From owner-cvs-all  Thu Mar 11 19: 9:54 1999
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From: Julian Elischer <julian@FreeBSD.org>
Date: Thu, 11 Mar 1999 19:09:29 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/kern kern_lock.c kern_subr.c
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julian      1999/03/11 19:09:29 PST

  Modified files:
    sys/kern             kern_lock.c kern_subr.c 
  Log:
  This solves a deadlock that can occur when read()ing into a file-mmap()
  space. When doing this, it is possible to for another process to attempt
  to get an exclusive lock on the vnode and deadlock the mmap/read
  combination when the uiomove() call tries to obtain a second
  shared lock on the vnode. There is still a potential deadlock
  situation with write()/mmap().
  Submitted by: Matt Dillon <dillon@freebsd.org>
  Reviewed by: Luoqi Chen <luoqi@freebsd.org>
  Delimmitted by tag PRE_MATT_MMAP_LOCK and POST_MATT_MMAP_LOCK
  in kern/kern_lock.c kern/kern_subr.c
  
  Revision  Changes    Path
  1.24      +24 -3     src/sys/kern/kern_lock.c
  1.28      +12 -4     src/sys/kern/kern_subr.c


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