2 * Copyright (C) 2003-2004:
3 * Stefano Zacchiroli <zack@cs.unibo.it>
4 * for the HELM Team http://helm.cs.unibo.it/
6 * This file is part of HELM, an Hypertextual, Electronic
7 * Library of Mathematics, developed at the Computer Science
8 * Department, University of Bologna, Italy.
10 * HELM is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version 2
13 * of the License, or (at your option) any later version.
15 * HELM is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with HELM; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston,
25 * For details, see the HELM World-Wide-Web page,
26 * http://helm.cs.unibo.it/
32 (** execute 'action' in mutual exclusion between all other threads *)
33 method private doCritical: 'a. 'a lazy_t -> 'a
35 (** execute 'action' acting as a 'reader' i.e.: multiple readers can act
36 at the same time but no writer can act until no readers are acting *)
37 method private doReader: 'a. 'a lazy_t -> 'a
39 (** execute 'action' acting as a 'writer' i.e.: when a writer is acting,
40 no readers or writer can act, beware that writers can starve *)
41 method private doWriter: 'a. 'a lazy_t -> 'a