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fix a small typo in 11_locks.md (#219)
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book/src/07_threads/11_locks.md
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@ -58,7 +58,7 @@ drop(guard)
## Locking granularity ## Locking granularity
What should our `Mutex` wrap?\ What should our `Mutex` wrap?\
The simplest option would be the wrap the entire `TicketStore` in a single `Mutex`.\ The simplest option would be to wrap the entire `TicketStore` in a single `Mutex`.\
This would work, but it would severely limit the system's performance: you wouldn't be able to read tickets in parallel, This would work, but it would severely limit the system's performance: you wouldn't be able to read tickets in parallel,
because every read would have to wait for the lock to be released.\ because every read would have to wait for the lock to be released.\
This is known as **coarse-grained locking**. This is known as **coarse-grained locking**.