From owner-freebsd-questions Tue Nov 21 19:41:43 2000 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 B6A4037B4CF for ; Tue, 21 Nov 2000 19:41:40 -0800 (PST) Received: (from bright@localhost) by fw.wintelcom.net (8.10.0/8.10.0) id eAM3fc226281; Tue, 21 Nov 2000 19:41:38 -0800 (PST) Date: Tue, 21 Nov 2000 19:41:38 -0800 From: Alfred Perlstein To: Chris Hill Cc: bsdnewbie bsdnewbie , freebsd-questions@FreeBSD.ORG Subject: Re: _ DELAY(1) == delay 1 us ? 1 ms ? hz = ? Message-ID: <20001121194138.F18037@fw.wintelcom.net> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.2.5i In-Reply-To: ; from chris@monochrome.org on Tue, Nov 21, 2000 at 10:32:38PM -0500 Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG * Chris Hill [001121 19:32] wrote: > On Wed, 22 Nov 2000, bsdnewbie bsdnewbie wrote: > > > I see many DELAY() in some kernel source code, but I can not make clear how > > long does DELAY() delay. DELAY(1) = ? And what is hz, hz = ? > > bash-2.02$ man delay > No manual entry for delay > > Can't answer the first part, but I imagine that hz means Hertz, properly > abbreviated as Hz. 1 Hz is 1 cycle per second or one second per cycle. > Metric prefixes apply, therefore 1 kHz = 1000 cycles per second (0.001 > seconds or 1 ms per cycle), and so on. I just committed a manpage for DELAY(9). hz is usually 100. -- -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-questions" in the body of the message