按照书上码了下，但运行有问题，暂时不知道原因：

function send (x)	coroutine.yield(x)endfunction producer()  return coroutine.create( function ()	 while true do	  local x = 1	  send(x)	  end	end)endfunction receive(prod)	local status, value = coroutine.resume(prod)	return valueendfunction filter (prod)	return coroutine.create(function()		a = {1,2,3,4,5,6,7,8,9,10}		for line , k in pairs(a) do		local x = receive(prod)		x = string.format("%5d %s",line,x)		send(x)		end	end)endfunction consumer (prod)	while true do		local x = receive(prod)		print(x)	endendconsumer(filter(producer()))

　　之后再来细看，主要是 producter-consumer模型。