#iocp #tokio #fs #async #fs-file


IOCP support for the Tokio asynchronous runtime

6 releases

0.2.3 Aug 24, 2023
0.2.2 Apr 2, 2023
0.2.1 Mar 27, 2023
0.1.4 Mar 27, 2023
0.1.1 Sep 9, 2022

#564 in Asynchronous

29 downloads per month

MIT license

2.5K SLoC


crates.io docs.rs

This crate, inspired by tokio-uring, provides IOCP for Tokio by exposing a new Runtime that is compatible with Tokio but also can drive IOCP-backed resources. Any library that works with Tokio also works with tokio-iocp. The crate provides new resource types that work with IOCP.

Getting started

Using tokio-iocp requires starting a tokio-iocp runtime. This runtime internally manages the main (single-threaded) Tokio runtime and a IOCP driver.

use tokio_iocp::fs::File;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    tokio_iocp::start(async {
        // Open a file
        let file = File::open("hello.txt")?;

        let buf = Vec::with_capacity(4096);
        // Read some data, the buffer is passed by ownership and
        // submitted to the kernel. When the operation completes,
        // we get the buffer back.
        let (res, buf) = file.read_at(buf, 0).await;
        let n = res?;

        // Display the contents
        println!("{:?}", &buf);




Project status

The tokio-iocp project is still very young. Currently, we are focusing on supporting filesystem and network operations. We are looking forward to your contributions!


This project is licensed under the MIT license.


~477K SLoC