interface filter blocking (run in serial, not concurrent)

[Greg Saunders]

Hello, I have some custom System V interface filters installed in some queues for job manipulation. It appears that filters on the same queue are run in serial, not concurrent. However, filters on different queues are run concurrently.

Is it possible to have a filter on one queue run concurrently for multiple users. For example, if the filter requires a lot of time for one print job but significantly less it would be nice that the long running process wouldn't block subsequent jobs.

Any help would be appreciated.

Thank you all in advance!
Greg