Update: eat lunch,
particle.
Abigail-II is right. it's trying to interpret the value of $counter as a variable name-- and it's a perl-special constant var. things like this are often not what you mean, and are caught by
use strict 'refs';
---
it's a syntax error, i assume you mean $counter and not $$counter. you're dereferencing the scalar, which is giving you it's memory location. you can't assign to that, because it's a constant. you'll have to fix lines 178 and 184 as well.
i must say, this code doesn't look right. i'd use Parallel::ForkManager for this application -- it's a well-oiled wheel.
~Particle *accelerates*
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