Russ implemented his own setmcontext and getmcontext functions
to work on systems that doesn't properly support ucontext.
So I don't think you really need ucontext support in your libc.

By the way, I maintain an updated version of libtask:

https://github.com/0intro/libtask

I've used it on quite a few places over the years,
but I only on POSIX systems so far.

-- 
David du Colombier

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