module Lwt_pool: sig..end
Creating pools (for example pools of connections to a database).
Instead of creating a new connection each time you need one, keep a pool of opened connections and reuse opened connections that are free.
type 'a t
Type of pools
create n f creates a new pool with at most n members.
f is the function to use to create a new pool member.
use p f takes one free member of the pool p and gives it to the function