Rust: What is the difference between tokio::sync::mpsc and std::sync::mpsc?

tokio::sync::mpsc — async channel. std::sync::mpsc — blocking channel.

tokio::sync::mpsc:

• Async send/recv.
• Non-blocking.
• For async code.

std::sync::mpsc:

• Blocking send/recv.
• Can block thread.
• For sync code.

1use tokio::sync::mpsc;
2
3let (tx, mut rx) = mpsc::channel(32);
4tx.send("hello").await.unwrap();
5let msg = rx.recv().await.unwrap();
6
7use std::sync::mpsc;
8let (tx, rx) = mpsc::channel();
9tx.send("hello").unwrap();
10let msg = rx.recv().unwrap();

Key: tokio for async, std for blocking.