+%*********************************************************
+%* *
+\subsection{Controlling asynchronous exception delivery}
+%* *
+%*********************************************************
+
+\begin{code}
+#ifndef __HUGS__
+blockAsyncExceptions :: IO a -> IO a
+blockAsyncExceptions (IO io) = IO $ blockAsyncExceptions# io
+
+unblockAsyncExceptions :: IO a -> IO a
+unblockAsyncExceptions (IO io) = IO $ unblockAsyncExceptions# io
+#else
+-- Not implemented yet in Hugs.
+blockAsyncExceptions :: IO a -> IO a
+blockAsyncExceptions (IO io) = IO io
+
+unblockAsyncExceptions :: IO a -> IO a
+unblockAsyncExceptions (IO io) = IO io
+#endif
+\end{code}
+