Date: Wed, 25 Aug 2004 13:14:47 -0400 From: John Baldwin <jhb@FreeBSD.org> To: freebsd-hackers@FreeBSD.org Cc: yangshazhou@hotmail.com Subject: Re: yield() in kernel CAN'T yield control for MOD_LOAD thread Message-ID: <200408251314.47962.jhb@FreeBSD.org> In-Reply-To: <BAY17-DAV11uCBcKfEx00001b48@hotmail.com> References: <BAY17-DAV11uCBcKfEx00001b48@hotmail.com>
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On Wednesday 25 August 2004 03:06 am, yangshazhou@hotmail.com wrote:
> Hi all,
> This problem delay me for quite a long time.
> I've built two klds, I'd like to see the result one's running to the
> other's. In one kld's MOD_LOAD subroutine, I make a long 'for' loop, in
> which it DELAY(1000) and then call yield(curthread,NULL). When the module
> was loaded by kldload, the system failed to response until the loop quit.
> The loop seems like that:
> for(i=0;i<8000;i++){
> ......
> DELAY(1000);
> yield(curthread,NULL);
> }
>
> My system is 5.2.1-release. Thanks.
You could try having the first one wait on a condition variable that the
second module's MOD_LOAD does a wakeup on.
--
John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve" = http://www.FreeBSD.org
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