#mutex Clear
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Go sync.Mutex vs sync.RWMutex
`Mutex` allows one goroutine at a time — for both reads and writes. `RWMutex` allows multiple concurrent readers OR one writer — much better when reads dominate.
Rust Arc<Mutex<T>> — Shared Mutable State
Share mutable data across threads: `Arc` for the shared ownership, `Mutex` for the synchronized access. Lock with `.lock().unwrap()`; the guard drops the lock on scope exit.