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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
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,
because every read would have to wait for the lock to be released.\
This is known as **coarse-grained locking**.