* Zhiui Zhang <[EMAIL PROTECTED]> [001103 10:08] wrote:
>
>
> On Fri, 3 Nov 2000, Poul-Henning Kamp wrote:
>
> > In message <Pine.SOL.4.21.0011031156050.29568-100000@jade>, Zhiui Zhang writes:
> > >
> > >The manual says the granularity of gettimeofday() is hardware dependent.
> > >The time may be updated continuously or in clock ticks. Can anyone
> > >explain for me the two different ways of updating the time? What kind of
> > >hardware can help?
> >
> > You probably need to tell me what you need first...
>
> This is actually a question from the book "Kernel Project for Linux" and I
> am a TA for an operating system course that uses this textbook. I know a
> little bit of NTP and Intel Time stamp counter. I need an authoritive
> answer for this question because I do not have the time to go through the
> FreeBSD code to find out myself in a short time. My impression is that if
> the time is updated by an interrupt handler per tick, it can not get a
> microsecond granularity.
Gettimeofday will force a check of the system hardware, basically
you should get better than 100HZ resolution with gettimeofday.
--
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"I have the heart of a child; I keep it in a jar on my desk."
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