`select.poll.poll` should use `ppoll` when it's available

[SpecLad]

Feature or enhancement

Proposal:

ppoll is an extended version of poll that lets you set the timeout with nanosecond precision (it also supports setting a signal mask, but that's not important right now). It's available on Linux, FreeBSD, OpenBSD, NetBSD, and probably other Unix-likes.

It would be useful if the Python poll function would transparently use ppoll on systems where it is available to provide timeouts with nanosecond precision (as opposed to the default millisecond precision).

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs

• gh-142434: Use ppoll() if available in select.poll #143529

[serhiy-storchaka]

Looks reasonable. Do you want to provide a PR, @SpecLad?

[vstinner]

I'm interested to work on this issue if @SpecLad doesn't want to write a pull request.

[SpecLad]

I'd give it a try, but I don't know yet when I'll get around to it, so feel free to preempt me. 🙂

[vstinner]

I created #143529 to use ppoll() is available.

[vstinner]

Feature implemented in #143529.