Re: [tlug] using rusage

[Edward Middleton <emiddleton@example.com>]

Josh Glover wrote:
> 2008/6/20 Curt Sampson <cjs@example.com>:
>   
> > And why do you think nanosleep will get you closer than sleep?
> >     
>
> Again, from Stevens (if my flaky memory serves), I seem to remember
> that some Unices gave you worse resolution for sleep(3) than for
> usleep(2) or nanosleep(3).
>   

Well the relevant Stevens quotes would be from 10.19. sleep Function

 "As with an alarm signal, the actual return may be at a time later 
than requested, because of other system activity."

 "FreeBSD 5.2.1, Linux 2.4.22, and Mac OS X 10.3, on the other hand, 
use another technique: the delay is provided by nanosleep(2)."

Even if the resolution where higher there is no guarantee that it will 
be scheduled immediately after becoming runnable.

Edward