An async reader-writer lock.
This type of lock allows multiple readers or one writer at any point in time.
The locking strategy is write-preferring, which means writers are never starved.
Releasing a write lock wakes the next blocked reader and the next blocked writer. If the task scheduler is fair, readers will not be starved either.
use async_rwlock::RwLock;
let lock = RwLock::new(5);
// Multiple read locks can be held at a time.
let r1 = lock.read().await;
let r2 = lock.read().await;
assert_eq!(*r1, 5);
assert_eq!(*r2, 5);
drop((r1, r2));
// Only one write lock can be held at a time.
let mut w = lock.write().await;
*w += 1;
assert_eq!(*w, 6);Licensed under either of
- Apache License, Version 2.0 (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
- MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)
at your option.
Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.