Date: Mon, 08 Apr 1996 11:48:27 -0700 From: "Amancio Hasty Jr." <hasty@rah.star-gate.com> To: Thomas Roell <roell@blah.a.isar.de> Cc: Terry Lambert <terry@lambert.org>, msmith@atrad.adelaide.edu.au, hackers@FreeBSD.org, jkh@time.cdrom.com, roell@xinside.com Subject: Re: The F_SETOWN problem.. Message-ID: <199604081848.LAA02562@rah.star-gate.com> In-Reply-To: Your message of "Mon, 08 Apr 1996 12:03:13 %2B0200." <199604081003.MAA00330@blah.a.isar.de>
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If you have a good idea and you encounter a lot of resistance
from this group it means that the group wants you to implement it 8)
Cheers,
Amancio
>>> Thomas Roell said:
> In your message of 7 April 1996 you write:
>
> > You can do the same thing without needing another process if you popen
> > a fipe and write events to yourself that can then be selected upon.
> >
> > THis might very well fix your buffering id 1K vs. 6k (5k pipe + 1k kernel)
> > is enough to fix the problem for you.
>
> I think you don't get it. The problem is no matter what I do, select()
> will be only called rarely, which means that a pipe would not help at
> all. Increasing the buffer size by any means just moves the problem to
> a different threshold, rather than solving it.
>
> Just another example. We are (aehm from the sales prespective will be)
> supporting HW-MPEG playback. The MPEG chip is fed with data
> asynchronously via periodical SIGALARM calls. It is easily possible
> that depending upon your bitstream, that for a while the X-Server will
> not get back to the select() at all.
>
> > > Right. This is what SVR4 (except Solaris), SCO and AIX are doing.
> >
> > Well. It seems that you really want a fix in another area of BSD,
> > and that this fix is just a software fix to the fact that the other
> > area is broken. 8-).
>
> What I want is being able to open multple /dev/ttyd* devices and get a
> SIGIO if there is new input available.
>
> - Thomas
> --
> Denver Office THOMAS ROELL /\ Das Reh springt hoc
h,
> +1(303)298-7478 X INSIDE INC / \/\ das Reh springt wei
t,
> 1801 Broadway, Suite 1710 / \ \/\ was soll es tu
n,
> Denver, CO 80202 roell@xinside.com / Oelch! \ \ es hat ja Zei
t.
>
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