Realtime thread priorities

[David Xu]

> You still don't answer me about how to avoid a time-sharing thread
> holding a critical kernel resource which preempted by a user RT thread,
> and later the RT thread requires the resource, but the time-sharing
> thread has no chance to run because another RT thread is dominating
> the CPU because it is doing CPU bound work, result is deadlock, even if
> you know you trust your RT process, there are many code which were

not

> written by you, 
> 
>