Chief number in TID's

[Marcus Voelp]

> 
> 	Does anyone have a 'good' reason for the chief number to be an a
> TID for the use of users (nothing to do with kernel internals and
> implimentation). Removing the chief from the TID allows 32bit TID's with a
> 'reasonable' number of tasks and threads per task. :)
> 
> 	Cheers Adam
> 
I'm not yet confirm with the implementation code, but it might have two reasons

1) Theoretically each thread could be chief of each other, so you need full TID
   In practise I don't think this is a problem because you don't have that much
   chiefs at all

2) Performance: if the chief number is a TID it is easy to replace the aim of
   IPCs by that number. If so you may use a fixed offset to reduce the size, 
   let's say chiefs have TIDs FA - FF using FA as offset

Ciao Marcus