#tokio #core #async #event #rest #loop #primitives #foundation


Core I/O and event loop primitives for asynchronous I/O in Rust. Foundation for the rest of the tokio crates.

18 releases

0.1.17 Apr 11, 2018
0.1.16 Mar 23, 2018
0.1.12 Jan 8, 2018
0.1.11 Dec 12, 2017
0.1.1 Nov 22, 2016

#25 in Asynchronous

Download history 16816/week @ 2018-10-12 14666/week @ 2018-10-19 17326/week @ 2018-10-26 16783/week @ 2018-11-02 19459/week @ 2018-11-09 15423/week @ 2018-11-16 15755/week @ 2018-11-23 17620/week @ 2018-11-30 18985/week @ 2018-12-07 17546/week @ 2018-12-14 10560/week @ 2018-12-21 12190/week @ 2018-12-28 15336/week @ 2019-01-04 16598/week @ 2019-01-11 15337/week @ 2019-01-18

65,227 downloads per month
Used in 934 crates (371 directly)



Deprecation notice.

This crate is scheduled for deprecation in favor of tokio.

tokio-core is still actively maintained, but only bug fixes will be applied. All new feature development is happening in tokio.


Core I/O and event loop abstraction for asynchronous I/O in Rust built on futures and mio.

Build Status Build status




First, add this to your Cargo.toml:

tokio-core = "0.1"

Next, add this to your crate:

extern crate tokio_core;

You can find extensive documentation and examples about how to use this crate online at https://tokio.rs as well as the examples folder in this repository. The API documentation is also a great place to get started for the nitty-gritty.


This project is licensed under either of

at your option.


Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in tokio-core by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.


~55K SLoC