From owner-freebsd-hackers Wed Jul 17 13:35:31 2002 Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 5D77F37B400 for ; Wed, 17 Jul 2002 13:35:28 -0700 (PDT) Received: from mail.empirequest.com (www.empirequest.com [216.126.10.210]) by mx1.FreeBSD.org (Postfix) with ESMTP id 9373F43E42 for ; Wed, 17 Jul 2002 13:35:27 -0700 (PDT) (envelope-from spinlock_lists@empirequest.com) Received: (qmail 7432 invoked by uid 89); 17 Jul 2002 20:35:27 -0000 Received: from unknown (HELO fivehundred) (spinlock?lists@empirequest.com@192.168.0.3) by www.empirequest.com with SMTP; 17 Jul 2002 20:35:27 -0000 Message-ID: <005f01c22dd1$7be7d180$0300a8c0@fivehundred> From: "Andrei Cojocaru" To: "Darren Pilgrim" Cc: "Cy Schubert - CITS Open Systems Group" , References: <200207171943.g6HJhf4o051526@cwsys.cwsent.com> <004801c22dce$859bfa60$0300a8c0@fivehundred> <3D35D2D0.F480C81D@pantherdragon.org> Subject: Re: Counting the clock cycles Date: Wed, 17 Jul 2002 14:35:26 -0600 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 5.50.4807.1700 X-MIMEOLE: Produced By Microsoft MimeOLE V5.50.4910.0300 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG 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" To: "Andrei Cojocaru" Cc: "Cy Schubert - CITS Open Systems Group" = ; 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" = > > > 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