Date: Wed, 17 Jul 2002 14:35:26 -0600 From: "Andrei Cojocaru" <spinlock_lists@empirequest.com> To: "Darren Pilgrim" <dmp@pantherdragon.org> Cc: "Cy Schubert - CITS Open Systems Group" <Cy.Schubert@uumail.gov.bc.ca>, <freebsd-hackers@FreeBSD.ORG> Subject: Re: Counting the clock cycles Message-ID: <005f01c22dd1$7be7d180$0300a8c0@fivehundred> References: <200207171943.g6HJhf4o051526@cwsys.cwsent.com> <004801c22dce$859bfa60$0300a8c0@fivehundred> <3D35D2D0.F480C81D@pantherdragon.org>
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I am already synchronizing using xntp, that's not the problem. The = problem is by some weird way the clock got out of sync by about 1hr = during daylight switch on one of the computers I run, and I need a = reliable way to get passage of time (I don't need date/time, just the = passage of it) for different internal operations in the program. ----- Original Message -----=20 From: "Darren Pilgrim" <dmp@pantherdragon.org> To: "Andrei Cojocaru" <spinlock_lists@empirequest.com> Cc: "Cy Schubert - CITS Open Systems Group" = <Cy.Schubert@uumail.gov.bc.ca>; <freebsd-hackers@FreeBSD.ORG> Sent: Wednesday, July 17, 2002 14:25 Subject: Re: Counting the clock cycles > Andrei Cojocaru wrote: > >=20 > > doesn't fit my criteria since it changes, bah I'll just use > > gettimeofday since it's a portable API and hope the computers I run > > it on don't change their blocks by too much... >=20 > If you're really worried about it, get a GPS device that can provide > you with a PPS signal for use with ntpd. Then I'd say you could = safely > rely on the computer's clock being accurate. >=20 > > From: "Cy Schubert - CITS Open Systems Group" = <Cy.Schubert@uumail.gov.bc.ca> > > > In message <00d501c22dc4$57d08b00$0200a8c0@twothousand>, "Andrei > > > Cojocaru" writes: > > > > I was asking around in #freebsdhelp on EFNet what the equivalent = of > > > > GetTickCount() in the Win32 API is in FreeBSD. > > > > > > > > I need a way to properly determine passage of time that is not = affected if I > > > > change the system clock for example. The only way I'm aware that = you can do > > > > that is by counting the number of clock cycles since system = startup. What > > > > function does that in FreeBSD? I'd also like a Linux way if = possible. (that > > > > is a way that will work across all UNIX clones). Thanks and = please include > > > > my email in the reply directly since I'm not signed up to this = mailing list. > > > > Thanks once again. > > > > > > How about time(3)? > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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