tokio 0.2.0

An event-driven, non-blocking I/O platform for writing asynchronous I/O backed applications.
Documentation 
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use std::future::Future;
use std::pin::Pin;
use std::task::{Context, Poll};

/// Yield execution back to the Tokio runtime.
pub async fn yield_now() {
    /// Yield implementation
    struct YieldNow {
        yielded: bool,
    }

    impl Future for YieldNow {
        type Output = ();

        fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<()> {
            if self.yielded {
                return Poll::Ready(());
            }

            self.yielded = true;
            cx.waker().wake_by_ref();
            Poll::Pending
        }
    }

    YieldNow { yielded: false }.await
}