mio 0.6.21

Lightweight non-blocking IO
Documentation 
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use {expect_events, sleep_ms};
use mio::{channel, Events, Poll, PollOpt, Ready, Token};
use mio::event::Event;
use std::sync::mpsc::TryRecvError;
use std::thread;
use std::time::Duration;

#[test]
pub fn test_poll_channel_edge() {
    let poll = Poll::new().unwrap();
    let mut events = Events::with_capacity(1024);
    let (tx, rx) = channel::channel();

    poll.register(&rx, Token(123), Ready::readable(), PollOpt::edge()).unwrap();

    // Wait, but nothing should happen
    let num = poll.poll(&mut events, Some(Duration::from_millis(300))).unwrap();
    assert_eq!(0, num);

    // Push the value
    tx.send("hello").unwrap();

    // Polling will contain the event
    let num = poll.poll(&mut events, Some(Duration::from_millis(300))).unwrap();
    assert_eq!(1, num);

    let event = events.get(0).unwrap();
    assert_eq!(event.token(), Token(123));
    assert_eq!(event.readiness(), Ready::readable());

    // Poll again and there should be no events
    let num = poll.poll(&mut events, Some(Duration::from_millis(300))).unwrap();
    assert_eq!(0, num);

    // Read the value
    assert_eq!("hello", rx.try_recv().unwrap());

    // Poll again, nothing
    let num = poll.poll(&mut events, Some(Duration::from_millis(300))).unwrap();
    assert_eq!(0, num);

    // Push a value
    tx.send("goodbye").unwrap();

    // Have an event
    let num = poll.poll(&mut events, Some(Duration::from_millis(300))).unwrap();
    assert_eq!(1, num);

    let event = events.get(0).unwrap();
    assert_eq!(event.token(), Token(123));
    assert_eq!(event.readiness(), Ready::readable());

    // Read the value
    rx.try_recv().unwrap();

    // Drop the sender half
    drop(tx);

    let num = poll.poll(&mut events, Some(Duration::from_millis(300))).unwrap();
    assert_eq!(1, num);

    let event = events.get(0).unwrap();
    assert_eq!(event.token(), Token(123));
    assert_eq!(event.readiness(), Ready::readable());

    match rx.try_recv() {
        Err(TryRecvError::Disconnected) => {}
        no => panic!("unexpected value {:?}", no),
    }

}

#[test]
pub fn test_poll_channel_oneshot() {
    let poll = Poll::new().unwrap();
    let mut events = Events::with_capacity(1024);
    let (tx, rx) = channel::channel();

    poll.register(&rx, Token(123), Ready::readable(), PollOpt::edge() | PollOpt::oneshot()).unwrap();

    // Wait, but nothing should happen
    let num = poll.poll(&mut events, Some(Duration::from_millis(300))).unwrap();
    assert_eq!(0, num);

    // Push the value
    tx.send("hello").unwrap();

    // Polling will contain the event
    let num = poll.poll(&mut events, Some(Duration::from_millis(300))).unwrap();
    assert_eq!(1, num);

    let event = events.get(0).unwrap();
    assert_eq!(event.token(), Token(123));
    assert_eq!(event.readiness(), Ready::readable());

    // Poll again and there should be no events
    let num = poll.poll(&mut events, Some(Duration::from_millis(300))).unwrap();
    assert_eq!(0, num);

    // Read the value
    assert_eq!("hello", rx.try_recv().unwrap());

    // Poll again, nothing
    let num = poll.poll(&mut events, Some(Duration::from_millis(300))).unwrap();
    assert_eq!(0, num);

    // Push a value
    tx.send("goodbye").unwrap();

    // Poll again, nothing
    let num = poll.poll(&mut events, Some(Duration::from_millis(300))).unwrap();
    assert_eq!(0, num);

    // Reregistering will re-trigger the notification
    for _ in 0..3 {
        poll.reregister(&rx, Token(123), Ready::readable(), PollOpt::edge() | PollOpt::oneshot()).unwrap();

        // Have an event
        let num = poll.poll(&mut events, Some(Duration::from_millis(300))).unwrap();
        assert_eq!(1, num);

        let event = events.get(0).unwrap();
        assert_eq!(event.token(), Token(123));
        assert_eq!(event.readiness(), Ready::readable());
    }

    // Get the value
    assert_eq!("goodbye", rx.try_recv().unwrap());

    poll.reregister(&rx, Token(123), Ready::readable(), PollOpt::edge() | PollOpt::oneshot()).unwrap();

    // Have an event
    let num = poll.poll(&mut events, Some(Duration::from_millis(300))).unwrap();
    assert_eq!(0, num);

    poll.reregister(&rx, Token(123), Ready::readable(), PollOpt::edge() | PollOpt::oneshot()).unwrap();

