[Bug libc/30287] sigevent needs a notification method compatible with poll

["bugzilla at tecnocode dot co.uk" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30287

--- Comment #4 from Philip Withnall <bugzilla at tecnocode dot co.uk> ---
`timerfd_create()` does emit a notification via an FD, yes, but I don’t see how
that could be hooked up to `getaddrinfo_a()` using existing APIs, so that it
efficiently emits its notification when the address lookup is complete.

That could be achieved by using `SIGEV_THREAD` and calling `timerfd_settime()`
from the thread function to fire the timerfd when the address lookup is
complete. That doesn’t solve the original problem, though, because it requires
a thread to be spawned to fire the timerfd. That’s not very performant, and
shouldn’t be necessary at all: firing a timerfd is basically a single bit
change in a data structure, not a complex block of work which should need to be
run in a separate thread.

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