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<TITLE>sane-devel: Re: backend fork/reader-process <-> sane_read</TITLE>
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<META NAME="Author" CONTENT="Matto Marjanovic (maddog@mir.com)">
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<META NAME="Subject" CONTENT="Re: backend fork/reader-process <-> sane_read">
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<H1>Re: backend fork/reader-process <-> sane_read</H1>
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<!-- subject="Re: backend fork/reader-process <-> sane_read" -->
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<STRONG>From:</STRONG> Matto Marjanovic (<A HREF="mailto:maddog@mir.com?Subject=Re:%20backend%20fork/reader-process%20<->%20sane_read&In-Reply-To=<E12MuPW-0003Tt-00@yoo-hoo.ai.mit.edu>"><EM>maddog@mir.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Mon Feb 21 2000 - 07:06:06 PST
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<LI><STRONG>Next message:</STRONG> <A HREF="0263.html">Jonathan Buzzard: "Re: Epson Backend - The Millenium Release"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0261.html">Karl Heinz Kremer: "Re: Epson Backend - The Millenium Release"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0258.html">abel deuring: "Re: backend fork/reader-process <-> sane_read"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0264.html">Oliver Rauch: "Re: backend fork/reader-process <-> sane_read"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0264.html">Oliver Rauch: "Re: backend fork/reader-process <-> sane_read"</A>
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I just wanted to throw in my two cents on this, because I haven't heard
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<BR>
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something that I expected to hear in the whole thread on this issue....
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<BR>
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<P>It's been my understanding that, originally, all the forking around in
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<BR>
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the backends was in order to implement asynchronous I/O, and the intent
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<BR>
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of asynchronous I/O (and sane_set_io_mode()) was not to tune the scanner
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<BR>
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speed, but to improve GUI response. Under async I/O, the GUI/frontend
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<BR>
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would not block while waiting for the backend to deliver a full buffer
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<BR>
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of data.
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<BR>
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<P>Obviously, all the extra copying that goes on with sending scanlines
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<BR>
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from one process to another via pipes is not an efficiency gain, and
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<BR>
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that is kind of why I haven't bothered jumping through the hoops to
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<BR>
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add async I/O to the microtek backend. (But, my scanner also seems
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<BR>
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to have bigger buffers than some other scanners out there -- Hah-hah!
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<BR>
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At least they did *something* right.)
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<BR>
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<P>-matt m.
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<BR>
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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:%20backend%20fork/reader-process%20<->%20sane_read&In-Reply-To=<E12MuPW-0003Tt-00@yoo-hoo.ai.mit.edu>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0263.html">Jonathan Buzzard: "Re: Epson Backend - The Millenium Release"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0261.html">Karl Heinz Kremer: "Re: Epson Backend - The Millenium Release"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0258.html">abel deuring: "Re: backend fork/reader-process <-> sane_read"</A>
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<LI><STRONG>Next in thread:</STRONG> <A HREF="0264.html">Oliver Rauch: "Re: backend fork/reader-process <-> sane_read"</A>
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<LI><STRONG>Reply:</STRONG> <A HREF="0264.html">Oliver Rauch: "Re: backend fork/reader-process <-> sane_read"</A>
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