Date: Mon, 29 Aug 2011 17:23:15 -0700 From: John-Mark Gurney <jmg@funkthat.com> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: freebsd-current@freebsd.org Subject: Re: kqueue and device driver experience anyone ? Message-ID: <20110830002315.GD3098@funkthat.com> In-Reply-To: <20110826210101.GA5822@onelab2.iet.unipi.it> References: <20110826153940.GA3800@onelab2.iet.unipi.it> <201108261313.03441.jhb@freebsd.org> <20110826210101.GA5822@onelab2.iet.unipi.it>
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Luigi Rizzo wrote this message on Fri, Aug 26, 2011 at 23:01 +0200:
> The other thing i need (but i believe i know how to handle it)
> is tell whether .f_event() is called by KNOTE() or by kqueue_scan(),
> but i believe i can use the "hint" argument to tell the two.
Why do you need to know the difference? kqueue is a level triggered
API, and so should behave the same if it is called from KNOTE or
kqueue_scan... The reason it is called from kqueue_scan is to ensure
that the condition (level) still exists, and to get updated data
information (like how many bytes are available for reading)...
--
John-Mark Gurney Voice: +1 415 225 5579
"All that I will do, has been done, All that I have, has not."
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