rte_lcore_has_role() return value

[Pavan Nikhilesh Bhagavatula]

Hi Morten, 

Looks like this is meant for Vipin.

+Vipin

Thanks,
Pavan.

> Pavan,
> 
> The rte_lcore_has_role() documentation says it returns bool.
> 
> Its implementation returns a true value (-1) if given a non-compliant lcore_id,
> e.g. LCORE_ID_ANY.
> 
> I think it should behave like rte_lcore_is_enabled(), i.e. return false if given a
> non-compliant lcore_id, e.g. LCORE_ID_ANY.
> 
> Use case:
> A control thread in an application might or might not register itself, and the
> registration might not succeed.
> 
> At exit of this control thread, it should unregister itself if registered.
> 
> Fixing rte_lcore_has_role() as suggested would simplify the application from
> this:
> 
> 	if (rte_lcore_id() != LCORE_ID_ANY &&
> 			rte_eal_lcore_role(rte_lcore_id()) == ROLE_NON_EAL)
> 		rte_thread_unregister();
> 
> To this:
> 
> 	if (rte_lcore_has_role(rte_lcore_id(), ROLE_NON_EAL))
> 		rte_thread_unregister();
> 
> -Morten