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Concurrency · medium

32. Mutex, RwLock and Arc

Sharing mutable state safely.

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`Arc<T>` shares ownership atomically across threads. `Mutex<T>` grants exclusive access via a guard released on drop; `RwLock<T>` allows many readers or one writer. Lock poisoning surfaces a panic that occurred while a lock was held.

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Check your understanding

  1. 1. Which pairs with Mutex across threads?

  2. 2. A Mutex guard unlocks when…

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