Index: libcfa/src/concurrency/thread.hfa
===================================================================
--- libcfa/src/concurrency/thread.hfa	(revision 3e2b9c93dff631bddb430d876a83bcc3bafe9d16)
+++ libcfa/src/concurrency/thread.hfa	(revision 17b6fc908a133d89cebcf6a017815c8623197ff5)
@@ -106,4 +106,9 @@
 void sleep( Duration duration );
 
+//----------
+// join
+forall( dtype T | is_thread(T) )
+T & join( T & this );
+
 // Local Variables: //
 // mode: c //