Module Lwt_util

module Lwt_util: sig..end

Concurrency ¶

val join : unit Lwt.t list -> unit Lwt.t

join l wait for all threads in l to terminate. If fails if one of the threads fail.

Lists iterators ¶

val iter : ('a -> unit Lwt.t) -> 'a list -> unit Lwt.t

iter f l start a thread for each element in l. The threads are started according to the list order, but then can run concurrently. It terminates when all the threads are terminated, if all threads are successful. It fails if any of the threads fail.

val iter_serial : ('a -> unit Lwt.t) -> 'a list -> unit Lwt.t

Similar to iter but wait for one thread to terminate before starting the next one.

val map : ('a -> 'b Lwt.t) -> 'a list -> 'b list Lwt.t

map f l apply f to each element in l and collect the results of the threads thus created. The threads are started according to the list order, but then can run concurrently. map f l fails if any of the threads fail.

val map_with_waiting_action : ('a -> 'b Lwt.t) -> ('a -> unit) -> 'a list -> 'b list Lwt.t

map_with_waiting_action f wa l apply f to each element in l and collect the results of the threads thus created. The threads are started according to the list order, but then can run concurrently. The difference with map f l is that function wa will be called on the element that the function is waiting for its termination.

val map_serial : ('a -> 'b Lwt.t) -> 'a list -> 'b list Lwt.t

Similar to map but wait for one thread to terminate before starting the next one.

val fold_left : ('a -> 'b -> 'a Lwt.t) -> 'a -> 'b list -> 'a Lwt.t

Similar to List.fold_left.

Regions ¶

type region

val make_region : int -> region

make_region sz create a region of size sz.

val resize_region : region -> int -> unit

resize_region reg sz resize the region reg to size sz.

val run_in_region : region -> int -> (unit -> 'a Lwt.t) -> 'a Lwt.t

run_in_region reg size f execute the thread produced by the function f in the region reg. The thread is not started before some room is available in the region.