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# Mio – Metal IO
Mio is a lightweight I/O library for Rust with a focus on adding as little
overhead as possible over the OS abstractions.
[![Crates.io][crates-badge]][crates-url]
[![MIT licensed][mit-badge]][mit-url]
[![Build Status][azure-badge]][azure-url]
[![Build Status][cirrus-badge]][cirrus-url]
[crates-badge]: https://img.shields.io/crates/v/mio.svg
[crates-url]: https://crates.io/crates/mio
[mit-badge]: https://img.shields.io/badge/license-MIT-blue.svg
[mit-url]: LICENSE
[azure-badge]: https://dev.azure.com/tokio-rs/Tokio/_apis/build/status/tokio-rs.mio?branchName=master
[azure-url]: https://dev.azure.com/tokio-rs/Tokio/_build/latest?definitionId=2&branchName=master
[cirrus-badge]: https://api.cirrus-ci.com/github/carllerche/mio.svg
[cirrus-url]: https://cirrus-ci.com/github/carllerche/mio
**API documentation**
* [master](https://tokio-rs.github.io/mio/doc/mio/)
* [v0.6](https://docs.rs/mio/^0.6)
This is a low level library, if you are looking for something easier to get
started with, see [Tokio](https://tokio.rs).
## Usage
To use `mio`, first add this to your `Cargo.toml`:
```toml
[dependencies]
mio = "0.6"
```
Then, add this to your crate root:
```rust
extern crate mio;
```
## Features
* Non-blocking TCP, UDP.
* I/O event notification queue backed by epoll, kqueue, and IOCP.
* Zero allocations at runtime
* Platform specific extensions.
## Non-goals
The following are specifically omitted from Mio and are left to the user
or higher-level libraries.
* File operations
* Thread pools / multi-threaded event loop
* Timers
## Platforms
Currently supported platforms:
* Linux
* OS X
* Windows
* FreeBSD
* NetBSD
* Solaris
* Android
* iOS
There are potentially others. If you find that Mio works on another
platform, submit a PR to update the list!
## Community
A group of Mio users hang out in the #mio channel on the Mozilla IRC
server (irc.mozilla.org). This can be a good place to go for questions.
## Contributing
Interested in getting involved? We would love to help you! For simple
bug fixes, just submit a PR with the fix and we can discuss the fix
directly in the PR. If the fix is more complex, start with an issue.
If you want to propose an API change, create an issue to start a
discussion with the community. Also, feel free to talk with us in the
IRC channel.
Finally, be kind. We support the [Rust Code of Conduct](https://www.rust-lang.org/conduct.html).
|
