RE: Backend: When to use reader process?

From: Davis, Tom (Tom.Davis@minolta-qms.com)
Date: Wed Feb 28 2001 - 08:46:25 PST

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    This is probably a good model for most scanners, since the task division
    appears to separate an I/O intensive task (acquiring the scan data) from a
    CPU intensive task (whatever processes the sane_read() data... often a
    compression task).

    Tom Davis

    -----Original Message-----
    From: Frederik Ramm [mailto:frederik@remote.org]
    Sent: Wednesday, February 28, 2001 10:23 AM
    To: sane-devel@mostang.com
    Subject: Backend: When to use reader process?

    Hi,

       I've noticed that the driver I am basing my M3091 work on, the
    M3096 driver which was in turn derived from the Coolscan driver, uses
    a separate process for reading data from the scanner, which is then
    fed via a pipe file descriptor to sane_read.

    Other drivers (like the Bell+Howell backend I've been looking at for
    duplex inspiration) don't use a separate process.

    Which would be the preferred way to implement it for a max. 15ppm ADF
    scanner?

    Bye
    Frederik 

    -- 
Frederik Ramm  ##  eMail frederik@remote.org  ##  N57°48.10' W005°40.32'

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