Hello Friends, I need your help.
I am working on linux kernel-2.6.20 for MPC8313erdb board.
I want to write a module which is given below,
When I got any signal at GPIO pin, the status of that pin will be store, and the counter will be start for 10ms. After 10ms I want to again check the status of same GPIO pin.

So is there any system call to set timer for 10ms in module programming?
Please let me know if any, how its works.

Thanks in advance

On a microcontroller you have hardware -> Timers and more than one, that can emit an interrupt, if you want every 10 ms.
You have to programm that timer on your own if there is no support from linux, or you can take a timer driver/module laying arround. Maybe from the manufacture.
To programm the timer you get all information out of the datasheet. If you set up the timer right and put your interrupt handler on that interrupt, then everything should work fine on starting that timer (once).

Inside your app. you can program your own threading mechanism.
Sofware interrupts are the same as OOP (that's why OOP exists). You use an array of pointers to Objects (Events in this scope). Implement this event class in your classes so you can receive that event.
On an interrupt (hardware, irq) every event in that array is emited (called) once. You can also split and filter that irq to different events (arrays).
If you need a interrupt table then also the pointers to that events arrays are stored in an array so you can call them over a number.

If you have a realtime clock on board then every read access to it takes 1ms (that's standard)

Yes, you have to be careful with calling other things in modules, but system calls should be save (I don't have experience in that because I program my embedded systems in assembler - totally) so you could test sleep or nanosleep if supported ?

Have very much fun!