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perf fut: use Domain_.relax in spin loops

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Simon Cruanes 2023-06-08 00:07:54 -04:00
parent f3228f87c7
commit 259fee2722
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1 changed files with 14 additions and 9 deletions
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23
src/fut.ml
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@ -39,7 +39,7 @@ let on_result (self : _ t) (f : _ waiter) : unit =
let must_retry = not (A.compare_and_set self.st st (Waiting (f :: l))) in
must_retry
do
()
Domain_.relax ()
done
exception Already_fulfilled
@ -58,7 +58,7 @@ let fulfill (self : _ t) (r : _ result) : unit =
) else
true
do
()
Domain_.relax ()
done
let[@inline] fulfill_idempotent self r =
@ -137,13 +137,18 @@ let bind ?on ~f fut : _ t =
fut2
let rec update_ (st : 'a A.t) f : 'a =
let x = A.get st in
let y = f x in
if A.compare_and_set st x y then
y
else
update_ st f
let update_ (st : 'a A.t) f : 'a =
let rec loop () =
let x = A.get st in
let y = f x in
if A.compare_and_set st x y then
y
else (
Domain_.relax ();
loop ()
)
in
loop ()
let both a b : _ t =
match peek a, peek b with