Add dlists to USING:

diff --git a/library/threads.factor b/library/threads.factor
index 8cda298a8d5a7bdea66951594ff050abc56042e9..b41ce766a0cd95f1e386dbf57d1e9194907d7b40 100644 (file)
--- a/library/threads.factor
+++ b/library/threads.factor
@@ -2,7 +2,7 @@
 ! Copyright (C) 2005 Mackenzie Straight.
 ! See http://factor.sf.net/license.txt for BSD license.
 IN: threads
-USING: io-internals kernel kernel-internals lists namespaces ;
+USING: dlists io-internals kernel kernel-internals lists namespaces ;
  
 ! Core of the multitasker. Used by io-internals.factor and
 ! in-thread.factor.