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I/O primitives and event loop for async I/O in Rust


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

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First, add this to your Cargo.toml:

tokio-core = "0.1"

Next, add this to your crate:

extern crate tokio_core;


There are a few small examples showing off how to use this library:

  • - a simple TCP echo server
  • - an implementation of a SOCKSv5 proxy server

What is tokio-core?

This crate is a connection futures, a zero-cost implementation of futures in Rust, and mio and a crate for zero-cost asynchronous I/O. The types and structures implemented in tokio-core implement Future and Stream traits as appropriate. For example connecting a TCP stream returns a Future resolving to a TCP stream, and a TCP listener implements a stream of TCP streams (accepted connections).

This crate also provides facilities such as:

  • TCP streams
  • TCP listeners
  • UDP sockets
  • Timeouts
  • Data owned and local to the event loop
  • An Executor implementation for a futures’ Task

The intention of tokio-core is to provide a concrete implementation for crates built on top of asynchronous I/O. For example you can easily turn a TCP stream into a TLS/SSL stream with the tokio-tls crate or use the combinators to compose working with data on sockets.

Check out the documentation for more information, and more coming here soon!


tokio-core is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0), with portions covered by various BSD-like licenses.

See LICENSE-APACHE, and LICENSE-MIT for details.

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-   0.1.1 zip tar
-   0.1.0 zip tar