Rust: What is the difference between mpsc and broadcast channels?

mpsc — multiple producer, single consumer. broadcast — multiple producer, multiple consumer.

mpsc:

• One receiver.
• Message consumed once.
• For task communication.

broadcast:

• Multiple receivers.
• Each gets all messages.
• For event broadcasting.

1use tokio::sync::broadcast;
2
3let (tx, _) = broadcast::channel(16);
4tx.send("hello").unwrap();
5
6let mut rx1 = tx.subscribe();
7let mut rx2 = tx.subscribe();

Key: broadcast for fan-out, mpsc for task-to-task.