From owner-cvs-src@FreeBSD.ORG  Wed Apr 19 21:06:52 2006
Return-Path: <owner-cvs-src@FreeBSD.ORG>
X-Original-To: cvs-src@FreeBSD.org
Delivered-To: cvs-src@FreeBSD.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id BE79E16A407;
	Wed, 19 Apr 2006 21:06:52 +0000 (UTC) (envelope-from jhb@FreeBSD.org)
Received: from repoman.freebsd.org (repoman.freebsd.org [216.136.204.115])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 7B7D043D48;
	Wed, 19 Apr 2006 21:06:52 +0000 (GMT) (envelope-from jhb@FreeBSD.org)
Received: from repoman.freebsd.org (localhost [127.0.0.1])
	by repoman.freebsd.org (8.13.1/8.13.1) with ESMTP id k3JL6qmE043988;
	Wed, 19 Apr 2006 21:06:52 GMT (envelope-from jhb@repoman.freebsd.org)
Received: (from jhb@localhost)
	by repoman.freebsd.org (8.13.1/8.13.1/Submit) id k3JL6qLq043987;
	Wed, 19 Apr 2006 21:06:52 GMT (envelope-from jhb)
Message-Id: <200604192106.k3JL6qLq043987@repoman.freebsd.org>
From: John Baldwin <jhb@FreeBSD.org>
Date: Wed, 19 Apr 2006 21:06:52 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org
X-FreeBSD-CVS-Branch: HEAD
Cc: 
Subject: cvs commit: src/sys/kern kern_rwlock.c src/sys/sys rwlock.h
X-BeenThere: cvs-src@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: CVS commit messages for the src tree <cvs-src.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-src>
List-Post: <mailto:cvs-src@freebsd.org>
List-Help: <mailto:cvs-src-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src>,
	<mailto:cvs-src-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 19 Apr 2006 21:06:52 -0000

jhb         2006-04-19 21:06:52 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             kern_rwlock.c 
    sys/sys              rwlock.h 
  Log:
  Implement rw_try_upgrade() and rw_downgrade().  rw_try_upgrade() makes a
  single attempt at upgrading a read lock to a write lock, and rw_downgrade()
  converts curthread's write lock into a read lock.
  
  Revision  Changes    Path
  1.9       +133 -2    src/sys/kern/kern_rwlock.c
  1.3       +5 -1      src/sys/sys/rwlock.h