Mastering Rust - Second Edition

RwLock

While Mutex is fine for most use cases, for some multi-threaded scenarios, reads happen more often than writes from multiple threads. In that case, we can use the RwLock type, which also provides shared mutability but can do so at a more granular level. RwLock stands for Reader-Writer lock. With RwLock, we can have many readers at the same but only one writer in a given scope. This is much better than a Mutex which agnostic of the kind of access a thread wants. Using RwLock

RwLock exposes two methods:

• read: Gives read access to the thread. There can be many read invocations.
• write: Gives exclusive access to thread for writing data to the wrapped type. There can be one write access from an RwLock instance to a thread.

Here's a sample ...