Module Stdune.Fcntl

type lock_type =
| Read
| Write
type whence =
| Set
| Cur
| End
val lock : ?⁠whence:whence -> ?⁠start:int -> ?⁠len:int -> Unix.file_descr -> lock_type -> unit
val lock_try : ?⁠whence:whence -> ?⁠start:int -> ?⁠len:int -> Unix.file_descr -> lock_type -> bool
val lock_get : ?⁠whence:whence -> ?⁠start:int -> ?⁠len:int -> Unix.file_descr -> lock_type -> (lock_type * int) option
val unlock : ?⁠whence:whence -> ?⁠start:int -> ?⁠len:int -> Unix.file_descr -> unit