From owner-freebsd-questions Tue Sep 30 18:26:53 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id SAA06800 for questions-outgoing; Tue, 30 Sep 1997 18:26:53 -0700 (PDT) Received: from mmlab.snu.ac.kr (mmlab.snu.ac.kr [147.46.114.112]) by hub.freebsd.org (8.8.7/8.8.7) with SMTP id SAA06795 for ; Tue, 30 Sep 1997 18:26:48 -0700 (PDT) Received: from mmlab.snu.ac.kr (opal.snu.ac.kr [147.46.114.116]) by mmlab.snu.ac.kr (8.6.12h2/8.6.12) with ESMTP id KAA07419 for ; Wed, 1 Oct 1997 10:26:59 +1000 Message-ID: <3431A605.35AEBDE1@mmlab.snu.ac.kr> Date: Wed, 01 Oct 1997 10:23:17 +0900 From: Changho Choi X-Mailer: Mozilla 4.03 [en] (Win95; I) MIME-Version: 1.0 To: freebsd-questions@FreeBSD.ORG Subject: kernel programming in 4.3BSD Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: owner-freebsd-questions@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk hello there! I have some questions, if you know about those, reply for me please. (I use 4.3BSD....) 1. I want to know how long one processor occupies CPU before happening context switching. In other words, how often does context switching happen. how can I change that time?(context switching interval) 2. Is there any way to use math fuctions(for example, log(), sqrt() functions...) in kernel? 3. Do you know how can I delay the message which pass by the kernel? I wanna delay the message for some time in kernel. thanks in advance for your reply.. have a good luck!...^.^; --------------------------------------------------- Changho choi (Seoul National University in korea.) e-mail : chchoi@mmlab.snu.ac.kr Web : http://mmlab.snu.ac.kr/~chchoi