Re: thread-ready ABIs

["Kevin D. Kissell" <kevink@mips.com>]

> > Well, why not use the stack?
> >
> > I am not quite familiar with the requirements on this "thread register",
> > but couldn't something like this be made to work:
> >   #define TID *((sp & ~(STACK_SIZE-1)) + STACK_SIZE - TID_OFFSET)
> >
> > It assumes a fixed maximum stack size (and alignment), which it should
> > be possible to meet (virtual memory is cheap). The STACK_SIZE could
> > probably even be a (process global!) variable if it is not desirable
> > to limit this at compile time.
>
> Thanks for writing this up.  I had the same thought over dinner,
> but I'm throughly discredited today, and it's better that it came
> from someone else.   ;-)

That having been said, I don't think this scheme
will really work. Programs do build themselves
temporary stacks in the heap from time to time.
Signal stacks come to mind.

            Regards,

            Kevin K.