On Thu, 19 Sep 2002, Terry Lambert wrote: > Bruce Evans wrote: > > Unfortunately, we didn't get expansion of the i386 mcontext_t to make > > room for SSE, into 4.0, and the problem has been mostly ignored since > > then. Looks like it is a large problem. > > Any chance of avoiding this in the future by adding an "extensible, > but known to be suboptimal if used" extension field, so that these > kind of changes can be made without having to change anything > important to the point of incompatability? > > That type of thing would let the problem be fixed in an ugly way, > but at least it would be fixed, without balancing things on a > knife's edge of incompatability vs. non-working code.
That's kind of the point of adding the fields that we did (mc_len, mc_fpformat). They can be used to help validate the contents and to allow extensions. We also have some spare slots, but the last incarnation of ucontext_t also had spare slots and it wasn't nearly enough for what we now need. -- Dan Eischen To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
