[cups.bugs] Cups scheduler do not start backend for each file for jobs with printmultiple files

[Michael Sweet]

On Jul 27, 2010, at 6:28 AM, Mario Goppold wrote:
> Hi,
> 
> for jobs with more than one file the filter chain is called for each file but there ist only one call for the backend of the whole job.
> 
> Is this supposed to be like this?

Yes, otherwise multiple-file jobs (and this includes jobs with banner pages) can end up with intervening jobs on the printer.

Consider:

    Client A -> Printer
    Client B -> Printer

If Client A and Client B both have jobs pending for the same printer, each client needs to hold a connection to the printer for the entire job, otherwise the other client's jobs can get mixed in...

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Michael Sweet, Senior Printing System Engineer, PWG Chair