[Caml-list] Beginner's question on Lwt usage

[Raphael Bauduin <rblists@gmail.com>]

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Hi,

After writing a small tcp server in ocaml, I wanted to make it work
asynchronously with Lwt.
I changed the function handling the accept on the socket to look like this:

let rec accept_connection sock:Unix.file_descr =
  let socket_thread = Lwt.return ( Unix.accept sock ) in
  let _ = Lwt.bind socket_thread
         ( fun (fd, caller) ->
             ignore(Lwt_io.printf "accepted\n%!");
             (*let _ = set_nonblock fd in*)
             Lwt.return (readall fd) >>= fun a ->
                 ignore(Lwt_io.printf "%s\n%!" a);
                 ignore(Lwt.async (fun () -> Lwt.return (close fd) ) );
                 Lwt.return 0;
         ); in
   accept_connection sock

The complete code is at http://pastie.org/10971189 .

But it doesn't seem to work. The problems are:
- nothing is printed on stdout
- when I open 2 connections, the second can only be closed after the first
has been closed.

In the mean time I've discovered Lwt_unix, but before looking at it, I'd
like to understand what's wrong in my current code. Can you spot errors in
the code? General advice is also welcome!

Thanks

Raphael

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