Concurrent.MakeHashtbla thread safe hashtable
module Hash = Hval create : int -> 'a tval clear : 'a t -> unitval length : 'a t -> intval with_hashtable : ('a Hash.t -> 'b) -> 'a t -> 'bExecute the given function on the underlying hashtable in a critical section
val wrap_hashtable : 'a Hash.t -> 'a tPut a hashtable into a thread-safe wrapper; original hashtable must not be directly accessed.