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Thread critical = true

x = 0 t1 = Thread.new do   1.upto(1000) do     Thread.critical = true     x = x + 1     Thread.critical = false   end end t2 = Thread.new do   1.upto(1000) do     Thread.critical = true     x = x + 1     Thread.critical = false   end end t1.join t2.join puts x