Sub-millisecond precision timing in C or C++

Question

What techniques / methods exist for getting sub-millisecond precision timing data in C or C++, and what precision and accuracy do they provide? I\'m looking for methods tha

Answer 1

timeval in sys/time.h has a member 'tv_usec' which is microseconds.

This link and the code below will help illustrate:

http://www.opengroup.org/onlinepubs/000095399/basedefs/sys/time.h.html

timeval start;
timeval finish;

long int sec_diff;
long int mic_diff;

gettimeofday(&start, 0);
cout << "whooo hooo" << endl;
gettimeofday(&finish, 0);

sec_diff = finish.tv_sec - start.tv_sec;
mic_diff = finish.tv_usec - start.tv_usec;

cout << "cout-ing 'whooo hooo' took " << sec_diff << "seconds and " << mic_diff << " micros." << endl;

gettimeofday(&start, 0);
printf("whooo hooo\n");
gettimeofday(&finish, 0);

sec_diff = finish.tv_sec - start.tv_sec;
mic_diff = finish.tv_usec - start.tv_usec;

cout << "fprint-ing 'whooo hooo' took " << sec_diff << "seconds and " << mic_diff << " micros." << endl;