Date: Sun, 15 Mar 2009 11:43:18 -0700 (PDT) From: Barney Cordoba <barney_cordoba@yahoo.com> To: Julian Elischer <julian@elischer.org> Cc: current@freebsd.org Subject: Re: Is there a delay which yields? Message-ID: <808304.73330.qm@web63904.mail.re1.yahoo.com> In-Reply-To: <49BD37FB.7060101@elischer.org>
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--- 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();
Barney
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