3 OCaml HTTP - do it yourself (fully OCaml) HTTP daemon
5 Copyright (C) <2002-2004> Stefano Zacchiroli <zack@cs.unibo.it>
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 let m = Mutex.create ()
25 let m_locked = ref true
34 (** ocaml's Thread.unlock suspend the invoking process if the mutex is already
35 * unlocked, therefore we unlock it only if we know that it's currently locked
37 let safe_unlock _ _ = if !m_locked then Mutex.unlock m
41 Http_daemon.respond ~body:(Printf.sprintf "i = %d\n" !i) outchan
43 let callback req outchan =
45 | "/incr" -> critical (lazy (incr i; dump_i outchan; Unix.sleep 5))
46 | "/decr" -> critical (lazy (decr i; dump_i outchan; Unix.sleep 5))
47 | "/get" -> critical (lazy (dump_i outchan))
48 | bad_request -> Http_daemon.respond_error outchan
51 { Http_daemon.default_spec with
55 exn_handler = Some safe_unlock;
56 (** ocaml-http's default exn_handler is Pervasives.ignore. This means
57 * that threads holding the "m" mutex above may die without unlocking it.
58 * Using safe_unlock as an exception handler we ensure that "m" mutex is
59 * unlocked in case of exceptions (e.g. SIGPIPE) *)
62 let _ = Http_daemon.main spec