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<TITLE>sane-devel: Re: Simultaneous Net Calls</TITLE>
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<META NAME="Author" CONTENT="Oliver Rauch (oliver.rauch@Wolfsburg.DE)">
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<META NAME="Subject" CONTENT="Re: Simultaneous Net Calls">
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<H1>Re: Simultaneous Net Calls</H1>
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<!-- name="Oliver Rauch" -->
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<!-- subject="Re: Simultaneous Net Calls" -->
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<!-- id="39CDC748.D30DAA41@wolfsburg.de" -->
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<STRONG>From:</STRONG> Oliver Rauch (<A HREF="mailto:oliver.rauch@Wolfsburg.DE?Subject=Re:%20Simultaneous%20Net%20Calls&In-Reply-To=<39CDC748.D30DAA41@wolfsburg.de>"><EM>oliver.rauch@Wolfsburg.DE</EM></A>)<BR>
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<STRONG>Date:</STRONG> Sun Sep 24 2000 - 02:20:08 PDT
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<LI><STRONG>Previous message:</STRONG> <A HREF="0237.html">Timothy Little: "Re: will my scanner work"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0227.html">Grega Bremec: "Simultaneous Net Calls"</A>
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<P>
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Grega Bremec wrote:
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<BR>
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<EM>>
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</EM><BR>
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<EM>> Hi all,
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> I must apologize in advance if this is a redundant question, but I was
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</EM><BR>
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<EM>> wondering to what extent is the net backend's behaviour defined for
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</EM><BR>
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<EM>> multiple "simultaneous" incoming requests to a single device?
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Does saned do any kind of resource locking, or is this entirely up to
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</EM><BR>
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<EM>> individual backends?
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> I did take a look at the network spec, but it doesn't seem to be
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</EM><BR>
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<EM>> covered in there, however I did not look at the source.
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</EM><BR>
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<EM>>
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</EM><BR>
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<P>Hi Grega,
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<BR>
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<P>I did not test this but as far as I see there is started a separate
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<BR>
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saned (strange, on my system it looks like two saned's are started)
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<BR>
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for each net connection.
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<BR>
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<P>This means that there sould be no difference between a
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<BR>
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net connection and a local connection to the backend.
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<BR>
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<P>The backends have to make sure that the device is reserved
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<BR>
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when a scan is started. For scsi scanners this is normally
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<BR>
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done by a "RESERVE_UNIT" call that makes sure that only
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<BR>
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the process that called "RESERVE_UNIT" can talk to the scanner,
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<BR>
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other processes get a DEVICE-BUSY or RESERVATION-CONFLICT-error.
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<BR>
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<P>bye
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<BR>
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Oliver
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<BR>
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<P><PRE>
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--
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Homepage: <A HREF="http://www.wolfsburg.de/~rauch">http://www.wolfsburg.de/~rauch</A>
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sane-umax: <A HREF="http://www.wolfsburg.de/~rauch/sane/sane-umax.html">http://www.wolfsburg.de/~rauch/sane/sane-umax.html</A>
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xsane: <A HREF="http://www.wolfsburg.de/~rauch/sane/sane-xsane.html">http://www.wolfsburg.de/~rauch/sane/sane-xsane.html</A>
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E-Mail: mailto:<A HREF="mailto:Oliver.Rauch@Wolfsburg.DE?Subject=Re:%20Simultaneous%20Net%20Calls&In-Reply-To=<39CDC748.D30DAA41@wolfsburg.de>">Oliver.Rauch@Wolfsburg.DE</A>
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<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:%20Simultaneous%20Net%20Calls&In-Reply-To=<39CDC748.D30DAA41@wolfsburg.de>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0239.html">Adrian Perez Jorge: "HP3400 & HP4300. Hacking report."</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0237.html">Timothy Little: "Re: will my scanner work"</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0227.html">Grega Bremec: "Simultaneous Net Calls"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Sun Sep 24 2000 - 02:06:45 PDT</EM>
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