Precision time measurements in GNU GCC

[dude_1967]

Dear Gurus,

I would like to do some performance timing in a cross-development project.

What is the GNU equivalent of of the Microsoft function INT32 ::GetTickCount(void)? Please also indicate which header is needed.

Are there GNU equivalents to
BOOL ::QueryPerformanceCounter(LARGE_INTEGER*)
and
BOOL ::QueryPerformanceFrequency(LARGE_INTEGER*)?

Thanks a bundle.
Chris.