Index: libcfa/src/iostream.cfa
===================================================================
--- libcfa/src/iostream.cfa	(revision 6f36dde5738ff3ea80437b7ebeab3b8a3f1f4a9d)
+++ libcfa/src/iostream.cfa	(revision 467c8b78d5b010b1a3570addb1eec6fd97d93c2d)
@@ -10,6 +10,6 @@
 // Created On       : Wed May 27 17:56:53 2015
 // Last Modified By : Peter A. Buhr
-// Last Modified On : Mon Aug 24 08:31:35 2020
-// Update Count     : 1130
+// Last Modified On : Sat Jan 16 11:24:50 2021
+// Update Count     : 1131
 //
 
@@ -397,4 +397,9 @@
 	ostype & nlOff( ostype & os ) {
 		nlOff( os );									// call void returning
+		return os;
+	} // nlOff
+
+	ostype & acquire( ostype & os ) {
+		acquire( os );									// call void returning
 		return os;
 	} // nlOff
Index: libcfa/src/iostream.hfa
===================================================================
--- libcfa/src/iostream.hfa	(revision 6f36dde5738ff3ea80437b7ebeab3b8a3f1f4a9d)
+++ libcfa/src/iostream.hfa	(revision 467c8b78d5b010b1a3570addb1eec6fd97d93c2d)
@@ -10,6 +10,6 @@
 // Created On       : Wed May 27 17:56:53 2015
 // Last Modified By : Peter A. Buhr
-// Last Modified On : Tue Aug 11 22:16:14 2020
-// Update Count     : 350
+// Last Modified On : Sat Jan 16 11:24:48 2021
+// Update Count     : 351
 //
 
@@ -41,4 +41,5 @@
 	void nlOn( ostype & );								// turn auto-newline state on
 	void nlOff( ostype & );								// turn auto-newline state off
+	void acquire( ostype & );							// acquire mutex lock
 
 	const char * sepGet( ostype & );					// get separator string
@@ -137,4 +138,5 @@
 	ostype & nlOn( ostype & );
 	ostype & nlOff( ostype & );
+	ostype & acquire( ostype & );
 } // distribution