Well, if to rediscover the wheel:
write the 5th perl process for managing file names
and let that process
to give those names away to the processes of yours at request?
I'm not sure.
They can talk with each other via simple socket.
Maybe some database table will do the trick?
Sorry if these suggestions offended anyone.

In reply to Re: Synchronizing multiple processes retrieving files out of shared directory by Lennotoecom
in thread Synchronizing multiple processes retrieving files out of shared directory by MitchInOmaha

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