From owner-cvs-src-old@FreeBSD.ORG  Wed Apr 20 14:19:43 2011
Return-Path: <owner-cvs-src-old@FreeBSD.ORG>
Delivered-To: cvs-src-old@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 6A9811065769
	for <cvs-src-old@freebsd.org>; Wed, 20 Apr 2011 14:19:41 +0000 (UTC)
	(envelope-from rstone@FreeBSD.org)
Received: from repoman.freebsd.org (repoman.freebsd.org
	[IPv6:2001:4f8:fff6::29])
	by mx1.freebsd.org (Postfix) with ESMTP id 58ECC8FC17
	for <cvs-src-old@freebsd.org>; Wed, 20 Apr 2011 14:19:41 +0000 (UTC)
Received: from repoman.freebsd.org (localhost [127.0.0.1])
	by repoman.freebsd.org (8.14.4/8.14.4) with ESMTP id p3KEJfaQ016009
	for <cvs-src-old@freebsd.org>; Wed, 20 Apr 2011 14:19:41 GMT
	(envelope-from rstone@repoman.freebsd.org)
Received: (from svn2cvs@localhost)
	by repoman.freebsd.org (8.14.4/8.14.4/Submit) id p3KEJfOk016008
	for cvs-src-old@freebsd.org; Wed, 20 Apr 2011 14:19:41 GMT
	(envelope-from rstone@repoman.freebsd.org)
Message-Id: <201104201419.p3KEJfOk016008@repoman.freebsd.org>
X-Authentication-Warning: repoman.freebsd.org: svn2cvs set sender to
	rstone@repoman.freebsd.org using -f
From: Ryan Stone <rstone@FreeBSD.org>
Date: Wed, 20 Apr 2011 14:19:34 +0000 (UTC)
To: cvs-src-old@freebsd.org
X-FreeBSD-CVS-Branch: HEAD
Subject: cvs commit: src/lib/libthr/thread thr_once.c
X-BeenThere: cvs-src-old@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: **OBSOLETE** CVS commit messages for the src tree
	<cvs-src-old.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src-old>,
	<mailto:cvs-src-old-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/cvs-src-old>
List-Post: <mailto:cvs-src-old@freebsd.org>
List-Help: <mailto:cvs-src-old-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/cvs-src-old>,
	<mailto:cvs-src-old-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 20 Apr 2011 14:19:43 -0000

rstone      2011-04-20 14:19:34 UTC

  FreeBSD src repository

  Modified files:
    lib/libthr/thread    thr_once.c 
  Log:
  SVN rev 220888 on 2011-04-20 14:19:34Z by rstone
  
  r179417 introduced a bug into pthread_once().  Previously pthread_once()
  used a global pthread_mutex_t for synchronization.  r179417 replaced that
  with an implementation that directly used atomic instructions and thr_*
  syscalls to synchronize callers to pthread_once.  However, calling
  pthread_mutex_lock on the global mutex implicitly ensured that
  _thr_check_init() had been called but with r179417 this was no longer
  guaranteed.  This meant that if you were unlucky enough to have your first
  call into libthr be a call to pthread_once(), you would segfault when
  trying to access the pointer returned by _get_curthread().
  
  The fix is to explicitly call _thr_check_init() from pthread_once().
  
  Reviewed by:    davidxu
  Approved by:    emaste (mentor)
  MFC after:      1 week
  
  Revision  Changes    Path
  1.8       +2 -0      src/lib/libthr/thread/thr_once.c