diff --git a/scheme/httpd/surflets/packages.scm b/scheme/httpd/surflets/packages.scm
index d4eba02..20bffef 100644
--- a/scheme/httpd/surflets/packages.scm
+++ b/scheme/httpd/surflets/packages.scm
@@ -260,6 +260,9 @@
 	  rt-structure-binding
 	  load-structure))
 
+(define-interface with-locks-interface
+  (export with-lock))
+
 ;; With the help of TYPED-OPTIONALS you can define a function
 ;; like (make-submit-button [string] args)
 (define-interface typed-optionals-interface
@@ -375,9 +378,10 @@
 	locks				;MAKE-LOCK et al.
 	profiling			;PROFILE-SPACE
 	rt-module-language		;get structures dynamically
-        search-trees
 	scheme-with-scsh		;regexp et al.
+        search-trees
 	shift-reset			;SHIFT and RESET
+        (subset srfi-1 (alist-cons alist-delete!))
 	srfi-6				;string-ports
 	srfi-14				;CHAR-SET:DIGIT
 	srfi-27				;random numbers
@@ -389,7 +393,7 @@
 	thread-safe-counter
 	threads				;SLEEP
 	uri				;URI-PATH-LIST->PATH
-        (subset srfi-1 (alist-cons alist-delete!))
+	with-locks			;WITH-LOCK
 	)
   (files surflet-handler))
 
@@ -636,3 +640,8 @@
 	package-commands-internal)
   (files rt-module))
 
+(define-structure with-locks with-locks-interface
+  (open scheme
+	locks)
+  (files with-locks))
+
diff --git a/scheme/httpd/surflets/surflet-handler.scm b/scheme/httpd/surflets/surflet-handler.scm
index bd1472e..7931671 100644
--- a/scheme/httpd/surflets/surflet-handler.scm
+++ b/scheme/httpd/surflets/surflet-handler.scm
@@ -149,15 +149,6 @@
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
-;; doesn't belong to here...
-(define (with-lock lock thunk)
-  (dynamic-wind
-   (lambda ()
-     (obtain-lock lock))
-   thunk
-   (lambda ()
-     (release-lock lock))))
-
 ;;; RESUME-URL
 ;; Resumes a suspended URL and returns a (HTTP-)RESPONSE. PATH-STRING
 ;; is the virtual path, SURFLET-PATH a string pointing to the real
diff --git a/scheme/httpd/surflets/with-locks.scm b/scheme/httpd/surflets/with-locks.scm
new file mode 100644
index 0000000..a3b6181
--- /dev/null
+++ b/scheme/httpd/surflets/with-locks.scm
@@ -0,0 +1,10 @@
+;; From sunterlib
+
+(define (with-lock lock thunk)
+  (dynamic-wind
+   (lambda ()
+     (obtain-lock lock))
+   thunk
+   (lambda ()
+     (release-lock lock))))
+