Date: Fri, 12 Aug 2011 14:29:18 +0530 From: Ninad Adi <adi.ninad@gmail.com> To: Julian Elischer <julian@freebsd.org> Cc: "freebsd-threads@freebsd.org" <freebsd-threads@freebsd.org> Subject: Re: Urgent interrupt thread Message-ID: <CAEOZPkYHZ2J12OpY-hz6yMH0V%2B2B7EN3ws5Z9kVizYpNtvo5nA@mail.gmail.com> In-Reply-To: <4E44E326.9070405@freebsd.org> References: <CAEOZPkYPQeBv7t0vUDN%2BY6jXUQ6HdK7eJb05gfXNUwb49Wphag@mail.gmail.com> <4E44CBA6.9050809@freebsd.org> <CAEOZPkbi0vvvASpnf_wLqrfPCUTTRp_yr5b%2B6pOW=WZdTgR--Q@mail.gmail.com> <4E44E326.9070405@freebsd.org>
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Thanks for your prompt replies sir, just one more clarification the routine bus_setup_intr has 5th arg of type driver_intr_t ithread then if I am not wrong my isr is running as a thread, probably thats the reason why latest drivers dont use Deferring mechanism like iwi, iwn, ral. However Atheros is still using taskqueues which is considerably old I suppose. So using filter+ithread model without deferring Should be fine. Plz let me know your opinions on the same, It would help me understand freebsd better. Will not disturb you more. Awaiting,reply Thanks a lot, Ninad Adi. On Friday, August 12, 2011, Julian Elischer <julian@freebsd.org> wrote: > On 8/12/11 12:45 AM, Ninad Adi wrote: > > So in the routine bus_setup_intr the isr runs as > ithread but then if its a thread why its not allowed to sleep it aquires mutex lock , disables > all interrupts and continues. > > > if it is running as an ithread it can do those things. > if it is running as a fast interrupt handler it can't. > the driver sets how the code is to be run > > > > My last question is in that case do we need to > Use taskqueues or we can completely write the > Isr in one thread itself without using deferring > Primitives. I.e can we refrain from using deferring mechanism. > > if you use an ithread you can do what you want.. > > http://www.unix.com/man-page/FreeBSD/9/ithread/ > > > > > awaiting the reply. > > Ninad Adi. > > > On Friday, August 12, 2011, Julian Elischer <julian@freebsd.org> wrote: >> On 8/11/11 3:13 AM, Ninad Adi wrote: >>> >>> To, >>> Freebsd greats, >>> >>> Dear sirs, >>> In freebsd 8.2 kernel architecture >>> Do interrupt handlers run as threads by >>> default or do they run in interrupt context ?? >>> >>> Ninad. >>> Freebsd developer. >>> _______________________________________________ >>> freebsd-threads@freebsd.org mailing list >>> http://lists.freebsd.org/mailman/listinfo/freebsd-threads < http://lists.freebsd.org/mailman/listinfo/freebsd-threads>; >>> To unsubscribe, send any mail to " freebsd-threads-unsubscribe@freebsd.org" >>> >> you have the choice to do either. >> >> >> key words to look up are 'fast' interrupts and "interrrupt threads" >> >> I've not used either for many years. so I hope that helps enough that you can find hte right answer. >> >> >> >> >
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