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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
type 'a swap_chan = ('a * 'a channel) channel
let swap msg_out ch =
guard (fun () ->
let ic = new_channel() in
choose [
wrap (receive ch) (fun (msg_in, oc) -> sync (send oc msg_out); msg_in);
wrap (send ch (msg_out, ic)) (fun () -> sync (receive ic))
])
let ch = new_channel()
let f () =
let res = sync (swap "F" ch) in
print_string "f "; print_string res; print_newline()
let g () =
let res = sync (swap "G" ch) in
print_string "g "; print_string res; print_newline()
let _ =
let id = Thread.create f () in
g ();
Thread.join id
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