tokio 1.0 support

[incker]

New version of tokio is released
current version of tokio is 0.2 Cargo.toml

Better upgrade, to avoid downloading two versions of tokio in projects

[diwic]

Ok, feel free to submit a PR!

[ids1024]

This seem to require a few straightforward changes, but also tokio::io::Registration is no longer publicly exposed. Not sure what to replace the uses of that with (I'd need to look more into exactly how it works).

[diwic]

Filed tokio-rs/tokio#3040 upstream, let's see what they say.

[f-koehler]

The issue tokio-rs/tokio#3040 was closed and a comment about using AsyncFd was added (see tokio-rs/tokio#2903). This new type is available in tokio from version v0.3.2 onwards.

[qwandor]

Has anyone been able to make progress on this? Tokio 1.0 is now out, so it would be great to support that.

[diwic]

Nothing that I'm aware of. But we should probably target 1.0 rather than 0.3 now, so I changed the title.

[coolreader18]

I'm looking into this now, it's definitely possible to replace watch_reg/Registration::new(mio::EventedFd) with AsyncFd, but waker_reg is a bit more tricky; I'm not very well-versed in how event loops/reactors work, but I think it might be possible to just use the Waker from the Context that we get passed, along with a Arc<Mutex<Waker>> or similar.