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feat fut: add on_result_ignore

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Simon Cruanes 2024-08-28 12:49:29 -04:00
parent 6b81d1fca9
commit e1105f4a88
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GPG key ID: EBFFF6F283F3A2B4
2 changed files with 22 additions and 3 deletions
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18
src/core/fut.ml
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@ -69,6 +69,18 @@ let on_result (self : _ t) (f : _ waiter) : unit =
in
ignore (C.try_attach self.st trigger : bool)
let on_result_ignore_cb_ _tr f (self : _ t) =
f (Picos.Computation.canceled self.st)
let on_result_ignore (self : _ t) f : unit =
if Picos.Computation.is_running self.st then (
let trigger =
(Trigger.from_action f self on_result_ignore_cb_ [@alert "-handler"])
in
ignore (C.try_attach self.st trigger : bool)
) else
on_result_ignore_cb_ () f self
let[@inline] fulfill_idempotent self r =
match r with
| Ok x -> C.return self.st x
@ -296,14 +308,14 @@ let barrier_on_abstract_container_of_futures ~iter ~len ~aggregate_results cont
(* callback called when a future in [a] is resolved *)
let on_res = function
| Ok _ ->
| None ->
let n = A.fetch_and_add missing (-1) in
if n = 1 then (
(* last future, we know they all succeeded, so resolve [fut] *)
let res = aggregate_results peek_or_assert_ cont in
fulfill promise (Ok res)
)
| Error e_bt ->
| Some e_bt ->
(* immediately cancel all other [on_res] *)
let n = A.exchange missing 0 in
if n > 0 then
@ -312,7 +324,7 @@ let barrier_on_abstract_container_of_futures ~iter ~len ~aggregate_results cont
fulfill promise (Error e_bt)
in
iter (fun fut -> on_result fut on_res) cont;
iter (fun fut -> on_result_ignore fut on_res) cont;
fut
)

7
src/core/fut.mli
View file

@ -34,6 +34,13 @@ val on_result : 'a t -> ('a or_error -> unit) -> unit
when [fut] is set ;
or calls [f] immediately if [fut] is already set. *)
val on_result_ignore : _ t -> (Exn_bt.t option -> unit) -> unit
(** [on_result_ignore fut f] registers [f] to be called in the future
when [fut] is set;
or calls [f] immediately if [fut] is already set.
It does not pass the result, only a success/error signal.
@since NEXT_RELEASE *)
exception Already_fulfilled
val fulfill : 'a promise -> 'a or_error -> unit