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Old 02-14-2007, 05:06 AM   #1
totaljj
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Registered: Nov 2006
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using sleep() and time() commands together in c++


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.
 
Old 02-14-2007, 07:12 AM   #2
wjevans_7d1@yahoo.co
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Registered: Jun 2006
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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.

Last edited by wjevans_7d1@yahoo.co; 02-14-2007 at 07:13 AM.
 
  


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