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<TITLE>sane-devel: Re: What's the status of sanei-thread?</TITLE>
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<META NAME="Author" CONTENT="Karl Heinz Kremer (khk@khk.net)">
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<META NAME="Subject" CONTENT="Re: What's the status of sanei-thread?">
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<H1>Re: What's the status of sanei-thread?</H1>
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<!-- received="Mon Jul 2 11:53:23 2001" -->
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<!-- isosent="20010702190034" -->
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<!-- name="Karl Heinz Kremer" -->
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<!-- subject="Re: What's the status of sanei-thread?" -->
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<STRONG>From:</STRONG> Karl Heinz Kremer (<A HREF="mailto:khk@khk.net?Subject=Re:%20What's%20the%20status%20of%20sanei-thread?&In-Reply-To=<20010702190034.B11FB4E836@specht.khk.net>"><EM>khk@khk.net</EM></A>)<BR>
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<STRONG>Date:</STRONG> Mon Jul 02 2001 - 12:00:34 PDT
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<LI><STRONG>Next message:</STRONG> <A HREF="0019.html">DStevenson: "Re: Kernel 2.4.X and HP Scanjet 6300C"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0017.html">Tim Waugh: "Re: Kernel 2.4.X and HP Scanjet 6300C"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0015.html">Oliver Rauch: "Re: What's the status of sanei-thread?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0077.html">Henning Meier-Geinitz: "Re: What's the status of sanei-thread?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0020.html">Oliver Rauch: "Re: What's the status of sanei-thread?"</A>
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This does not work for USB. For consumer scanners USB is becomming
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<BR>
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more and more important, also the cheaper a scanner is, the more
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<BR>
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has to be done in software. Running two processes, one to get the
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<BR>
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data and the other one to process the data seems to be the ideal
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<BR>
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solution to improve the throughput.
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<BR>
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<P>So I'll pass on this one.
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<BR>
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<P>Karl Heinz
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<BR>
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<P>Oliver Rauch <<A HREF="mailto:oliver.rauch@rauch-domain.de?Subject=Re:%20What's%20the%20status%20of%20sanei-thread?&In-Reply-To=<20010702190034.B11FB4E836@specht.khk.net>">oliver.rauch@rauch-domain.de</A>> said:
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<BR>
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<P><EM>> Karl Heinz Kremer wrote:
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</EM><BR>
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<EM>> >
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</EM><BR>
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<EM>> > I am in the process of adding a reader thread to the EPSON backend.
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</EM><BR>
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<EM>> > I noticed that the library module sanei-thread does some of the
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</EM><BR>
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<EM>> > work that's necessary to create a reader process in a somehow
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</EM><BR>
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<EM>> > cross-platform way (at least for any OS that supports fork() and
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</EM><BR>
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<EM>> > OS/2). I also noticed that no backend is using these functions.
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</EM><BR>
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<EM>> > What's the status of this module?
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> I thought about the reader_process thing and I think there is a
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</EM><BR>
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<EM>> chance that we do not need it:
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</EM><BR>
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<EM>> most (all?) scsi controller drivers (and some controllers in hardware)
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</EM><BR>
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<EM>> do support scsi command queueing. When the queueing is done with
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</EM><BR>
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<EM>> 2 scsi read commands and 2 scsi buffers who are handled a bit smart
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</EM><BR>
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<EM>> in sane_read() we (may be) do not need the reader_process
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</EM><BR>
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<EM>> and may be get better performence because we do not need the
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</EM><BR>
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<EM>> pipe between the reader_process and the main process.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> May be you like to try this idea.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Bye
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</EM><BR>
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<EM>> Oliver
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> --
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</EM><BR>
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<EM>> Homepage: <A HREF="http://www.rauch-domain.de">http://www.rauch-domain.de</A>
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</EM><BR>
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<EM>> sane-umax: <A HREF="http://www.rauch-domain.de/sane-umax">http://www.rauch-domain.de/sane-umax</A>
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</EM><BR>
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<EM>> xsane: <A HREF="http://www.xsane.org">http://www.xsane.org</A>
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</EM><BR>
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<EM>> E-Mail: mailto:<A HREF="mailto:Oliver.Rauch@rauch-domain.de?Subject=Re:%20What's%20the%20status%20of%20sanei-thread?&In-Reply-To=<20010702190034.B11FB4E836@specht.khk.net>">Oliver.Rauch@rauch-domain.de</A>
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> --
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</EM><BR>
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<EM>> Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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</EM><BR>
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<EM>> To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20What's%20the%20status%20of%20sanei-thread?&In-Reply-To=<20010702190034.B11FB4E836@specht.khk.net>">majordomo@mostang.com</A>
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</EM><BR>
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<EM>>
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</EM><BR>
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<P><P><P><PRE>
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--
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<P><P><P><P>--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%20What's%20the%20status%20of%20sanei-thread?&In-Reply-To=<20010702190034.B11FB4E836@specht.khk.net>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0019.html">DStevenson: "Re: Kernel 2.4.X and HP Scanjet 6300C"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0017.html">Tim Waugh: "Re: Kernel 2.4.X and HP Scanjet 6300C"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0015.html">Oliver Rauch: "Re: What's the status of sanei-thread?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0077.html">Henning Meier-Geinitz: "Re: What's the status of sanei-thread?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0020.html">Oliver Rauch: "Re: What's the status of sanei-thread?"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Mon Jul 02 2001 - 11:54:05 PDT</EM>
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