copy, modify, and/or distribute this software
+   for any purpose with or without fee is hereby granted, provided
+   that the above copyright notice and this permission notice appear
+   in all copies.
+
+   There is NO WARRANTY for this software.  See license.txt for
+   details. */
+
+package java.util.concurrent;
+
+public interface Callable<T> {
+  public T call() throws Exception;
+}