module Lwt_mvar : sig..end
"Mailbox" variables implement a synchronising variable, used for communication between concurrent threads.
type 'a t
The type of a mailbox variable. Mailbox variables are used to communicate values between threads in a synchronous way. The type parameter specifies the type of the value propagated from put to take.
val create : 'a -> 'a t
create v creates a new mailbox variable containing value v.
val create_empty : unit -> 'a t
create () creates a new empty mailbox variable.
put mvar value puts a value into a mailbox variable. This value will remain in the mailbox until take is called to remove it. If the mailbox is not empty, the current thread will block until it is emptied.
take mvar will take any currently available value from the mailbox variable. If no value is currently available, the current thread will block, awaiting a value to be put by another thread.
val take_available : 'a t -> 'a option
take_available mvar immediately takes the value from mvar without
blocking, returning None if the mailbox is empty.
val is_empty : 'a t -> bool
is_empty mvar indicates if put mvar can be called without blocking.