-- thread utils

function wait(t)
    coroutine.yield(t)
end

function thread(cb)
    local co = coroutine.create(cb)

    local function resumefun()
        if coroutine.status(co) == "dead" then
            return
        end

        local suc, time = coroutine.resume(co)

        if not suc then
            error(debug.traceback(co))
        end

        if suc and time then
            g_settimer(time, false, resumefun)
        end
    end

    resumefun()

    return co
end

function killthread(co)
    coroutine.close(co)
end