$slow = 0 $fast = 0 (Thread.new { loop { $slow += 1 } }).priority = -2 (Thread.new { loop { $fast += 1 } }).priority = -1 sleep 1 Thread.critical = true puts "The slow thread counted to #{$slow}" puts "The fast thread counted to #{$fast}" # The slow thread counted to 11675 # The fast thread counted to 629474