Feature gate: #![feature(mpsc_is_disconnected)] and #![feature(mpmc_channel)]

This is a tracking issue for the is_disconnected methods on mpsc and mpmc channels.

With these methods you'll be able to check if all Sender/Receivers on a channel have disconnected.

Public API

#![feature(mpsc_is_disconnected)]

use std::sync::mpsc::channel;

let (tx, rx) = channel::<i32>();
assert!(!tx.is_disconnected());
drop(rx);
assert!(tx.is_disconnected());

Steps / History

(Remember to update the S-tracking-* label when checking boxes.)

• ACP: Add is_disconnected() to std::sync::mpsc and std::sync::mpmc libs-team#748
• Implementation: Add is_disconnected functions to mpsc and mpmc channels #153170
• Final comment period (FCP)¹
• Stabilization PR

Unresolved Questions

• What's the best way to document this in a way that prevents people from creating race conditions.
• Will std get the ability to re-connect channels? If so what does that mean for this feature?
• Can we add a clippy feature to detect the if !tx.is_disconnected() { tx.send() } form.