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$ cat experiments/prodcons.rb require 'thread' queue = Queue.new producer = Thread.new do 5.times do |i| sleep rand(i) # simulate expense queue << i puts "#{i} produced #{queue.num_waiting}" end end consumer = Thread.new do 5.times do |i| value = queue.pop sleep rand(i/2) # simulate expense puts "consumed #{value} #{queue.num_waiting}" end end consumer.join

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