From owner-freebsd-questions  Wed Jul 21 16:36:41 1999
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Date: Wed, 21 Jul 1999 19:33:18 -0400
From: Dutch Collins <dutch@charm.net>
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To: Jeff Hagendaz <jeffhdz@my-Deja.com>
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: polling in device driver
References: <BALPOCGFGEOOBAAA@my-deja.com>
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Jeff Hagendaz wrote:
> 
> Hi,
> 
> I asked this in -hackers, but didn't get an answer.
> Guess it is too simple to quanlify into -hackers,
> I am moving it here.  Your help is highly appreciated.
> 
> -- Jeff
> 
> Hi,
> 
> I am reading a Linux device driver.  At some point it
> polls a device to check if it is ready.  The timeout
> is set to 5 second.  It uses the system jiffies to
> count the time:
> 
>     u32 time_out = jiffies + 5 * HZ;
>     for (;;) {
>         /* code to check if dev is ready */
>         ........
>         if (ready) break;
>         if (intr_count == 0) schedule();
>         if (jiffies > time_out) return ERROR;
>     }
> 
> How do I implement such polling in FreeBSD?  Thanks.
> 
> --Jeff
> 
> --== Sent via Deja.com http://www.deja.com/ ==--
> Share what you know. Learn what you don't.
> 
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-- 
I can point you to some Linux-BSD hacker types at U. of Maryland
Baltimore County. These guys are good. Sometimes the local list gets
offtopic a little (yeah right).

umbclinux@lists.umbc.edu

-d


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