You don't want to parallelize your main tasks so, don't fork on your main loop and ensure that no children are running at the end of every iteration: 
use Proc::Queue size => 5;

for (1..20) {
  # you don't want to fork here!!!
  do_task($_);
  1 while wait != -1;
}

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In reply to Re: Proc::Queue problem by salva
in thread Proc::Queue problem by Amphiaraus

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