uringy 0.5.0

A simple single-threaded concurrency runtime for Rust based on io_uring.
Documentation 
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use crate::runtime;
use std::io;
use std::time::Duration;

/// ...
pub fn sleep(duration: Duration) -> io::Result<()> {
    let timespec = io_uring::types::Timespec::new()
        .sec(duration.as_secs())
        .nsec(duration.subsec_nanos());

    let sqe = io_uring::opcode::Timeout::new(&timespec).build();
    let result = runtime::syscall(sqe);

    let error = result.unwrap_err();
    match error.raw_os_error().unwrap() {
        libc::ETIME => Ok(()),
        libc::ECANCELED => Err(error),
        _ => unreachable!(),
    }
}

#[cfg(test)]
mod tests {
    use super::*;
    use crate::runtime;
    use std::time::Instant;

    mod sleep {
        use super::*;

        #[test]
        fn doesnt_hang() {
            runtime::start(|| {
                let before = Instant::now();

                sleep(Duration::from_millis(0)).unwrap();

                assert!(before.elapsed() < Duration::from_millis(5));
            })
            .unwrap();
        }

        #[test]
        fn passes_time() {
            runtime::start(|| {
                let before = Instant::now();

                sleep(Duration::from_millis(5)).unwrap();

                assert!(before.elapsed() > Duration::from_millis(5));
            })
            .unwrap();
        }
    }
}