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.