From owner-freebsd-threads@FreeBSD.ORG Fri Apr 4 14:09:56 2003 Return-Path: Delivered-To: freebsd-threads@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 24E3337B408 for ; Fri, 4 Apr 2003 14:09:56 -0800 (PST) Received: from sccrmhc03.attbi.com (sccrmhc03.attbi.com [204.127.202.63]) by mx1.FreeBSD.org (Postfix) with ESMTP id ED11C43FAF for ; Fri, 4 Apr 2003 14:09:52 -0800 (PST) (envelope-from julian@elischer.org) Received: from interjet.elischer.org (12-232-168-4.client.attbi.com[12.232.168.4]) by sccrmhc03.attbi.com (sccrmhc03) with ESMTP id <2003040422095100300p7svee>; Fri, 4 Apr 2003 22:09:52 +0000 Received: from localhost (localhost.elischer.org [127.0.0.1]) by InterJet.elischer.org (8.9.1a/8.9.1) with ESMTP id OAA37528; Fri, 4 Apr 2003 14:09:51 -0800 (PST) Date: Fri, 4 Apr 2003 14:09:49 -0800 (PST) From: Julian Elischer To: Peter Wemm In-Reply-To: <20030404200310.A374E2A8A9@canning.wemm.org> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: Daniel Eischen cc: freebsd-threads@freebsd.org Subject: Re: 1:N threading X-BeenThere: freebsd-threads@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Threading on FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 04 Apr 2003 22:09:56 -0000 On Fri, 4 Apr 2003, Peter Wemm wrote: > Daniel Eischen wrote: > > On Thu, 3 Apr 2003, Peter Wemm wrote: > > > > > Daniel Eischen wrote: > > > > > > > The patches are available: > > > > > > > > http://people.freebsd.org/~deischen/libpthread.diffs > > > > > > > > FYI, since this is a new mailing list, the above changes > > > > are meant to give libpthread M:N capability. > > > > > > > > I don't need testers; I have enough bugs that I know about > > > > to fix. > > > > > > + __asm__("movl %%gs, %0" : "=r" (id)); > > > + id >>= 3; > > > + if (id - NLDT < 0) > > > > > > There is a problem here, NLDT is kernel private and changes depending on > > > things like whether SMP is enabled or what the maximum number of cpus > > > is. > > > > > > You're trying to find if its a local or global selector, right? > > > What you really want is bit 2 which tells you which it is. > > > > > > #define ISLDT(s) ((s)&SEL_LDT) /* is it local or global */ > > > #define SEL_LDT 4 /* local descriptor table */ > > > > OK, but if NLDT is kernel private, how do can I know > > what LDTs I can use as local? > > Whoops. I misread NLDT as NGDT. > > Gah. We're doing some crufty stuff here. For starters, we're running > userland on a LDT for %cs and %ds/es/ss/etc. We really should be using a > GDT slot for those. Most of the other stuff there is for the a.out > "lcall 7,0" instruction and for BSDI's version of the lcall stuff. > > The i386_[gs]et_ldt() syscalls really should have a way of reporting what > is available for use. What we SHOULD be doing is setting an LDT entry to point to the mailbox (puts some constraints on the mailbox but..) of each upcall and setting %gs to teh appropriate entry before returning to userspace. (different schemes would be used for the other architectures.) > > Cheers, > -Peter > -- > Peter Wemm - peter@wemm.org; peter@FreeBSD.org; peter@yahoo-inc.com > "All of this is for nothing if we don't go to the stars" - JMS/B5 > > _______________________________________________ > freebsd-threads@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-threads > To unsubscribe, send any mail to "freebsd-threads-unsubscribe@freebsd.org" >