From owner-freebsd-current Thu Sep 19 15:25:54 2002 Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.FreeBSD.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id F174837B401 for ; Thu, 19 Sep 2002 15:25:52 -0700 (PDT) Received: from mail.pcnet.com (pcnet1.pcnet.com [204.213.232.3]) by mx1.FreeBSD.org (Postfix) with ESMTP id 79C8543E6A for ; Thu, 19 Sep 2002 15:25:52 -0700 (PDT) (envelope-from eischen@pcnet1.pcnet.com) Received: from localhost (eischen@localhost) by mail.pcnet.com (8.12.3/8.12.1) with ESMTP id g8JMPbOT027644; Thu, 19 Sep 2002 18:25:37 -0400 (EDT) Date: Thu, 19 Sep 2002 18:25:37 -0400 (EDT) From: Daniel Eischen To: Terry Lambert Cc: Bruce Evans , Julian Elischer , Edwin Culp , current@FreeBSD.ORG Subject: Re: slapd dumping core with today's current. In-Reply-To: <3D8A4CB2.914E7A9C@mindspring.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG 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 majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message