授業も始まったし、早速

sleep_sort.rb

ary = [8,2,3,7,1,2,5,7,8,3,5,6]
result = []
threads = []
ary.each{|e|
	threads.push Thread.new{
		sleep e
		result.push e
	}
}
loop do
  if not threads.map{|e| e.alive? }.include?(true)
    puts result.to_s
    exit 0
  end
  sleep 1
end