[avr-gcc-list] How to accurately measure a square wave frequency

[system default]

Hi all,
My name is Joe, I am new to the list and AVR-GCC.
I am using an ATMega32, and would like to measure a
pulse on a pin. I was originally using a basic compiler
that had a high level function called PulseIn.
This function returned the time in 10uS ticks of the
high and low parts of the square wave.

I need something smilar to this so i can calculate the 
frequency. I have never used AVR-GCC before so I am 
unsure how to do this. I am using a 4Mhz crystal, If I use
a loop of some sort with a delay of 10uS how much error 
will the code overhead cause? Does anyone already have
a method to determin the frequency of a pulse?
Or know a good method to do this?

Note: It must work on a range from ~100Hz to ~60kHz

Thank you very much.

-Joe