Date: Wed, 17 Jul 2002 12:15:45 -0700 From: Terry Lambert <tlambert2@mindspring.com> To: Andrei Cojocaru <spinlock_lists@empirequest.com> Cc: freebsd-hackers@freebsd.org Subject: Re: Counting the clock cycles Message-ID: <3D35C261.1ED2AC46@mindspring.com> References: <00d501c22dc4$57d08b00$0200a8c0@twothousand>
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Andrei Cojocaru wrote: > 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. Use the Pentium Cycle Counter. Note that power management is going to make it inaccurate as a time base. Give up on the idea that you will have a wall time that is more accurate than the CMOS clock; after you've embraced that, you can learn to stop worrying and love Intel. -- Terry To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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