Rust: What is the difference between Mutex and RwLock?

Mutex — exclusive lock. RwLock — shared/exclusive.

Mutex:

• Only one thread at a time.
• Simpler.
• Good for write-heavy.

RwLock:

• Multiple readers OR one writer.
• More complex.
• Good for read-heavy.

1use std::sync::{Mutex, RwLock};
2
3let m = Mutex::new(5);
4*m.lock().unwrap() = 10;
5
6let rw = RwLock::new(5);
7let r = rw.read().unwrap();
8let mut w = rw.write().unwrap();
9*w = 10;

Key: Mutex for exclusive access, RwLock for read-heavy.