how to perform two tasks at a time in kernel...

iam doing a project on at91sam9261 using linux-2.6-28 version.
i have to do two tasks at a time in kernel .how can i perform it.one task is to update the data frm gpio pin and back end i have read the data of one register.

You can't. They have to take turns.

actually my prblem is:

i have to count the number of pulse generateed at interrupt pin and at the same time i have to read the data from aread register via spi protocol ata time...iam not bothered about the instantaoeus read of pulsecount when i press any key then i should get the counts..but at the back end i should read the register continusly....