utils = {}

local sleep_tmr
local sleep_co

local function expire()
    local status, val = coroutine.resume(sleep_co, 0)
    if status == false then
        print("sleep occur error\n")
    end

end
function utils.init()
    sleep_tmr =tmr.create()
    sleep_co = coroutine.create(utils_daemon)
end

function utils.sleep(ms)
    --begin record time
    sleep_tmr:register(ms, tmr.ALARM_SINGLE, expire)
    sleep_tmr:start()
    --give up cpu
    coroutine.yield(ms)
end

return utils