uv_backend_fd like support to make integration to OS gui event loop possible!

[congzhangzh]

I want to make webview_deno support async binding, which under the hood need pool tokio event in separate thread, and trigger on UI thread!

Is your feature request related to a problem? Please describe.
no

Describe the solution you'd like
A backend fd mechanism

Describe alternatives you've considered
no

Additional context
No

webview/webview_deno#185 (comment)
https://docs.libuv.org/en/v1.x/loop.html#c.uv_backend_fd
https://www.electronjs.org/blog/electron-internals-node-integration
webview/webview#578
webview/webview_deno#185

[Darksonn]

It's unclear exactly what you're asking for, but it sounds like a duplicate of #6178.

[congzhangzh]

Hi folks, I want do something like integrate event loop with OS gui event loop, and electron already find a way to do it, which need pool event loop in backend thread and post and run on ui thread.

refs:

https://docs.libuv.org/en/v1.x/loop.html#c.uv_backend_fd
https://docs.libuv.org/en/v1.x/loop.html#c.uv_run_mode
https://github.com/electron/electron/blob/8f00cc9c0e78b95e4de14b9b9e1a7df20935e948/shell/common/node_bindings.cc#L929
https://gist.github.com/bagder/ffb613e3c3c5f41813b31fc09ef1c261
https://docs.libuv.org/en/stable/guide/eventloops.html

tks:)

[Noah-Kennedy]

I'm working on a patchset right now which will expose functionality which I believe will resolve this.