I haven't felt the need for using a module for handling fork, but glancing at Parallel::ForkManager I see that the methods are called things like run_on_finish, but you are omitting the "run_" part of the name in your code sample. Could that be your problem?

If you want an explanation of forking, you could do worse than this article. Don't let the cartoons put you off, there is quite a bit of technical content there.

In reply to Re (tilly) 1: Fork() confusion by tilly
in thread Fork() confusion by dkode

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