sig
type t
external make : unit -> Exchanger.t = "ocamljava_exchanger_make"
external exchange : Exchanger.t -> 'a -> 'a
= "ocamljava_exchanger_exchange"
external exchange_time : Exchanger.t -> 'a -> int64 -> TimeUnit.t -> 'a
= "ocamljava_exchanger_exchange_time"
end