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require 'thread'
# many producers, one consumer
n = 1_000_000
m = 10
q = Thread::SizedQueue.new(100)
consumer = Thread.new do
while q.pop
# consuming
end
end
producers = m.times.map do
Thread.new do
while n > 0
q.push true
n -= 1
end
end
end
producers.each(&:join)
q.push nil
consumer.join
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