which provides the following benefits for the resulting [File]:

- I/O methods ([File.Read], [File.Write], [File.ReadAt], and [File.WriteAt]) do not block an OS thread.
- Deadline methods ([File.SetDeadline], [File.SetReadDeadline], and [File.SetWriteDeadline]) are supported.

This enhancement is especially beneficial for applications that communicate via named pipes on Windows.

		return 0, context.DeadlineExceeded
	}
	c.setWriteDeadline()
	n, err = c.Conn.Write(b)
	return n, err
}

// SetDeadline will set the deadline for reads and writes.
// A zero value for t means I/O operations will not time out.
func (c *DeadlineConn) SetDeadline(t time.Time) error {
	c.mu.Lock()
	defer c.mu.Unlock()

	c.readSetAt = time.Time{}
	c.writeSetAt = time.Time{}

pkg net, method (*UnixListener) SyscallConn() (syscall.RawConn, error)
pkg net/smtp, method (*Client) Noop() error
pkg os, func IsTimeout(error) bool
pkg os, method (*File) SetDeadline(time.Time) error
pkg os, method (*File) SetReadDeadline(time.Time) error
pkg os, method (*File) SetWriteDeadline(time.Time) error
pkg os, method (*PathError) Timeout() bool
pkg os, method (*SyscallError) Timeout() bool

pkg net, type Conn interface { Close, LocalAddr, Read, RemoteAddr, SetDeadline, SetReadDeadline, SetWriteDeadline, Write }
pkg net, type Conn interface, Close() error
pkg net, type Conn interface, LocalAddr() Addr
pkg net, type Conn interface, Read([]uint8) (int, error)
pkg net, type Conn interface, RemoteAddr() Addr
pkg net, type Conn interface, SetDeadline(time.Time) error
pkg net, type Conn interface, SetReadDeadline(time.Time) error

			}
			return b, err
		}
		read += int64(n)
		if want >= 0 && read == want {
			// No need to read more...
			return b, nil
		}
	}
}

// getDeadline will truncate the deadline so it is at least 1ms and at most MaxDeadline.
func getDeadline(d time.Duration) time.Duration {
	if d < time.Millisecond {
		return 0
	}
	if d > MaxDeadline {
		return MaxDeadline
	}
	return d
}

func (c *Connection) newMuxClient(ctx context.Context) (*muxClient, error) {
	client := newMuxClient(ctx, atomic.AddUint64(&c.NextID, 1), c)
	if dl, ok := ctx.Deadline(); ok {
		client.deadline = getDeadline(time.Until(dl))
		if client.deadline == 0 {
			client.cancelFn(context.DeadlineExceeded)
			return nil, context.DeadlineExceeded
		}
	}
	for {
		// Handle the extremely unlikely scenario that we wrapped.