gettimeofday sample code

#include < sys/time.h >

#include < stdio.h >

int main()

{

  struct timeval tv, tv2;

  unsigned long long start_utime, end_utime;

  gettimeofday(&tv,NULL);

  start_utime = tv.tv_sec * 1000000 + tv.tv_usec;

 

  usleep(1000);

  gettimeofday(&tv2,NULL);

  end_utime = tv2.tv_sec * 1000000 + tv2.tv_usec;

 

  printf(" runtime = %llu\n", end_utime - start_utime );

}