[Xenomai] wait for data from RTDM device

[Шевченко Тарас Григорьевич]

Good day! 
In my project I want to send data by use ioctl_rt function 
than wait 1 ms and return data from device if present or error if time expired 
which function prefere to use ? 
I found rtdm_task_busy_wait but no examples to use it, so Im not shure 
please give me an advice 
Thank you 

С уважением и надеждой на сотрудничество, 
Шевченко Т.Г.