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require “monitor”
extend MonitorMixin
def x(n)
synchronize do
x(n-1) unless n.zero?
end
end
t1 = Thread.start do
i = 0
loop do
x(i)
i += 1
end
end
t2 = Thread.start do
loop do
synchronize do
sleep 1
p Time.now
end
end
end
loop { t1.wakeup }
sleep