Channels

Channel functionality is limited in the standard library. For multiple-producer multiple-consumer channels and other concurrent utilities, check out the crossbeam crate.

Rust channels have two parts: a Sender<T> and a Receiver<T>. The two parts are connected via the channel, but you only see the end-points.

use std::sync::mpsc;

fn main() {
    let (tx, rx) = mpsc::channel();

    tx.send(10).unwrap();
    tx.send(20).unwrap();

    println!("Received: {:?}", rx.recv());
    println!("Received: {:?}", rx.recv());

    let tx2 = tx.clone();
    tx2.send(30).unwrap();
    println!("Received: {:?}", rx.recv());
}

mpsc stands for Multi-Producer, Single-Consumer. Sender and SyncSender implement Clone (so you can make multiple producers) but Receiver does not.
send() and recv() return Result. If they return Err, it means the counterpart Sender or Receiver is dropped and the channel is closed.

Comprehensive Rust 🦀

Channels