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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