This commit was manufactured by cvs2svn to create branch 'init'.

[helm.git] / helm / hbugs / common / threadSafe.ml

diff --git a/helm/hbugs/common/threadSafe.ml b/helm/hbugs/common/threadSafe.ml
deleted file mode 100644 (file)
index c09301d..0000000
--- a/helm/hbugs/common/threadSafe.ml
+++ /dev/null
@@ -1,96 +0,0 @@
-(*
- * 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/
- *)
-
-let debug_print = let debug = false in fun s -> if debug then prerr_endline s;;
-
-class threadSafe =
-  object (self)
-
-    val mutex = Mutex.create ()
-
-      (** condition variable: 'no readers is currently reading' *)
-    val noReaders = Condition.create ()
-
-      (** readers count *)
-    val mutable readersCount = 0
-
-    method private incrReadersCount = (* internal, not exported *)
-      self#doCritical (lazy (
-        readersCount <- readersCount + 1
-      ))
-
-    method private decrReadersCount = (* internal, not exported *)
-      self#doCritical (lazy (
-        if readersCount > 0 then readersCount <- readersCount - 1;
-      ))
-
-    method private signalNoReaders =  (* internal, not exported *)
-      self#doCritical (lazy (
-        if readersCount = 0 then Condition.signal noReaders
-      ))
-
-    method private doCritical: 'a. 'a lazy_t -> 'a =
-      fun action ->
-        debug_print "<doCritical>";
-        (try
-          Mutex.lock mutex;
-          let res = Lazy.force action in
-          Mutex.unlock mutex;
-          debug_print "</doCritical>";
-          res
-        with e ->
-          Mutex.unlock mutex;
-          raise e);
-
-    method private doReader: 'a. 'a lazy_t -> 'a =
-      fun action ->
-        debug_print "<doReader>";
-        let cleanup () =
-          self#decrReadersCount;
-          self#signalNoReaders
-        in
-        self#incrReadersCount;
-        let res = (try Lazy.force action with e -> (cleanup (); raise e)) in
-        cleanup ();
-        debug_print "</doReader>";
-        res
-
-      (* TODO may starve!!!! is what we want or not? *)
-    method private doWriter: 'a. 'a lazy_t -> 'a =
-      fun action ->
-        debug_print "<doWriter>";
-        self#doCritical (lazy (
-          while readersCount > 0 do
-            Condition.wait noReaders mutex
-          done;
-          let res = Lazy.force action in
-          debug_print "</doWriter>";
-          res
-        ))
-
-  end