I don't really understand what you're trying to get at, but the concurrency abstractions/safety in Rust is static, there's little-to-no dynamic cost over the ra

I don't really understand what you're trying to get at, but the concurrency abstractions/safety in Rust is static, there's little-to-no dynamic cost over the raw C/C++ APIs. And, in fact, the checks mean that one can sometimes be more aggressive about what designs can be used, without risking weird runtime corruption.