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diff --git a/rts/Messages.h b/rts/Messages.h
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+/* ---------------------------------------------------------------------------
+ *
+ * (c) The GHC Team, 2010
+ *
+ * Inter-Capability message passing
+ *
+ * --------------------------------------------------------------------------*/
+
+BEGIN_RTS_PRIVATE
+
+nat messageBlackHole(Capability *cap, MessageBlackHole *msg);
+
+#ifdef THREADED_RTS
+void executeMessage (Capability *cap, Message *m);
+void sendMessage (Capability *from_cap, Capability *to_cap, Message *msg);
+#endif
+
+END_RTS_PRIVATE