add support for io-uring

[fakeshadow]

PR Type

Feature

PR Checklist

Check your PR fulfills the following:

• Tests for the changes have been added / updated.
• Documentation comments have been added / updated.
• A changelog entry has been made for the appropriate packages.
• Format code with the latest stable rustfmt

Overview

Initial io-uring support with tokio-uring crate dependency.
Only actix_rt::Arbiter is started with tokio-uring runtime. actix_rt::System is left out for now.

[fakeshadow]

This could be the first platform specific feature introduced. CI may need a rework and remove --all-features flag on cargo check/test

[edward-shen]

Docs should be updated to reflect the availability of io-uring as well, e.g. in the first paragraph in lib.rs.

This should be a completely transparent change to downstream users, right? As in, acitx-web shouldn't need a major version bump to start using io-uring or opt into it for Linux targets?

[fakeshadow]

This should be a completely transparent change to downstream users, right? As in, acitx-web shouldn't need a major version bump to start using io-uring or opt into it for Linux targets?

io-uring feature is additive and the default feature for actix-web would be disabling it.
For people enabling it it would be transparent without any change to their code.(If they meet the requirement for tokio-uring)

[robjtede]

@fakeshadow looks like these Linux failures are legitimate. system_stop_stops_arbiters

[robjtede]

uhhh im not sure what i did but it works now?

edit: i suspect it's a race condition

[edward-shen]

What's the status of this PR? @robjtede, did you determine if the CI failures were transient or a legitimate issue? The last commit to this branch seems to imply it was more of a testing issue than a race condition.