How to read GPIO in real time?

Guys, I'm using a raspberry pi as a controller,
and this controller needs to read a lot of GPIO (not including home and limits).

I'm trying to poll read GPIO using threads in my custom Glade UI.
But I found that this read is not timely and will be a little later than my signal.

How should I get these GPIOs, so that this IO can be read interrupted?
(I'm a newbie and don't know much about the underlying stuff)
Hope you can give me some advice?

thanks,chen

I think the best solution is to use the hal_pi_gpio module:

forum.linuxcnc.org/27-driver-boards/3770...r-raspberry-pi-gpios

Your GUI will never be able to respond to GPIO inputs in real=time as the GUIs are not realtime.

You should leave home and limits to be handled by the normal realtime motion module.