for_the_science.rb

require "thwait"

class Job; end

module Processor
  def self.perform(worker_count, jobs)
    workers = worker_count.times.map do
      Thread.new do
        while job = jobs.pop
          yield job
        end
      end
    end
    ThWait.all_waits(workers)
  end
end

worker_count = 5
jobs = Array.new(10) { Job.new }

Processor.perform(worker_count, jobs) do |job|
  puts job.inspect
end