Calling two functions at the same time

Question

Hello,

I have two functions.
The 1st function is doing some processing. I want to capture the time when the 1st functions is called(exact)(this will be my second function-it actually captures time when 1st function is called).

We can do this in sequential steps but I want to do it in same time. No computation delay.
I wanna know is there is any way where we can call the two functions at the same time.....

Thanks,
Aniketh