module CCSemaphore: sig .. end
Semaphores
Since 0.13
type
A semaphore
val create : int -> t
create n creates a semaphore with initial value n
Raises Invalid_argument if n <= 0
val get : t -> int
Current value
val acquire : int -> t -> unit
acquire n s blocks until get s >= n, then atomically
sets s := !s - n
val release : int -> t -> unit
release n s atomically sets s := !s + n
val with_acquire : n:int -> t -> f:(unit -> 'a) -> 'a
with_acquire ~n s ~f first acquires s with n units,
calls f (), and then release s with n units.
Safely release the semaphore even if f () fails
val wait_until_at_least : n:int -> t -> f:(unit -> 'a) -> 'a
wait_until_at_least ~n s ~f waits until get s >= n, then calls f ()
and returns its result. Doesn't modify the semaphore.