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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. *)
(* *)
(**************************************************************************)
external ignore : 'a -> unit = "%ignore"
module Loc = struct
type 'a t = 'a atomic_loc
external get : 'a t -> 'a = "%atomic_load_loc"
external exchange : 'a t -> 'a -> 'a = "%atomic_exchange_loc"
external compare_and_set : 'a t -> 'a -> 'a -> bool = "%atomic_cas_loc"
external fetch_and_add : int t -> int -> int = "%atomic_fetch_add_loc"
let set t v =
ignore (exchange t v)
let incr t =
ignore (fetch_and_add t 1)
let decr t =
ignore (fetch_and_add t (-1))
end
type !'a t =
{ mutable contents: 'a [@atomic];
}
let make v =
{ contents = v }
external make_contended : 'a -> 'a t = "caml_atomic_make_contended"
let get t =
t.contents
let set t v =
t.contents <- v
let exchange t v =
Loc.exchange [%atomic.loc t.contents] v
let compare_and_set t old new_ =
Loc.compare_and_set [%atomic.loc t.contents] old new_
let fetch_and_add t incr =
Loc.fetch_and_add [%atomic.loc t.contents] incr
let incr t =
Loc.incr [%atomic.loc t.contents]
let decr t =
Loc.decr [%atomic.loc t.contents]
|
