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https://github.com/c-cube/moonpool.git
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092ad5f2ce
one can now give tasks an optional string "name". If `Trace` is present (installed) and enabled, this results in a span around the task's execution. This also plays ok with `await` and other effect-based primitives.
62 lines
1.6 KiB
OCaml
62 lines
1.6 KiB
OCaml
type suspension = (unit, exn * Printexc.raw_backtrace) result -> unit
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type task = unit -> unit
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type suspension_handler = {
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handle: name:string -> run:(name:string -> task -> unit) -> suspension -> unit;
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}
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[@@unboxed]
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[@@@ifge 5.0]
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[@@@ocaml.alert "-unstable"]
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module A = Atomic_
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type _ Effect.t += Suspend : suspension_handler -> unit Effect.t
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let[@inline] suspend h = Effect.perform (Suspend h)
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let with_suspend ~name ~on_suspend ~(run : name:string -> task -> unit)
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(f : unit -> unit) : unit =
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let module E = Effect.Deep in
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(* effect handler *)
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let effc : type e. e Effect.t -> ((e, _) E.continuation -> _) option =
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function
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| Suspend h ->
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Some
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(fun k ->
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on_suspend ();
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let k' : suspension = function
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| Ok () -> E.continue k ()
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| Error (exn, bt) -> E.discontinue_with_backtrace k exn bt
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in
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h.handle ~name ~run k')
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| _ -> None
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in
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E.try_with f () { E.effc }
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(* DLA interop *)
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let prepare_for_await () : Dla_.t =
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(* current state *)
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let st : (string * (name:string -> task -> unit) * suspension) option A.t =
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A.make None
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in
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let release () : unit =
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match A.exchange st None with
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| None -> ()
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| Some (name, run, k) -> run ~name (fun () -> k (Ok ()))
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and await () : unit =
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suspend { handle = (fun ~name ~run k -> A.set st (Some (name, run, k))) }
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in
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let t = { Dla_.release; await } in
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t
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[@@@ocaml.alert "+unstable"]
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[@@@else_]
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let[@inline] with_suspend ~run:_ f = f ()
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let[@inline] prepare_for_await () = { Dla_.release = ignore; await = ignore }
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[@@@endif]
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