Module `Lock_file_blocking.Mkdir`

This is the dumbest lock imaginable: we mkdir to lock and rmdir to unlock. This gives you pretty good mutual exclusion, but it makes you vulnerable to stale locks.

type t

val lock_exn : lock_path:string -> [ `We_took_it of t | `Somebody_else_took_it ]: Raises an exception if the mkdir system call fails for any reason other than EEXIST.

val unlock_exn : t -> unit: Raises an exception if the rmdir system call fails.