In my experience multithreaded Rust isn't substantially more restrictive then multithreaded C++ at writing code free of data races (although it very much is at writing single-threaded code free of use-after-free). The primary methods in Rust to share memory across threads (in my experience writing high-performance wait-free but userspace not kernel code) are custom UnsafeCell wrappers which implement Send and Sync and have safe locking mechanisms preventing data races, safe atomics, or safe mutexes.
