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From: Attilio Rao <attilio@FreeBSD.org>
Date: Wed, 30 Sep 2009 13:26:31 +0000 (UTC)
To: cvs-src-old@freebsd.org
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Subject: cvs commit: src/sys/kern kern_rwlock.c kern_sx.c src/sys/sys
 rwlock.h sx.h
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attilio     2009-09-30 13:26:31 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             kern_rwlock.c kern_sx.c 
    sys/sys              rwlock.h sx.h 
  Log:
  SVN rev 197643 on 2009-09-30 13:26:31Z by attilio
  
  When releasing a read/shared lock we need to use a write memory barrier
  in order to avoid, on architectures which doesn't have strong ordered
  writes, CPU instructions reordering.
  
  Diagnosed by:   fabio
  Reviewed by:    jhb
  Tested by:      Giovanni Trematerra
                  <giovanni dot trematerra at gmail dot com>
  
  Revision  Changes    Path
  1.51      +4 -3      src/sys/kern/kern_rwlock.c
  1.71      +4 -4      src/sys/kern/kern_sx.c
  1.22      +0 -7      src/sys/sys/rwlock.h
  1.43      +1 -8      src/sys/sys/sx.h