How to solve ABA problem in Rust (Hazard Pointers)

Can an Read more problem occur in Rust? The reason I'm asking this question is because of Rust's Fearless Concurrency quote which I came across. If yes, how to solve this kind of problem in Rust. Do we have Hazard Pointers in Rust?

Answer

The ABA problem in concurrent programming occurs when a shared variable changes from A → B → A, making it appear unchanged to a thread performing a compare-and-swap (CAS) operation. This can lead to unintended behavior because the underlying object at address A may no longer be the same.

In Rust, solving the ABA problem often involves techniques like:

Tagged Pointers with Versioning: Each pointer is paired with a version number, ensuring that even if the same memory address is reused, outdated versions are detected.

Epoch-Based Reclamation: This method tracks memory usage across threads and prevents premature deallocation.

Hazard Pointers: A safe memory reclamation technique that ensures a thread accessing a shared object is aware of potential modifications