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(**************************************************************************)
(* *)
(* OCaml *)
(* *)
(* Stephen Dolan, University of Cambridge *)
(* *)
(* Copyright 2017-2018 University of Cambridge. *)
(* *)
(* All rights reserved. This file is distributed under the terms of *)
(* the GNU Lesser General Public License version 2.1, with the *)
(* special exception on linking described in the file LICENSE. *)
(* *)
(**************************************************************************)
type !'a t
external make : 'a -> 'a t = "%makemutable"
external get : 'a t -> 'a = "%atomic_load"
external exchange : 'a t -> 'a -> 'a = "%atomic_exchange"
external compare_and_set : 'a t -> 'a -> 'a -> bool = "%atomic_cas"
external fetch_and_add : int t -> int -> int = "%atomic_fetch_add"
external ignore : 'a -> unit = "%ignore"
let set r x = ignore (exchange r x)
let incr r = ignore (fetch_and_add r 1)
let decr r = ignore (fetch_and_add r (-1))
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