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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 18:28:11 2001" -->
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<!-- name="Karl Heinz Kremer" -->
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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=<20010702213529.A21048@khk.net>"><EM>khk@khk.net</EM></A>)<BR>
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<STRONG>Date:</STRONG> Mon Jul 02 2001 - 18:35:29 PDT
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0032.html">Marcio Luis Teixeira: "Need help building a new SANE driver"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0030.html">Matt: "Re: Compiling problems on Redhat 7.0"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0020.html">Oliver Rauch: "Re: What's the status of sanei-thread?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0040.html">Oliver Rauch: "Re: What's the status of sanei-thread?"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0040.html">Oliver Rauch: "Re: What's the status of sanei-thread?"</A>
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<P>
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On Mon, Jul 02, 2001 at 11:16:24PM +0200, Oliver Rauch wrote:
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<BR>
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<EM>> Is there no driver based command queueing for USB?
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</EM><BR>
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<P>Not for the scanner driver, or at least not without modifications
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<BR>
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to the scanner driver.
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<BR>
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<P><EM>> Also if there is no queueing, you can do:
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> 1) read on buffer1
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</EM><BR>
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<EM>> 2) initiate read of buffer2
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</EM><BR>
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<EM>> 3) sane_read can get buffer1, when buffer1
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</EM><BR>
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<EM>> is empty wait until buffer2 is read (should already
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</EM><BR>
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<EM>> be done) and initiate read of buffer1 again.
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</EM><BR>
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<EM>> etc.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> There are two problems with the reader_process
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</EM><BR>
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<EM>> 1) fork does not work on all systems
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</EM><BR>
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<P>My plan actually was to make this a compile time option so that the
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<BR>
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original non-read-process version would still be available.
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<BR>
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<P><EM>> 2) the pipe as IPC is not very good because the
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</EM><BR>
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<EM>> buffer is very small (about 4KB on most systems).
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</EM><BR>
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<EM>> This can(unnecessaryly) slow down scanning on slow
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</EM><BR>
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<EM>> systems.
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</EM><BR>
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<P>Pipes are not the only IPC mechanism. Shared memory would probably be
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<BR>
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a lot faster. This of course may open up a totally different can of
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<BR>
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incompatibility worms.
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<BR>
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<P>Do you have any comparison data between a non-threaded and the threaded
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<BR>
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approach?
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<BR>
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<P>What was the original idea behind implementing the second process in
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<BR>
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some of the backends?
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<BR>
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<P>Karl Heinz
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<BR>
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<P><PRE>
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--
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Karl Heinz Kremer <A HREF="mailto:khk@khk.net?Subject=Re:%20What's%20the%20status%20of%20sanei-thread?&In-Reply-To=<20010702213529.A21048@khk.net>">khk@khk.net</A>
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PGP Key at <A HREF="http://www.freecolormanagement.com/download/khk.asc">http://www.freecolormanagement.com/download/khk.asc</A>
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EPSON Sane Backend: <A HREF="http://www.freecolormanagement.com">http://www.freecolormanagement.com</A>
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<P>
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</PRE>
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<HR NOSHADE>
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<UL>
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<LI>application/pgp-signature attachment: <A HREF="att-0031/01-part">stored</A>
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</UL>
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<!-- attachment="01-part" -->
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<P><PRE>
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--
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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=<20010702213529.A21048@khk.net>">majordomo@mostang.com</A>
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</PRE>
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<!-- next="start" -->
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<LI><STRONG>Next message:</STRONG> <A HREF="0032.html">Marcio Luis Teixeira: "Need help building a new SANE driver"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0030.html">Matt: "Re: Compiling problems on Redhat 7.0"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0020.html">Oliver Rauch: "Re: What's the status of sanei-thread?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0040.html">Oliver Rauch: "Re: What's the status of sanei-thread?"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0032.html">Marcio Luis Teixeira: "Need help building a new SANE driver"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0040.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 - 18:30:38 PDT</EM>
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