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From: Hans Petter Selasky <hselasky@c2i.net>
To: Matthew Fleming <mdf356@gmail.com>
Date: Thu, 4 Nov 2010 20:11:44 +0100
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Cc: John Baldwin <jhb@freebsd.org>, Weongyo Jeong <weongyo.jeong@gmail.com>,
	freebsd-current@freebsd.org, freebsd-usb@freebsd.org,
	freebsd-arch@freebsd.org
Subject: Re: [RFC] Outline of USB process integration in the kernel
	taskqueue system
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On Thursday 04 November 2010 20:01:57 Matthew Fleming wrote:
> On Thu, Nov 4, 2010 at 11:41 AM, Hans Petter Selasky <hselasky@c2i.net> 
wrote:
> > On Thursday 04 November 2010 15:29:51 John Baldwin wrote:
> >>  (and there is in Jeff's OFED branch)
> > 
> > Is there a link to this branch? I would certainly have a look at his work
> > and re-base my patch.
> 
> It's on svn.freebsd.org:
> 
> http://svn.freebsd.org/viewvc/base/projects/ofed/head/sys/kern/subr_taskque
> ue.c?view=log
> http://svn.freebsd.org/viewvc/base?view=revision&revision=209422
> 
> For the purpose of speed, I'm not opposed to breaking the KBI by using
> a doubly-linked TAILQ, but I don't think the difference will matter
> all that often (perhaps I'm wrong and some taskqueues have dozens of
> pending tasks?)
> 
> Thanks,
> matthew

At first look I see that I need a non-blocking version of:

taskqueue_cancel(

At the point in the code where these functions are called I cannot block. Is 
this impossible to implement?

--HPS