    // Have an event
    let num = poll.poll(&mut events, Some(Duration::from_millis(300))).unwrap();
    assert_eq!(0, num);
}

#[test]
pub fn test_poll_channel_level() {
    let poll = Poll::new().unwrap();
    let mut events = Events::with_capacity(1024);
    let (tx, rx) = channel::channel();

    poll.register(&rx, Token(123), Ready::readable(), PollOpt::level()).unwrap();

    // Wait, but nothing should happen
    let num = poll.poll(&mut events, Some(Duration::from_millis(300))).unwrap();
    assert_eq!(0, num);

    // Push the value
    tx.send("hello").unwrap();

    // Polling will contain the event
    for i in 0..5 {
        let num = poll.poll(&mut events, Some(Duration::from_millis(300))).unwrap();
        assert!(1 == num, "actually got {} on iteration {}", num, i);

        let event = events.get(0).unwrap();
        assert_eq!(event.token(), Token(123));
        assert_eq!(event.readiness(), Ready::readable());
    }

    // Read the value
    assert_eq!("hello", rx.try_recv().unwrap());

    // Wait, but nothing should happen
    let num = poll.poll(&mut events, Some(Duration::from_millis(300))).unwrap();
    assert_eq!(0, num);
}

#[test]
pub fn test_poll_channel_writable() {
    let poll = Poll::new().unwrap();
    let mut events = Events::with_capacity(1024);
    let (tx, rx) = channel::channel();

    poll.register(&rx, Token(123), Ready::writable(), PollOpt::edge()).unwrap();

    // Wait, but nothing should happen
    let num = poll.poll(&mut events, Some(Duration::from_millis(300))).unwrap();
    assert_eq!(0, num);

    // Push the value
    tx.send("hello").unwrap();

    // Wait, but nothing should happen
    let num = poll.poll(&mut events, Some(Duration::from_millis(300))).unwrap();
    assert_eq!(0, num);
}

#[test]
pub fn test_dropping_receive_before_poll() {
    let poll = Poll::new().unwrap();
    let mut events = Events::with_capacity(1024);
    let (tx, rx) = channel::channel();

    poll.register(&rx, Token(123), Ready::readable(), PollOpt::edge()).unwrap();

    // Push the value
    tx.send("hello").unwrap();

    // Drop the receive end
    drop(rx);

    // Wait, but nothing should happen
    let num = poll.poll(&mut events, Some(Duration::from_millis(300))).unwrap();
    assert_eq!(0, num);
}

#[test]
pub fn test_mixing_channel_with_socket() {
    use mio::net::{TcpListener, TcpStream};

    let poll = Poll::new().unwrap();
    let mut events = Events::with_capacity(1024);
    let (tx, rx) = channel::channel();

    // Create the listener
    let l = TcpListener::bind(&"127.0.0.1:0".parse().unwrap()).unwrap();

    // Register the listener with `Poll`
    poll.register(&l, Token(0), Ready::readable(), PollOpt::edge()).unwrap();
    poll.register(&rx, Token(1), Ready::readable(), PollOpt::edge()).unwrap();

    // Push a value onto the channel
    tx.send("hello").unwrap();

    // Connect a TCP socket
    let s1 = TcpStream::connect(&l.local_addr().unwrap()).unwrap();

    // Register the socket
    poll.register(&s1, Token(2), Ready::readable(), PollOpt::edge()).unwrap();

    // Sleep a bit to ensure it arrives at dest
    sleep_ms(250);

    expect_events(&poll, &mut events, 2, vec![
        Event::new(Ready::empty(), Token(0)),
        Event::new(Ready::empty(), Token(1)),
    ]);
}

#[test]
pub fn test_sending_from_other_thread_while_polling() {
    const ITERATIONS: usize = 20;
    const THREADS: usize = 5;

    // Make sure to run multiple times
    let poll = Poll::new().unwrap();
    let mut events = Events::with_capacity(1024);

    for _ in 0..ITERATIONS {
        let (tx, rx) = channel::channel();
        poll.register(&rx, Token(0), Ready::readable(), PollOpt::edge()).unwrap();

        for _ in 0..THREADS {
            let tx = tx.clone();

            thread::spawn(move || {
                sleep_ms(50);
                tx.send("ping").unwrap();
            });
        }

        let mut recv = 0;

        while recv < THREADS {
            let num = poll.poll(&mut events, None).unwrap();

            if num != 0 {
                assert_eq!(1, num);
                assert_eq!(events.get(0).unwrap().token(), Token(0));

                while let Ok(_) = rx.try_recv() {
                    recv += 1;
                }
            }
        }
    }
}