game = {updates = {}}

function game:update ()
    local updated = false
    for i, v in pairs(self.updates) do
        updated = true
        if not coroutine.resume(v) then
            self.updates[i] = nil
        end
    end
    return updated
end

function game:run ()
    while self:update() do end
end

game.updates.example =
coroutine.create(
    function ()
        for i = 1, 10 do
            print(i)
            coroutine.yield()
        end
    end
)

game:run()
--[[
10
9
8
7
6
5
4
3
2
1
]]