What is mio and where can I get the knowledge about mio?

where can I get the Comprehensive guide to the mio library APIs? Thank you

Mio is a very low-level IO library. It's used internally by the Tokio async runtime to implement asynchronous IO. Applications can also use mio directly, but it's much harder and lower level than using Tokio.

See the documentation:

There's even a guide:

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