From owner-cvs-all  Mon Mar  5 22:17:10 2001
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From: Bosko Milekic <bmilekic@FreeBSD.org>
Date: Mon, 5 Mar 2001 22:17:06 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/kern kern_sx.c src/sys/sys sx.h
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bmilekic    2001/03/05 22:17:06 PST

  Modified files:
    sys/kern             kern_sx.c 
    sys/sys              sx.h 
  Log:
  - Add sx_descr description member to sx lock structure
  - Add sx_xholder member to sx struct which is used for INVARIANTS-enabled
    assertions. It indicates the thread that presently owns the xlock.
  - Add some assertions to the sx lock code that will detect the fatal
    API abuse:
       xlock --> xlock
       xlock --> slock
    which now works thanks to sx_xholder.
    Notice that the remaining two problematic cases:
       slock --> xlock
       slock --> slock (a little less problematic, but still recursion)
    will need to be handled by witness eventually, as they are more
    involved.
  
  Reviewed by: jhb, jake, jasone
  
  Revision  Changes    Path
  1.2       +27 -7     src/sys/kern/kern_sx.c
  1.2       +12 -8     src/sys/sys/sx.h


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