[PATCH v2] eal/unix: allow creating thread with real-time priority

[Thomas Monjalon]

25/10/2023 17:37, Stephen Hemminger:
> On Wed, 25 Oct 2023 17:13:14 +0200
> Thomas Monjalon <thomas at monjalon.net> wrote:
> 
> >  	case RTE_THREAD_PRIORITY_REALTIME_CRITICAL:
> > +		/*
> > +		 * WARNING: Real-time busy loop takes priority on kernel threads,
> > +		 *          making the system unstable.
> > +		 *          There is also a known issue when using rte_ring.
> > +		 */
> 
> I was thinking something like:
> 
> 	static bool warned;
> 	if (!warned) {
> 		RTE_LOG(NOTICE, EAL, "Real time priority is unstable when thread is polling without sleep\n");
> 		warned = true;
> 	}

I'm not sure about bothering users.
They can fear something is wrong even if the developer took care of it.
I think doc warnings for developers are more appropriate.
I've added notes in the API.