From owner-freebsd-hackers Mon Nov 27 16:39:56 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from fw.wintelcom.net (ns1.wintelcom.net [209.1.153.20]) by hub.freebsd.org (Postfix) with ESMTP id F3F1337B479 for ; Mon, 27 Nov 2000 16:39:54 -0800 (PST) Received: (from bright@localhost) by fw.wintelcom.net (8.10.0/8.10.0) id eAS0dmN19733; Mon, 27 Nov 2000 16:39:48 -0800 (PST) Date: Mon, 27 Nov 2000 16:39:48 -0800 From: Alfred Perlstein To: FengYue Cc: David Petrou , freebsd-hackers@FreeBSD.ORG Subject: Re: thread model questions Message-ID: <20001127163948.S8051@fw.wintelcom.net> References: <20001127150916.R8051@fw.wintelcom.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: ; from fengyue@bluerose.windmoon.nu on Mon, Nov 27, 2000 at 04:10:49PM -0800 Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG * FengYue [001127 16:08] wrote: > > On Mon, 27 Nov 2000, Alfred Perlstein wrote: > > ->* David Petrou [001127 14:41] wrote: > ->> thanks for the quick reply... > ->> > ->> > > 3. if preemptive, does that occur at user-level, or by the kernel? > ->> > > (and how costly is it?) > ->> > > ->> > It's a mix, and very cheap. > > I thought it's preemptive purely at user-level since the threads are > scheduled by thread lib at user-level only. No? What are you asking? Give a scenario and I'll explain what should happen. -- -Alfred Perlstein - [bright@wintelcom.net|alfred@freebsd.org] "I have the heart of a child; I keep it in a jar on my desk." To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message