package eio

  1. Overview
  2. Docs
Effect-based direct-style IO API for OCaml

Install 

dune-project
 Dependency

github.com Edit opam file Versions (20)

Authors

  1. A
    Anil Madhavapeddy
  2. T
    Thomas Leonard

Maintainers

  1. A
    anil@recoil.org

Sources

eio-1.4.tbz
sha256=ba11ad486f492130dbb486f2b3bdc4905643f10016806ddf86e9a34e4346aaa5
sha512=57ef2c137ccdc26d8029e636b6a4ee92da7c6b2f35954946bd56ca595d6947a8ec42f6f83f8552f73d6719e6ce2314cae2e2fad1686a387522935e6f90e9a8d9

doc/src/eio.core/single_waiter.ml.html

Source file single_waiter.ml

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type 'a state =
  | Running
  | Sleeping of (('a, exn) result -> unit)

type 'a t = 'a state ref

let create () = ref Running

let wake t v =
  match !t with
  | Running -> false
  | Sleeping fn ->
    t := Running;
    fn v;
    true

let wake_if_sleeping t =
  ignore (wake t (Ok ()) : bool)

let await t op id =
  let x =
    Suspend.enter op @@ fun ctx enqueue ->
    Cancel.Fiber_context.set_cancel_fn ctx (fun ex ->
        t := Running;
        enqueue (Error ex)
      );
    t := Sleeping (fun x ->
        Cancel.Fiber_context.clear_cancel_fn ctx;
        t := Running;
        enqueue x
      )
  in
  Trace.get id;
  x

let await_protect t op id =
  let x =
    Suspend.enter_unchecked op @@ fun _ctx enqueue ->
    t := Sleeping (fun x -> t := Running; enqueue x)
  in
  Trace.get id;
  x