regression/world2.sml

   1 fun run (f: unit -> unit) =
   2    case Posix.Process.fork () of
   3       SOME pid =>
   4          let
   5             open Posix.Process
   6             val (pid', status) = waitpid (W_CHILD pid, [])
   7          in if pid = pid' andalso status = W_EXITED
   8                then ()
   9             else raise Fail "child failed"
  10          end
  11     | NONE => let open OS.Process
  12               in exit ((f (); success) handle _ => failure)
  13               end
  14
  15 fun succeed () =
  16    let open OS.Process
  17    in exit success
  18    end
  19
  20 open MLton.World
  21
  22 val (w, out) = MLton.TextIO.mkstemp "/tmp/world"
  23 val _ = TextIO.closeOut out
  24
  25 val a = Array.array (10000, 17)
  26
  27 val _ =
  28     case save w of
  29        Original => ()
  30      | Clone => (Array.update (a, 0, 13)
  31                  ; print (concat [Int.toString (Array.sub (a, 0) + Array.sub (a, 1)),
  32                                 "\n"])
  33                  ; succeed ())
  34
  35 val _ = run (fn () => load w)
  36
  37 val _ = OS.FileSys.remove w