lua coroutine filter

function send (x)
	coroutine.yield(x)
end

function producer ()
	return coroutine.create (function ()
		while true do
			local x = io.read()
			send(x)
		end
	end)
end

function receive (prod)
	local status, value = coroutine.resume(prod)
	return value
end

function filter (prod)
	return coroutine.create(function ()
		for line = 1, math.huge do
			local x = receive(prod)
			x = string.format("%5d %s", line, x)
			send(x)
		end
	end)
end

function consumer (prod)
	while true do
		local x = receive(prod)
		io.write(x, "\n")
	end
end

p = producer()
f = filter(p)
consumer(f)

lua coroutine filter

原文：http://blog.csdn.net/kevin_samuel/article/details/19138553