--- On Thu, 3/19/09, John Baldwin <jhb_at_freebsd.org> wrote: > From: John Baldwin <jhb_at_freebsd.org> > Subject: Re: Is there a delay which yields? > To: freebsd-current_at_freebsd.org, barney_cordoba_at_yahoo.com > Cc: "Julian Elischer" <julian_at_elischer.org>, current_at_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_at_elischer.org> wrote: > > > > > From: Julian Elischer <julian_at_elischer.org> > > > Subject: Re: Is there a delay which yields? > > > To: barney_cordoba_at_yahoo.com > > > Cc: current_at_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? BarneyReceived on Thu Mar 19 2009 - 21:29:29 UTC
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