timer.h

00001 #ifndef __TIMER_H__
00002 #define __TIMER_H__
00003 
00004 #include <time.h>
00005 
00006 // start timer and return start time
00007 double start_time() {
00008   struct timespec tp;
00009   clock_gettime(CLOCK_REALTIME, &tp);
00010   return 1e9*tp.tv_sec + tp.tv_nsec;
00011 }
00012 
00013 // return time in seconds
00014 double stop_time(double begin) {
00015   struct timespec tp;
00016   clock_gettime(CLOCK_REALTIME, &tp);
00017   double end = 1e9*tp.tv_sec + tp.tv_nsec;
00018   return (end-begin)*1e-9;
00019 }
00020 
00021 #endif // __TIMER_H__