run init-executables-completion-set! in a seperate thread

scheme/nuit-engine.scm

@@ -7,6 +7,12 @@
 	 (begin ?do-this ... (values))
 	 (values)))))
 
+(define (with-lock lock thunk)
+  (obtain-lock lock)
+  (let ((val (thunk)))
+    (release-lock lock)
+    val))
+
 ;;This is the "heart" of NUIT.
 ;;In a central loop the program waits for input (with wgetch).
 ;;In the upper buffer simply the functionalities of scsh-ncurses:
@@ -42,6 +48,7 @@
 (define result-window #f)
 (define result-frame-window #f)
 
+(define executable-completions-lock (make-lock))
 (define executable-completions #f)
 
 (define key-control-x 24)
@@ -475,8 +482,12 @@
     '("/usr/bin" "/bin" "/usr/sbin" "/sbin"))))
 
 (define (init-executables-completion-set!)
-  (set! executable-completions 
+  (spawn
-	(make-completion-set-for-executables (get-path-list))))
+   (lambda ()
+     (with-lock executable-completions-lock
+       (lambda()
+	 (set! executable-completions 
+	       (make-completion-set-for-executables (get-path-list))))))))
 
 (define (paint-bar-1)
   (mvwaddstr (app-window-curses-win bar-1) 0 1 "SCSH-NUIT")
@@ -828,7 +839,9 @@
    (else
     (append
      (completions-for (command-completions) prefix)
-     (completions-for-executables executable-completions prefix)))))
+     (with-lock executable-completions-lock
+       (lambda ()
+	 (completions-for-executables executable-completions prefix)))))))
 
 (define (assemble-line-with-completion command arg arg-pos completion)
   (debug-message "assemble-line-with-completion "