$pm->wait_all_child; should instead be $pm->wait_all_children.

The other larger problem is that the signal handler for child termination is gumming up the works. If you just comment out $SIG{CHLD} = \&REAP; the code works okay and run_on_finish() is properly called

In reply to Re: Parallel::ForkManager never reaching run_on_finish() by Loops
in thread Parallel::ForkManager never reaching run_on_finish() by swafo

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