Method poll

bootloader/kernel/src/drivers/virtio_gpu.rs:552–585

(
        self: core::pin::Pin<&mut Self>,
        cx: &mut core::task::Context<'_>,
    )

impl futures::future::Future for IdWait {
    type Output = ();
    fn poll(
        self: core::pin::Pin<&mut Self>,
        cx: &mut core::task::Context<'_>,
    ) -> core::task::Poll<Self::Output> {
        {
            let val = &mut WAKERS.lock()[self.id];
            match val {
                IdWaker::None => {
                    let aw = AtomicWaker::new();
                    aw.register(&cx.waker());
                    *val = IdWaker::Waker(aw);

                    return core::task::Poll::Pending;
                }
                IdWaker::Done => {
                    *val = IdWaker::None;
                    return core::task::Poll::Ready(());
                }
                IdWaker::Waker(e) => {
                    e.register(&cx.waker());
                }
            }
        }
        {
            let val = &mut WAKERS.lock()[self.id];
            match val {
                IdWaker::Done => {
                    *val = IdWaker::None;
                    core::task::Poll::Ready(())
                }
                _ => core::task::Poll::Pending,
            }
        }
    }
}

#[repr(u32)]