High Resolution timers support in Fedora?

Hi, I would like to play with high resolution timers under linux and GCC. Where is the function "gethrtime()" ? Is that function only found on solaris? ============= snip from a grep in /usr/include/sys ==================== time.h:extern hrtime_t gethrtime(void); time.h:extern hrtime_t gethrtime_unscaled(void); time.h:extern hrtime_t gethrtime_max(void); time.h:hrtime_t gethrtime(void); time.h:hrtime_t gethrtime(); ======================================================================= Is ktimer subsystem what we will have in the future? Thanks, Ernesto