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Clarify the immutability of a reference #2646

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Mar 19, 2021
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Clarify the immutability of a reference #2646

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6 changes: 3 additions & 3 deletions src/ch16-04-extensible-concurrency-sync-and-send.md
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Expand Up @@ -33,9 +33,9 @@ we’ll discuss in Chapter 19.

The `Sync` marker trait indicates that it is safe for the type implementing
`Sync` to be referenced from multiple threads. In other words, any type `T` is
`Sync` if `&T` (a reference to `T`) is `Send`, meaning the reference can be
sent safely to another thread. Similar to `Send`, primitive types are `Sync`,
and types composed entirely of types that are `Sync` are also `Sync`.
`Sync` if `&T` (an immutable reference to `T`) is `Send`, meaning the reference
can be sent safely to another thread. Similar to `Send`, primitive types are
`Sync`, and types composed entirely of types that are `Sync` are also `Sync`.

The smart pointer `Rc<T>` is also not `Sync` for the same reasons that it’s not
`Send`. The `RefCell<T>` type (which we talked about in Chapter 15) and the
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