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polling 3.3.2

Portable interface to epoll, kqueue, event ports, and IOCP
Documentation 
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use polling::{Event, Events, Poller};
use std::io::{self, Write};
use std::net::{TcpListener, TcpStream};
use std::sync::Arc;
use std::time::Duration;

#[test]
fn basic_io() {
    let poller = Poller::new().unwrap();
    let (read, mut write) = tcp_pair().unwrap();
    unsafe {
        poller.add(&read, Event::readable(1)).unwrap();
    }

    // Nothing should be available at first.
    let mut events = Events::new();
    assert_eq!(
        poller
            .wait(&mut events, Some(Duration::from_secs(0)))
            .unwrap(),
        0
    );
    assert!(events.is_empty());

    // After a write, the event should be available now.
    write.write_all(&[1]).unwrap();
    assert_eq!(
        poller
            .wait(&mut events, Some(Duration::from_secs(1)))
            .unwrap(),
        1
    );

    assert_eq!(events.len(), 1);
    assert_eq!(
        events.iter().next().unwrap().with_no_extra(),
        Event::readable(1)
    );
    poller.delete(&read).unwrap();
}

#[test]
fn insert_twice() {
    #[cfg(unix)]
    use std::os::unix::io::AsRawFd;
    #[cfg(windows)]
    use std::os::windows::io::AsRawSocket;

    let (read, mut write) = tcp_pair().unwrap();
    let read = Arc::new(read);

    let poller = Poller::new().unwrap();
    unsafe {
        #[cfg(unix)]
        let read = read.as_raw_fd();
        #[cfg(windows)]
        let read = read.as_raw_socket();

        poller.add(read, Event::readable(1)).unwrap();
        assert_eq!(
            poller.add(read, Event::readable(1)).unwrap_err().kind(),
            io::ErrorKind::AlreadyExists
        );
    }

    write.write_all(&[1]).unwrap();
    let mut events = Events::new();
    assert_eq!(
        poller
            .wait(&mut events, Some(Duration::from_secs(1)))
            .unwrap(),
        1
    );

    assert_eq!(events.len(), 1);
    assert_eq!(
        events.iter().next().unwrap().with_no_extra(),
        Event::readable(1)
    );

    poller.delete(&read).unwrap();
}

fn tcp_pair() -> io::Result<(TcpStream, TcpStream)> {
    let listener = TcpListener::bind("127.0.0.1:0")?;
    let a = TcpStream::connect(listener.local_addr()?)?;
    let (b, _) = listener.accept()?;
    Ok((a, b))
}