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(* ========================================================================= *)
(* MLTON SPECIFIC FUNCTIONS *)
(* Copyright (c) 2002 Joe Leslie-Hurd, distributed under the BSD License *)
(* ========================================================================= *)
structure Portable :> Portable =
struct
(* ------------------------------------------------------------------------- *)
(* The ML implementation. *)
(* ------------------------------------------------------------------------- *)
val ml = "mlton";
(* ------------------------------------------------------------------------- *)
(* Pointer equality using the run-time system. *)
(* ------------------------------------------------------------------------- *)
val pointerEqual = MLton.eq;
(* ------------------------------------------------------------------------- *)
(* Marking critical sections of code. *)
(* ------------------------------------------------------------------------- *)
fun critical f () = f ();
(* ------------------------------------------------------------------------- *)
(* Generating random values. *)
(* ------------------------------------------------------------------------- *)
fun randomWord () = MLton.Random.rand ();
fun randomBool () = Word.andb (randomWord (),0w1) = 0w0;
fun randomInt 1 = 0
| randomInt 2 = Word.toInt (Word.andb (randomWord (), 0w1))
| randomInt 4 = Word.toInt (Word.andb (randomWord (), 0w3))
| randomInt n = Word.toInt (Word.mod (randomWord (), Word.fromInt n));
local
fun wordToReal w = Real.fromInt (Word.toInt (Word.>> (w,0w1)))
val normalizer = 1.0 / wordToReal (Word.notb 0w0);
in
fun randomReal () = normalizer * wordToReal (randomWord ());
end;
(* ------------------------------------------------------------------------- *)
(* Timing function applications. *)
(* ------------------------------------------------------------------------- *)
fun time f x =
let
fun p t =
let
val s = Time.fmt 3 t
in
case size (List.last (String.fields (fn x => x = #".") s)) of
3 => s
| 2 => s ^ "0"
| 1 => s ^ "00"
| _ => raise Fail "Portable.time"
end
val c = Timer.startCPUTimer ()
val r = Timer.startRealTimer ()
fun pt () =
let
val {usr,sys} = Timer.checkCPUTimer c
val real = Timer.checkRealTimer r
in
print
("User: " ^ p usr ^ " System: " ^ p sys ^
" Real: " ^ p real ^ "\n")
end
val y = f x handle e => (pt (); raise e)
val () = pt ()
in
y
end;
end
(* ------------------------------------------------------------------------- *)
(* Quotations a la Moscow ML. *)
(* ------------------------------------------------------------------------- *)
datatype 'a frag = QUOTE of string | ANTIQUOTE of 'a;
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