{

gettimeofday(&stop, NULL);

long long rv;

rv = (stop.tv_sec - start.tv_sec) * 1000000 + stop.tv_usec - start.tv_usec;

return rv;

{

LARGE_INTEGER EndingTime;

QueryPerformanceCounter(&EndingTime);

LARGE_INTEGER ElapsedMicroseconds;

ElapsedMicroseconds.QuadPart = EndingTime.QuadPart - StartingTime.QuadPart;

long long rv = (long long)ElapsedMicroseconds.QuadPart;

return rv;