Mutex

Recovering Safely from Poisoned Mutexes in Rust

A mutex protects shared data from concurrent access, but mutual exclusion alone does not guarantee that the data remains valid. A thread can panic halfway through a multi-step update and release the lock during unwinding, leaving the protected value in a state that other threads should not blindly trust. Rust’s standard Mutex records this situation through poisoning. A poisoned mutex is still lockable, but acquiring it returns an error that forces the caller to decide whether continuing is appropriate.