> Outlawing concurrent shared state means that every communication between two threads needs to be formatted as a "message" in whatever abstraction is in use.

> Outlawing concurrent shared state means that every communication between two threads needs to be formatted as a "message" in whatever abstraction is in use. > It's a real requirement, and Rust has little to say about it in its standard library So, I don't know much about concurrency, but you're looking for like, a Mutex, right? They're in the standard library and used all the time. https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html https://doc.rust-lang.org/stable/std/sync/struct.Mutex.html And RwLock, a variant on Mutex that allows either one writer or multiple concurrent readers: https://doc.rust-lang.org/stable/std/sync/struct.RwLock.html https://doc.rust-lang.org/stable/std/sync/struct.RwLock.html