package xen-evtchn

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exception Invalid
type 'a t = {
  1. generation : int;
  2. value : 'a;
}
val generation : int Pervasives.ref
val wrap : 'a -> 'a t
val maybe : 'a t -> ('a -> 'b) -> 'b -> 'b
val extract : 'a t -> 'a
val resume : unit -> unit