ANSI C: deal with something on every rising edge input

Hi everyone,

I need your help with this situation. Here is some information about my project.

NI USB-6501

NIDAQmxBase370, NIDAQ1501f3

Visual C++ 2008, Windows XP

What I need to do is:

There is a periodic signal input from the board to my computer.

The input period is ~ 330 ms. The pulse width is ~ 0.7 ms.

I need to deal with something every time the pulse appears.

I tried to do this by reading continuously, but some of the pulses were missed because my program can only deal with this data-reading thread every 1 ms.

Is there any smarter way to do this please?

I would have a help with this if possible.

Thank you very much!

Best Regards,

Liyan