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Have you tried mioco [1]? It looks fine enough to avoid the callback hell.

Thanks. So no clear winner yet. Does libraries have to be re-written to support the coroutines ?

MIO is a very low-level library (as it tries to be as zero-overhead as possible), and there's multiple nicer abstractions written on top of it. Check this: https://github.com/carllerche/mio#libraries

mio has nothing to do with callbacks in its design, unless you build such an abstraction yourself on top of it.

However, without an ergonomic way to create state machines (i.e. generators), it's hard to use at all in the intended fashion (small per-connection state instead of large boxed closures or coroutine/thread stacks).

Rust's M:N design was not going to scale to 1M connections, and it's hugely unlikely that you need 1M simultaneous connections.