split

tokio::io::split()

    /// Split a single value implementing `AsyncRead + AsyncWrite` into separate
    /// `AsyncRead` and `AsyncWrite` handles.
    ///
    /// To restore this read/write object from its `split::ReadHalf` and
    /// `split::WriteHalf` use `unsplit`.
    pub fn split<T>(stream: T) -> (ReadHalf<T>, WriteHalf<T>)
    where T: AsyncRead + AsyncWrite {
        let inner = Arc::new(Inner {
            locked: AtomicBool::new(false),
            stream: UnsafeCell::new(stream),
        });
        let rd = ReadHalf { inner: inner.clone() };
        let wr = WriteHalf { inner };
        (rd, wr)
    }