package eio

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

Install 

dune-project
 Dependency

github.com Readme Changelog ISC License Edit opam file Versions (21)

Authors

  1. A
    Anil Madhavapeddy
  2. T
    Thomas Leonard

Maintainers

  1. A
    anil@recoil.org

Sources

eio-1.5.tbz
sha256=7d70d1f5fb2b7190bf1ab28fffeb272da51ffe6d6c9c7c94e0485fabdf3b3fda
sha512=4582ac2fb2f8616b3d8ae9670eb7913a78085899b14044408801b30a34fed6c4d32971ba72eedb0cbc3d82c057610cf81c482090e75e2985330fcde96478ac5e

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