Grega Bremec wrote:
> Hi all,
> I must apologize in advance if this is a redundant question, but I was
> wondering to what extent is the net backend's behaviour defined for
> multiple "simultaneous" incoming requests to a single device?
> Does saned do any kind of resource locking, or is this entirely up to
> individual backends?
> I did take a look at the network spec, but it doesn't seem to be
> covered in there, however I did not look at the source.
I did not test this but as far as I see there is started a separate
saned (strange, on my system it looks like two saned's are started)
for each net connection.
This means that there sould be no difference between a
net connection and a local connection to the backend.
The backends have to make sure that the device is reserved
when a scan is started. For scsi scanners this is normally
done by a "RESERVE_UNIT" call that makes sure that only
the process that called "RESERVE_UNIT" can talk to the scanner,
other processes get a DEVICE-BUSY or RESERVATION-CONFLICT-error.
-- Homepage: http://www.wolfsburg.de/~rauch sane-umax: http://www.wolfsburg.de/~rauch/sane/sane-umax.html xsane: http://www.wolfsburg.de/~rauch/sane/sane-xsane.html E-Mail: mailto:Oliver.Rauch@Wolfsburg.DE
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