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From: Hans Petter Selasky <hselasky@c2i.net>
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Date: Fri, 5 Nov 2010 20:00:37 +0100
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Cc: freebsd-current@freebsd.org, Matthew Fleming <mdf356@gmail.com>,
	freebsd-usb@freebsd.org, Weongyo Jeong <weongyo.jeong@gmail.com>
Subject: Re: [RFC] Outline of USB process integration in the kernel
	taskqueue system
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On Friday 05 November 2010 19:48:05 Matthew Fleming wrote:
> On Fri, Nov 5, 2010 at 11:45 AM, Hans Petter Selasky <hselasky@c2i.net> 
wrote:
> > On Friday 05 November 2010 19:39:45 Matthew Fleming wrote:
> >> True, but no taskqueue(9) code can handle that.  Only the caller can
> >> prevent a task from becoming enqueued again.  The same issue exists
> >> with taskqueue_drain().
> > 
> > I find that strange, because that means if I queue a task again while it
> > is running, then I doesn't get run? Are you really sure?
> 
> If a task is currently running when enqueued, the task struct will be
> re-enqueued to the taskqueue.  When that task comes up as the head of
> the queue, it will be run again.

Right, and the taskqueue_cancel has to cancel in that state to, but it doesn't 
because it only checks pending if !running() :-) ??

--HPS