type key = H.t
val create : rate:int -> max:int -> n:int -> t
Creates a rate limiter.
Lwt_throttle.wait limiter channel returns a new promise associated with the given rate limiter and channel.
If the maximum number of pending promises for
limiter has not been reached, the promise starts pending. It will be resolved with
true at some future time, such that the rate limit of
limiter is not exceeded, with respect to other promises in the same
If the maximum number of pending promises has been reached, the returned promise is already resolved with