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(***********************************************************************)
(* *)
(* OCaml *)
(* *)
(* Xavier Leroy, projet Cristal, INRIA Rocquencourt *)
(* *)
(* Copyright 1996 Institut National de Recherche en Informatique et *)
(* en Automatique. All rights reserved. This file is distributed *)
(* under the terms of the Q Public License version 1.0. *)
(* *)
(***********************************************************************)
open Event
let add_ch = new_channel()
let sub_ch = new_channel()
let read_ch = new_channel()
let rec accu n =
select [
wrap (receive add_ch) (fun x -> accu (n+x));
wrap (receive sub_ch) (fun x -> accu (n-x));
wrap (send read_ch n) (fun () -> accu n)
]
let rec sender chan value =
sync(send chan value); sender chan value
let read () =
print_int(sync(receive read_ch)); print_newline()
let main () =
Thread.create accu 0;
Thread.create (sender add_ch) 1;
Thread.create (sender sub_ch) 1;
while true do read() done
let _ = Printexc.catch main ()
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