Is there a delay which yields?

[Barney Cordoba]

--- 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();


Barney