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From: Ed Schouten <ed@FreeBSD.org>
Date: Tue, 3 Nov 2009 21:06:19 +0000 (UTC)
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Subject: cvs commit: src/sys/kern subr_log.c subr_prf.c src/sys/sys msgbuf.h
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ed          2009-11-03 21:06:19 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             subr_log.c subr_prf.c 
    sys/sys              msgbuf.h 
  Log:
  SVN rev 198860 on 2009-11-03 21:06:19Z by ed
  
  Make /dev/klog and kern.msgbuf* MPSAFE.
  
  Normally msgbufp is locked using Giant. Switch it to use the
  msgbuf_lock. Instead of changing the tsleep() calls to msleep(), just
  convert it to condvar(9).
  
  In my opinion the locking around msgbuf_peekbytes() still remains
  questionable. It looks like locks are dropped while performing copies of
  multiple blocks to userspace, which may cause the msgbuf to be reset in
  the mean time. At least getting it underneath from Giant should make it
  a little easier for us to figure out how to solve that.
  
  Reminded by:    rdivacky
  
  Revision  Changes    Path
  1.66      +41 -32    src/sys/kern/subr_log.c
  1.139     +16 -5     src/sys/kern/subr_prf.c
  1.29      +1 -0      src/sys/sys/msgbuf.h