usage of parking_lot

[hffmnn]

Hi there and thanks for the book.

I really like the pragmatic approach which is a perfect fit for the way I like to work!

In the book, you write that one has to be cautious that the std::sync::RwLock is sync and we need to choose an async version. Reading the docs of parking_lot I can't find any info, that it is async. Also there is some info in the tokio tutorial about when to use async mutex I don't really understand (see On using std::sync::Mutex here: https://tokio.rs/tokio/tutorial/shared-state).

Also in this "audit" (https://www.reddit.com/r/rust/comments/f4zldz/i_audited_3_different_implementation_of_async/) parking_lot is shown as a sync example. So I guess the current implementation blocks the current thread whenever someone tries to acquire the lock?

Any idea which implementation is "right"?