using sleep() and time() commands together in c++

totaljj · 02-14-2007, 05:06 AM

clock_t start, finish;
start=clock();
sleep(3);
finish=clock();

duration=(double(finish-start))/CLOCKS_PER_SEC;

above doesn't seem to add sleep time which is 3 seconds.

wjevans_7d1@yahoo.co · 02-14-2007, 07:12 AM

clock() returns not the elapsed time (wall clock time), but the processor time; that is, the amount of time that the process has spent actually performing computation of some sort. Waiting on I/O doesn't count. Sleeping (more precisely, sleep()ing) doesn't count either.

That's why you probably got a duration of 0 seconds.

If you want a simple measure of elapsed time, see:

Code:

man 2 time

If you want something almost as simple but more precise, see:

Code:

man 2 gettimeofday

Hope this helps.