+#+win32
+(defmethod (setf non-blocking-mode)
+ (non-blocking-p (socket socket))
+ (declare (optimize (speed 3)))
+ (setf (slot-value socket 'non-blocking-p)
+ (when non-blocking-p t))
+ (let ((fd (socket-file-descriptor socket)))
+ (when (= (the (signed-byte 32) -1)
+ (the (signed-byte 32)
+ (sockint::ioctl fd sockint::FIONBIO (if non-blocking-p 1 0))))
+ (socket-error "ioctl(FIONBIO)"))
+ (when non-blocking-p t)))