From owner-freebsd-questions Sun Nov 14 16:53:15 1999 Delivered-To: freebsd-questions@freebsd.org Received: from fw.wintelcom.net (ns1.wintelcom.net [209.1.153.20]) by hub.freebsd.org (Postfix) with ESMTP id 3B10E15136; Sun, 14 Nov 1999 16:53:12 -0800 (PST) (envelope-from bright@wintelcom.net) Received: from localhost (bright@localhost) by fw.wintelcom.net (8.9.3/8.9.3) with ESMTP id RAA27991; Sun, 14 Nov 1999 17:17:32 -0800 (PST) Date: Sun, 14 Nov 1999 17:17:32 -0800 (PST) From: Alfred Perlstein To: Jonathon McKitrick Cc: Kris Kennaway , freebsd-questions@FreeBSD.ORG Subject: Re: threads.... In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG On Sun, 14 Nov 1999, Jonathon McKitrick wrote: > On Sun, 14 Nov 1999, Kris Kennaway wrote: > > >On Sun, 14 Nov 1999, Jonathon McKitrick wrote: > > > >> I've seen 'FUD' a lot, and I know it's not good... what does it mean > >> again? > > > >Read the jargon file. > > > >> Also, from what I understand, the issue with threads is in the kernel, > >> not user space. If I understand correctly, the kernel is not threaded, > >> which means that all processes must wait one at a time for each kernel > >> call to finish, since it cannot be pre-empted. It this correct? I saw > >> an earlier post saying that Linux has a jump on this. > > > >This is an unrelated issue (Linux isn't very much beyond FreeBSD here). > > > >> I understand that user threads are supported, but apparently the issue > >> is kernel threads. > > > >You still haven't explained how. > OK, then, let me ask this: > Just what _is_ the thread support Linux has that FreeBSD doesn't have at > the moment? I will procede once I have an accurate answer to this > question. Apparently FreeBSD still multitasks quite well without this > feature, but that doesn't mean it shouldn't be a future design goal. FreeBSD supports the linux clone() syscall, there is outdated work available on http://lt.tar.com/ for a FreeBSD port of linuxthreads. What linux uses as it's thread model is a shared address space fork with wrappers for signals and other thread specific. This has been discussed to death already, I invite you to take a search on the mailing lists for a the thread that discusses the work on http://lt.tar.com/ -Alfred To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message