I would guess `Arc<Mutex<T>>`, `Arc<RWLock<T>>` and `Arc<SomeConcurrentContainer>` would all work (cloning them is a ref-count - the handle gets copied, not the

I would guess `Arc<Mutex<T>>`, `Arc<RWLock<T>>` and `Arc<SomeConcurrentContainer>` would all work (cloning them is a ref-count - the handle gets copied, not the contents).