single-threaded profiling;

--- a/src/Pure/ML-Systems/polyml-5.1.ML	Thu Oct 04 21:10:41 2007 +0200
+++ b/src/Pure/ML-Systems/polyml-5.1.ML	Thu Oct 04 21:11:06 2007 +0200
@@ -10,6 +10,16 @@
 val pointer_eq = PolyML.pointerEq;
 
 
+(* single-threaded profiling *)
+
+local val profile_orig = profile in
+
+fun profile 0 f x = f x
+  | profile n f x = NAMED_CRITICAL "profile" (fn () => profile_orig n f x);
+
+end;
+
+
 (* improved versions of use_text/file *)
 
 fun use_text (tune: string -> string) name (print, err) verbose txt =