On Thu, Nov 4, 2010 at 12:11 PM, Hans Petter Selasky <hsela...@c2i.net> wrote:
> On Thursday 04 November 2010 20:01:57 Matthew Fleming wrote:
>> On Thu, Nov 4, 2010 at 11:41 AM, Hans Petter Selasky <hsela...@c2i.net>
>> > 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:
>> 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?)
> At first look I see that I need a non-blocking version of:
> At the point in the code where these functions are called I cannot block. Is
> this impossible to implement?
It depends on whether the queue uses a MTX_SPIN or MTX_DEF. It is not
possible to determine whether a task is running without taking the
taskqueue lock. And it is certainly impossible to dequeue a task
without the lock that was used to enqueue it.
However, a variant that dequeued if the task was still pending, and
returned failure otherwise (rather than sleeping) is definitely
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