sig
type t = Mutex.t
val create : unit -> t
val equal : t -> t -> bool
val lock : t -> unit
val try_lock : t -> bool
val timedlock : (t -> Time.t -> bool) Or_error.t
val unlock : t -> unit
val am_holding_mutex : t -> bool
val critical_section : t -> f:(unit -> 'a) -> 'a
val synchronize : ('a -> 'b) -> 'a -> 'b
val update_signal : t -> Condition.t -> f:(unit -> 'a) -> 'a
val update_broadcast : t -> Condition.t -> f:(unit -> 'a) -> 'a
val ounit_tests : unit -> OUnit.test
end