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<TITLE>sane-devel: Re: 1.0.3 snapscan interface</TITLE>
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<META NAME="Author" CONTENT="abel deuring (a.deuring@satzbau-gmbh.de)">
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<META NAME="Subject" CONTENT="Re: 1.0.3 snapscan interface">
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<H1>Re: 1.0.3 snapscan interface</H1>
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<!-- received="Mon Sep 25 02:19:49 2000" -->
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<!-- name="abel deuring" -->
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<!-- subject="Re: 1.0.3 snapscan interface" -->
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<!-- inreplyto="02b001c0268c$3aed96e0$bf0aa8c0@dufusiii" -->
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<STRONG>From:</STRONG> abel deuring (<A HREF="mailto:a.deuring@satzbau-gmbh.de?Subject=Re:%201.0.3%20snapscan%20interface&In-Reply-To=<39CF1DD1.8FD066CF@satzbau-gmbh.de>"><EM>a.deuring@satzbau-gmbh.de</EM></A>)<BR>
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<STRONG>Date:</STRONG> Mon Sep 25 2000 - 02:41:37 PDT
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<LI><STRONG>Next message:</STRONG> <A HREF="0256.html">Graham Leggett: "Some help with the net backend"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0254.html">mh: "pnm backend crashes graphical frontends (patch?)"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0251.html">Lawrence Glaister: "1.0.3 snapscan interface"</A>
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Lawrence Glaister wrote:
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<P><EM>> I just tried a usleep(2000) and a continue added into the EAGAIN condition
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</EM><BR>
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<EM>> in FDSource_get() instead of the break, and restored the code in
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</EM><BR>
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<EM>> RGBRouter_get(). This does seem to work. I noticed that the scanner does
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</EM><BR>
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<EM>> "backtrack" occasionally on large scans and this coincides perfectly with
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</EM><BR>
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<EM>> hitting the EAGAIN condition. It looks like the scanner is responding to usb
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</EM><BR>
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<EM>> read requests with a "try again later" and these are getting passed back up
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</EM><BR>
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<EM>> the chain... it is possible that other versions of usb kernel code will
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</EM><BR>
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<EM>> block on a read() until data is ready instead of returning with EAGAIN. I
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</EM><BR>
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<EM>> don't know what the scsi driver does, but if the reads dont return until
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</EM><BR>
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<EM>> data is available or an error occurs, this would explain the problems I have
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</EM><BR>
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<EM>> been seeing.
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</EM><BR>
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<P>The sanei_scsi layer "catches" the EAGAIN error that can happen in the
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<BR>
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write part of sanei_scsi_cmd; for reading a command's result data,
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sanei_scsi uses a blocking read call.
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<BR>
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<P>Abel
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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:%201.0.3%20snapscan%20interface&In-Reply-To=<39CF1DD1.8FD066CF@satzbau-gmbh.de>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0256.html">Graham Leggett: "Some help with the net backend"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0254.html">mh: "pnm backend crashes graphical frontends (patch?)"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0251.html">Lawrence Glaister: "1.0.3 snapscan interface"</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 Sep 25 2000 - 02:20:19 PDT</EM>
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