Rust: What is the difference between sync::oneshot and tokio::sync::oneshot?

1// Blocking
2use std::sync::mpsc;
3let (tx, rx) = mpsc::channel();
4tx.send("hello").unwrap();
5
6// Async
7use tokio::sync::oneshot;
8let (tx, rx) = oneshot::channel();
9tx.send("hello").unwrap();
10let val = rx.await.unwrap();