ArcSwap

The Rust's [Arc] can be used from multiple threads and the count is safely updated as needed. However, the [Arc] itself can't be atomically replaced. To do that, one needs to place it under a lock.

On the other hand, [AtomicPtr] can be replaced atomically, but it's hard to know when the target can be safely freed.

This is a cross-breed between the two ‒ an [ArcSwap] can be seeded with an [Arc] and the [Arc] can be simultaneously replaced and read by multiple threads without any locking.

License

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.

Contribution

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.