1 (***********************************************************************)
5 (* Xavier Leroy and Damien Doligez, INRIA Rocquencourt *)
7 (* Copyright 1996 Institut National de Recherche en Informatique et *)
8 (* en Automatique. All rights reserved. This file is distributed *)
9 (* under the terms of the GNU Library General Public License, with *)
10 (* the special exception on linking described in file ../../LICENSE. *)
12 (***********************************************************************)
14 (* $Id: mutex.ml 4144 2001-12-07 13:41:02Z xleroy $ *)
16 type t = { mutable locked: bool; mutable waiting: Thread.t list }
18 let create () = { locked = false; waiting = [] }
21 if m.locked then begin (* test and set atomic *)
22 Thread.critical_section := true;
23 m.waiting <- Thread.self() :: m.waiting;
27 m.locked <- true (* test and set atomic *)
30 let try_lock m = (* test and set atomic *)
31 if m.locked then false else begin m.locked <- true; true end
34 (* Don't play with Thread.critical_section here because of Condition.wait *)
35 let w = m.waiting in (* atomic *)
36 m.waiting <- []; (* atomic *)
37 m.locked <- false; (* atomic *)
38 List.iter Thread.wakeup w