# Re: What's the status of sanei-thread?

From: Oliver Rauch (oliver.rauch@rauch-domain.de)
Date: Fri Jul 06 2001 - 09:36:34 PDT

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  Mick Barry wrote:
  >
  > Oliver Rauch wrote:
  >
  > >> What was the original idea behind implementing the second process in
  > >> some of the backends?
  > >
  > >
  > > The idea is to make the data flow between scanner and backend
  > > independant from the data flow between backend and frontend.
  > >
  > > But this also can be done by intelligent scsi command handling
  > > and may be also by good usb command handling.
  > >
  > > Bye
  > > Oliver
  >
  > What about implementing an (optional) wrapper around the backend to make
  > the flow between the f/e and the b/e independant of the flow between
  > scanner and b/e.

  No. That is bad. sane_read of all backends have to be independant
  of the backend <-> scanner data flow.

  May be we should write some sanei_* routines that can be used by
  all backends. As long as the data is transfered via the generic
  scsi functions it should always be possible to initiate a read
  command without having to wait until it is finished. May be
  already this does make sane_read independant (enough) from the
  scanner<->backend data flow. If command queueing is available
  I think we will get better results than with the reader_processes.

  Bye
  Oliver

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