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<TITLE>sane-devel: RE: Backend: When to use reader process?</TITLE>
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<META NAME="Author" CONTENT="Davis, Tom (Tom.Davis@minolta-qms.com)">
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<META NAME="Subject" CONTENT="RE: Backend: When to use reader process?">
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<H1>RE: Backend: When to use reader process?</H1>
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<!-- received="Wed Feb 28 08:33:37 2001" -->
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<!-- isoreceived="20010228163337" -->
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<!-- sent="Wed, 28 Feb 2001 10:46:25 -0600" -->
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<!-- isosent="20010228164625" -->
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<!-- name="Davis, Tom" -->
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<!-- email="Tom.Davis@minolta-qms.com" -->
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<!-- subject="RE: Backend: When to use reader process?" -->
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<!-- id="3D0DF647212CD411B0990008C786947C765861@qms-ex01" -->
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<!-- inreplyto="Backend: When to use reader process?" -->
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<STRONG>From:</STRONG> Davis, Tom (<A HREF="mailto:Tom.Davis@minolta-qms.com?Subject=RE:%20Backend:%20When%20to%20use%20reader%20process?&In-Reply-To=<3D0DF647212CD411B0990008C786947C765861@qms-ex01>"><EM>Tom.Davis@minolta-qms.com</EM></A>)<BR>
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<STRONG>Date:</STRONG> Wed Feb 28 2001 - 08:46:25 PST
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<LI><STRONG>Previous message:</STRONG> <A HREF="0253.html">Frederik Ramm: "Backend: When to use reader process?"</A>
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<P>
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This is probably a good model for most scanners, since the task division
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<BR>
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appears to separate an I/O intensive task (acquiring the scan data) from a
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<BR>
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CPU intensive task (whatever processes the sane_read() data... often a
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<BR>
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compression task).
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<BR>
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<P>Tom Davis
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<BR>
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<P>-----Original Message-----
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<BR>
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From: Frederik Ramm [mailto:<A HREF="mailto:frederik@remote.org?Subject=RE:%20Backend:%20When%20to%20use%20reader%20process?&In-Reply-To=<3D0DF647212CD411B0990008C786947C765861@qms-ex01>">frederik@remote.org</A>]
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<BR>
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Sent: Wednesday, February 28, 2001 10:23 AM
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<BR>
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To: <A HREF="mailto:sane-devel@mostang.com?Subject=RE:%20Backend:%20When%20to%20use%20reader%20process?&In-Reply-To=<3D0DF647212CD411B0990008C786947C765861@qms-ex01>">sane-devel@mostang.com</A>
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<BR>
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Subject: Backend: When to use reader process?
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<BR>
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<P><P>Hi,
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<BR>
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<P> I've noticed that the driver I am basing my M3091 work on, the
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<BR>
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M3096 driver which was in turn derived from the Coolscan driver, uses
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<BR>
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a separate process for reading data from the scanner, which is then
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<BR>
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fed via a pipe file descriptor to sane_read.
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<BR>
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<P>Other drivers (like the Bell+Howell backend I've been looking at for
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<BR>
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duplex inspiration) don't use a separate process.
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<BR>
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<P>Which would be the preferred way to implement it for a max. 15ppm ADF
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<BR>
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scanner?
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<BR>
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<P>Bye
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<BR>
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Frederik
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<BR>
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<P><PRE>
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--
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Frederik Ramm ## eMail <A HREF="mailto:frederik@remote.org?Subject=RE:%20Backend:%20When%20to%20use%20reader%20process?&In-Reply-To=<3D0DF647212CD411B0990008C786947C765861@qms-ex01>">frederik@remote.org</A> ## N57<35>48.10' W005<30>40.32'
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<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:%20Backend:%20When%20to%20use%20reader%20process?&In-Reply-To=<3D0DF647212CD411B0990008C786947C765861@qms-ex01>">majordomo@mostang.com</A>
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<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:%20Backend:%20When%20to%20use%20reader%20process?&In-Reply-To=<3D0DF647212CD411B0990008C786947C765861@qms-ex01>">majordomo@mostang.com</A>
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</PRE>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Wed Feb 28 2001 - 08:34:50 PST</EM>
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