What do you mean by 'need'? If you mean every Rust program requires a dispatcher to run, then no, Rust does not need a CPU dispatcher. Thread and locks are not

What do you mean by 'need'? If you mean every Rust program requires a dispatcher to run, then no, Rust does not need a CPU dispatcher. Thread and locks are not primitives: they're implemented in the standard library (the std part, specifically). The 'thread' safety guarantees don't rely on that functionality, instead the arrows go the other way: the spawning and locking constructs build on the guarantees (driven by the Send and Sync traits, which are purely compile-time constructs) to provide expressive yet safe API. For instance, there's numerous operating systems built in Rust, for instance intermezzOS seems to be pure Rust except for the single file https://github.com/intermezzOS/kernel/blob/master/src/asm/boot.asm https://github.com/intermezzOS/kernel/blob/master/src/asm/bo... . If you mean that it would be really nice if there was a general purpose dispatcher library available, then sure, that seems like something that would be great on crates.io. In any case, I don't see how your comment relates to mine.