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diff --git a/helm/ocaml/thread/threadSafe.mli b/helm/ocaml/thread/threadSafe.mli
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+(*
+ * Copyright (C) 2003-2004:
+ *    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/
+ *)
+
+class threadSafe:
+  object
+
+      (** execute 'action' in mutual exclusion between all other threads *)
+    method private doCritical: 'a. 'a lazy_t -> 'a
+
+      (** execute 'action' acting as a 'reader' i.e.: multiple readers can act
+      at the same time but no writer can act until no readers are acting *)
+    method private doReader: 'a. 'a lazy_t -> 'a
+
+      (** execute 'action' acting as a 'writer' i.e.: when a writer is acting,
+      no readers or writer can act, beware that writers can starve *)
+    method private doWriter: 'a. 'a lazy_t -> 'a
+
+  end
+