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diff --git a/external/jsr166/java/util/concurrent/RunnableFuture.java b/external/jsr166/java/util/concurrent/RunnableFuture.java
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+/*
+ * Written by Doug Lea with assistance from members of JCP JSR-166
+ * Expert Group and released to the public domain, as explained at
+ * http://creativecommons.org/licenses/publicdomain
+ */
+
+package java.util.concurrent;
+
+/**
+ * A {@link Future} that is {@link Runnable}. Successful execution of
+ * the <tt>run</tt> method causes completion of the <tt>Future</tt>
+ * and allows access to its results.
+ * @see FutureTask
+ * @see Executor
+ * @since 1.6
+ * @author Doug Lea
+ * @param <V> The result type returned by this Future's <tt>get</tt> method
+ */
+public interface RunnableFuture<V> extends Runnable, Future<V> {
+    /**
+     * Sets this Future to the result of its computation
+     * unless it has been cancelled.
+     */
+    void run();
+}