M68k C++ Exceptions working!
valette at crf.canon.fr
Mon Jan 17 08:38:12 UTC 2000
Ian Lance Taylor wrote:
> Date: Fri, 14 Jan 2000 14:33:30 +0100
> From: Eric Valette <valette at crf.canon.fr>
> Sorry to jump in but I may add the following (especially regarding the
> recent discussion on the interrupt void* argument to hanlder). A single
> per thread data software register is usually usefull for multi-thread
> On the i386 I think that would be prohibitively expensive. There are
> so few registers as it is.
> It's true that many RISC architectures could easily support such a
> register. In fact, some assign such a register in the conventional
This is not what I was thinking : unless it is specified in the ABI, you
must use a "software" register not
a hardware one.
> rtems_task_get_note(RTEMS_SELF, i, &v) is pretty efficient. It's a
> single function call that has no loops and calls no other functions.
> (On the other hand, I'm not sure it's interrupt safe.)
I think it should be mapped directly in a global variable
like void* currentThreadCtx (especially if one day memory protection
/ ` Eric Valette
/-- __ o _. Canon CRF - Communication Dept
(___, / (_(_(__ Rue de la touche lambert
35517 Cesson-Sevigne Cedex
Tel: +33 (0)2 99 87 68 91 Fax: +33 (0)2 99 84 11 30
E-mail: valette at crf.canon.fr http://www.crf.canon.fr
More information about the users