Timer to find elapsed time in a function call in C

Question

I want to calculate time elapsed during a function call in C, to the precision of 1 nanosecond.

Is there a timer function available in C to do it?

If yes ple

Answer 1

I don't know if you'll find any timers that provide resolution to a single nanosecond -- it would depend on the resolution of the system clock -- but you might want to look at http://code.google.com/p/high-resolution-timer/. They indicate they can provide resolution to the microsecond level on most Linux systems and in the nanoseconds on Sun systems.