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tokio-rs /tokio

A runtime for writing reliable asynchronous applications with Rust. Provides I/O, networking, schedu...

9.0K Stars 839 Forks Last release: 21 days ago (tokio-0.2.22) MIT License 2.0K Commits 171 Releases

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A runtime for writing reliable, asynchronous, and slim applications with the Rust programming language. It is:

  • Fast: Tokio's zero-cost abstractions give you bare-metal performance.

  • Reliable: Tokio leverages Rust's ownership, type system, and concurrency model to reduce bugs and ensure thread safety.

  • Scalable: Tokio has a minimal footprint, and handles backpressure and cancellation naturally.

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Website |Guides |API Docs |Roadmap |Chat


Tokio is an event-driven, non-blocking I/O platform for writing asynchronous applications with the Rust programming language. At a high level, it provides a few major components:

  • A multithreaded, work-stealing based task scheduler.
  • A reactor backed by the operating system's event queue (epoll, kqueue, IOCP, etc...).
  • Asynchronous TCP and UDP sockets.

These components provide the runtime components necessary for building an asynchronous application.


A basic TCP echo server with Tokio:

use tokio::net::TcpListener; use tokio::prelude::\*; #[tokio::main] async fn main() -\> Result\> { let mut listener = TcpListener::bind("").await?; loop { let (mut socket, \_) = listener.accept().await?; tokio::spawn(async move { let mut buf = [0; 1024]; // In a loop, read data from the socket and write the data back. loop { let n = match buf).await { // socket closed Ok(n) if n == 0 =\> return, Ok(n) =\> n, Err(e) =\> { eprintln!("failed to read from socket; err = {:?}", e); return; } }; // Write the data back if let Err(e) = socket.write\_all(&buf[0..n]).await { eprintln!("failed to write to socket; err = {:?}", e); return; } } }); } }

More examples can be found here. For a larger "real world" example, see themini-redis repository.

To see a list of the available features flags that can be enabled, check ourdocs.

Getting Help

First, see if the answer to your question can be found in the Guides or theAPI documentation. If the answer is not there, there is an active community in the Tokio Discord server. We would be happy to try to answer your question. You can also ask your question on the discussions page.


:balloon: Thanks for your help improving the project! We are so happy to have you! We have a contributing guide to help you get involved in the Tokio project.

Related Projects

In addition to the crates in this repository, the Tokio project also maintains several other libraries, including:



]( A low-level, cross-platform abstraction over OS I/O APIs that powers



Supported Rust Versions

Tokio is built against the latest stable release. The minimum supported version is 1.39. The current Tokio version is not guaranteed to build on Rust versions earlier than the minimum supported version.


This project is licensed under the MIT license.


Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in Tokio by you, shall be licensed as MIT, without any additional terms or conditions.

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