Date: Thu, 19 Mar 2009 15:45:19 -0700 From: Julian Elischer <julian@elischer.org> To: barney_cordoba@yahoo.com Cc: freebsd-current@freebsd.org, current@freebsd.org Subject: Re: Is there a delay which yields? Message-ID: <49C2CAFF.8040805@elischer.org> In-Reply-To: <258770.46329.qm@web63908.mail.re1.yahoo.com> References: <258770.46329.qm@web63908.mail.re1.yahoo.com>
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Barney Cordoba wrote: > > > > --- On Thu, 3/19/09, John Baldwin <jhb@freebsd.org> wrote: > >> From: John Baldwin <jhb@freebsd.org> >> Subject: Re: Is there a delay which yields? >> To: freebsd-current@freebsd.org, barney_cordoba@yahoo.com >> Cc: "Julian Elischer" <julian@elischer.org>, current@freebsd.org >> Date: Thursday, March 19, 2009, 11:23 AM >> On Sunday 15 March 2009 2:43:18 pm Barney Cordoba wrote: >>> --- On Sun, 3/15/09, Julian Elischer >> <julian@elischer.org> wrote: >>>> From: Julian Elischer <julian@elischer.org> >>>> Subject: Re: Is there a delay which yields? >>>> To: barney_cordoba@yahoo.com >>>> Cc: current@freebsd.org >>>> Date: Sunday, March 15, 2009, 1:16 PM >>>> Barney Cordoba wrote: >>>>> I'd expect DELAY to yield till timeout >> but a task >>>> with a delay loop just >>>>> runs to 100% usage. Is there a function >> which can >>>> yield exectution for >>>>> a set amount of time (without having to use >> a timer)? >>>> DELAY is designe for use early in the boot when >> thre are no >>>> timers. >>>> it is only occasionally used for cases during >> normal >>>> operation. >>>> >>>> how would a thread know how long it has been away >> if no >>>> timer is used? >>> >>> I guess I mean a sleep. >>> >>> Also, this is a kernel driver. I have a device >>> which requires a toggle with a 10ms delay between >> pulses. I hate to >>> tie up the cpu for 10ms with a delay. Sort of like the >> following: >>> write_pulse(); >>> delay(10000); >>> write_pulse(); >> Use pause(9). >> > > timo is in hz? So 1/1000th of a second by default? > > Also, I notice that hz is 1000 but get 2000 ints/second per > cpu. Why is it twice hz? how many cpus do you have? > > Barney > > > > _______________________________________________ > freebsd-current@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org"
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