regression/world1.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 _ =
  26    case save w of
  27       Clone => (print "I am the clone\n"; succeed ())
  28     | Original => print "I am the original\n"
  29
  30 val _ = run (fn () => load w)
  31
  32 val _ = OS.FileSys.remove w
  33