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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