From owner-cvs-src@FreeBSD.ORG  Mon Mar 21 23:01:30 2005
Return-Path: <owner-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 B9E3616A4CE; Mon, 21 Mar 2005 23:01:30 +0000 (GMT)
Received: from repoman.freebsd.org (repoman.freebsd.org [216.136.204.115])
	by mx1.FreeBSD.org (Postfix) with ESMTP
	id 9419F43D3F; Mon, 21 Mar 2005 23:01:30 +0000 (GMT)
	(envelope-from iedowse@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 j2LN1Umw084501;
	Mon, 21 Mar 2005 23:01:30 GMT
	(envelope-from iedowse@repoman.freebsd.org)
Received: (from iedowse@localhost)
	by repoman.freebsd.org (8.13.1/8.13.1/Submit) id j2LN1Uqk084500;
	Mon, 21 Mar 2005 23:01:30 GMT
	(envelope-from iedowse)
Message-Id: <200503212301.j2LN1Uqk084500@repoman.freebsd.org>
From: Ian Dowse <iedowse@FreeBSD.org>
Date: Mon, 21 Mar 2005 23:01:30 +0000 (UTC)
To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org,
	cvs-all@FreeBSD.org
X-FreeBSD-CVS-Branch: RELENG_5
Subject: cvs commit: src/share/man/man9 Makefile timeout.9 src/sys/kern
 kern_timeout.c
X-BeenThere: cvs-src@freebsd.org
X-Mailman-Version: 2.1.1
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: Mon, 21 Mar 2005 23:01:30 -0000

iedowse     2005-03-21 23:01:30 UTC

  FreeBSD src repository

  Modified files:        (Branch: RELENG_5)
    share/man/man9       timeout.9 Makefile 
    sys/kern             kern_timeout.c 
  Log:
  Partialially MFC the changes to the callout system that prevent
  race conditions when stopping and resetting timers. This only avoids
  the race conditions with Giant-locked callouts; it was not possible
  to backport callout_init_mtx() since adding the c_mtx field to
  struct callout would have changed the callout ABI.
  
  Giant-locked callouts will now have much simpler semantics. As long
  as Giant is held when invoking callout_stop() or callout_reset(),
  then these functions will guarantee that the callout will be stopped,
  even if softclock() had already begun to process the callout.
  
  There should be no change in behaviour for "MP-safe" callouts; these
  still need to use the techniques now described in timeout(9) to
  avoid race conditions.
  
  Approved by:    re (kensmith)
  
  Revision   Changes    Path
  1.239.2.8  +3 -0      src/share/man/man9/Makefile
  1.23.2.2   +252 -9    src/share/man/man9/timeout.9
  1.91.2.2   +52 -8     src/sys/kern/kern_timeout.c