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[helm.git] / helm / hbugs / tutors / hbugs_deity.ml

diff --git a/helm/hbugs/tutors/hbugs_deity.ml b/helm/hbugs/tutors/hbugs_deity.ml
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-(*
- * Copyright (C) 2003:
- *    Stefano Zacchiroli <zack@cs.unibo.it>
- *    for the HELM Team http://helm.cs.unibo.it/
- *
- *  This file is part of HELM, an Hypertextual, Electronic
- *  Library of Mathematics, developed at the Computer Science
- *  Department, University of Bologna, Italy.
- *
- *  HELM is free software; you can redistribute it and/or
- *  modify it under the terms of the GNU General Public License
- *  as published by the Free Software Foundation; either version 2
- *  of the License, or (at your option) any later version.
- *
- *  HELM is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with HELM; if not, write to the Free Software
- *  Foundation, Inc., 59 Temple Place - Suite 330, Boston,
- *  MA  02111-1307, USA.
- *
- *  For details, see the HELM World-Wide-Web page,
- *  http://helm.cs.unibo.it/
- *)
-
-exception Can_t_kill of int * string ;; (* pid, reason *)
-
- (* perform an action inside a critical section controlled by given mutex *)
-let do_critical mutex =
-  fun action ->
-    try
-      Mutex.lock mutex;
-      let res = Lazy.force action in
-      Mutex.unlock mutex;
-      res 
-    with e -> Mutex.unlock mutex; raise e
-;;
-
-let kill_signal = Sys.sigusr2 ;;    (* signal used to kill children *)
-let chan = Event.new_channel () ;;  (* communication channel between threads *)
-
-  (* functions mangling "must die" PID list *)
-let (add_to_dead_threads_walking, remove_from_dead_threads_walking, must_die) =
-  let dead_threads_walking = ref [] in
-  let mutex = Mutex.create () in
-  let add pid = do_critical mutex (lazy (
-      dead_threads_walking := pid :: !dead_threads_walking;
-  )) in
-  let remove pid = do_critical mutex (lazy (
-      dead_threads_walking := List.filter ((<>) pid) !dead_threads_walking
-  )) in
-  let is_in pid = do_critical mutex (lazy (
-      List.exists ((=) pid) !dead_threads_walking
-  )) in
-  (add, remove, is_in)
-;;
-
-  (* "kill_signal" handler, check if current process must die, if this is the
-  case exits with Thread.exit *)
-ignore (Sys.signal kill_signal (Sys.Signal_handle
-  (fun signal ->
-    let myself = Unix.getpid () in
-    match signal with
-    | sg when (sg = kill_signal) && (must_die myself) ->
-        remove_from_dead_threads_walking myself;
-        prerr_endline "AYEEEEH!";
-        Thread.exit ()
-    | _ -> ())))
-;;
-
-  (* given a thread body (i.e. first argument of a Thread.create invocation)
-  return a new thread body which unblock the kill signal and send its pid to
-  parent over "chan" *)
-let wrap_thread body =
-  fun arg ->
-    ignore (Unix.sigprocmask Unix.SIG_UNBLOCK [ kill_signal ]);
-    Event.sync (Event.send chan (Unix.getpid ()));
-    body arg
-;;
-
-let creation_mutex = Mutex.create () ;;
-
-let create body arg =
-  do_critical creation_mutex (lazy (
-      ignore (Thread.create (wrap_thread body) arg);
-      Event.sync (Event.receive chan)
-  ))
-;;
-let kill pid =
-  add_to_dead_threads_walking pid;
-  try
-    Unix.kill pid kill_signal
-  with e -> raise (Can_t_kill (pid, Printexc.to_string e))
-;;
-
-  (* block kill signal in main process *)
-ignore (Unix.sigprocmask Unix.SIG_BLOCK [ kill_signal ]) ;;
-