When changing the example to run all windows on the main thread like this:

fn main() {
    let window1 = winit::WindowBuilder::new().build().unwrap();
    let window2 = winit::WindowBuilder::new().build().unwrap();
    let window3 = winit::WindowBuilder::new().build().unwrap();

    loop {
        poll_events(1, &window1);
        poll_events(2, &window2);
        poll_events(3, &window3);
        std::thread::sleep(std::time::Duration::from_millis(100));
    }
}

fn poll_events(i: i32, window: &winit::Window) {
    for event in window.poll_events() {
        println!("{:?} {:?}", i, &event);
        match event {
            winit::Event::Closed => break,
            _ => ()
        }
    }
}

it seems to behave fine, however, only window1 seems to receive most mouse or keyboard events.

It almost seems like input events are just being received by the first window that happens to poll for them, rather than only going to the currently focused window. For example, mouse coordinates are always relative to the currently focused window, however they are not necessarily received by that window (window1 normally receives them all regardless of focus as it is the first to poll in the loop above).

Multiwindow example is broken on OS X #56

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