From owner-cvs-all Wed Dec 13 13:45:56 2000 From owner-cvs-all@FreeBSD.ORG Wed Dec 13 13:45:50 2000 Return-Path: Delivered-To: cvs-all@freebsd.org Received: from mail.interware.hu (mail.interware.hu [195.70.32.130]) by hub.freebsd.org (Postfix) with ESMTP id B2B7737B699; Wed, 13 Dec 2000 13:45:48 -0800 (PST) Received: from monrovia-11.budapest.interware.hu ([195.70.53.203] helo=elischer.org) by mail.interware.hu with esmtp (Exim 3.16 #1 (Debian)) id 146Jic-0000nj-00; Wed, 13 Dec 2000 22:45:47 +0100 Sender: julian@FreeBSD.ORG Message-ID: <3A37EDE7.4E2A2F52@elischer.org> Date: Wed, 13 Dec 2000 13:45:11 -0800 From: Julian Elischer X-Mailer: Mozilla 4.7 [en] (X11; U; FreeBSD 5.0-CURRENT i386) X-Accept-Language: en, hu MIME-Version: 1.0 To: John Baldwin Cc: Bosko Milekic , cvs-all@FreeBSD.org, cvs-committers@FreeBSD.org Subject: Re: cvs commit: src/sys/sys mbuf.h References: Content-Type: text/plain; charset=iso-8859-15 Content-Transfer-Encoding: 7bit Sender: owner-cvs-all@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG John Baldwin wrote: > > On 13-Dec-00 Bosko Milekic wrote: > > bmilekic 2000/12/12 21:13:03 PST > > > > Modified files: > > sys/sys mbuf.h > > Log: > > Eliminate a race in MEXTFREE(). The reference counter decrement and test > > was not atomic. We now make sure that we free the ext buf if the reference > > count is about to reach 0 but also make sure that nobody else has done it > > before us. > > > > While I'm here, change refcnt to u_int (from long). This fixes a compiler > > warning regarding use of atomic_cmpset_long on i386. > > If you are using atomic_cmpset_long, then use u_long for the refcount instead > of u_int please. Eitehr that, or use atomic_cmpset_int. looking at the alpha code it looks like possibly cmpset instructions have to be synthesised on alpha and might be quite expensive.. what are the facts in this regard? > > -- > > John Baldwin -- http://www.FreeBSD.org/~jhb/ > PGP Key: http://www.Baldwin.cx/~john/pgpkey.asc > "Power Users Use the Power to Serve!" - http://www.FreeBSD.org/ -- __--_|\ Julian Elischer / \ julian@elischer.org ( OZ ) World tour 2000 ---> X_.---._/ presently in: Budapest v To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe cvs-all" in the body of the message