hi all. i write a real-time task by using Native API such as :rt_task_create(), rt_task_start(rttask_demo,..)... void rttask_demo(void *arg) { .../* posix API*/ } In rttask_demo body code i use standard POSIX API such as : socket(), send(), recev() to connect to Network base on original Network driver. in this case, does my rttask_demo execute as hard-realtime ? I'm a newbabie in Xenomai thanks for any advise. Luan Dinh