lkml.org 
[lkml]   [2002]   [Feb]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: schedule()
On Tue, 26 Feb 2002, Davide Libenzi wrote:

> On Tue, 26 Feb 2002, Richard B. Johnson wrote:
>
> >
> >
> > I just read on this list that:
> >
> > while(something)
> > {
> > current->policy |= SCHED_YIELD;
> > schedule();
> > }
> >
> > Will no longer be allowed in a kernel module! If this is true, how
> > do I loop, waiting for a bit in a port, without wasting CPU time?
> >
> > A lot of hardware does not generate interrupts upon a condition,
> > there is no CPU activity that could send a wake_up_interruptible()
> > to something sleeping.
> >
> > For instance, I need to write data to a hardware FIFO, one long-word
> > at a time, but I can't just write. I have to wait for a bit to be
> > set or reset for each and every write. I'm going to be burning a
> > lot of CPU cycles if I can't schedule() while the trickle-down-effect
> > of the hardware is happening.
>
> What did it do yield() to you ? Doesn't it work for your case ?
>
There isn't one in 2.4.x I'll modify my drivers to use YIELD
and #define it depending upon version.


Cheers,
Dick Johnson

Penguin : Linux version 2.4.1 on an i686 machine (797.90 BogoMips).

111,111,111 * 111,111,111 = 12,345,678,987,654,321

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:24    [W:0.053 / U:7.260 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site