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From: John Baldwin <jhb@FreeBSD.org>
Date: Fri, 4 May 2001 10:15:17 -0700 (PDT)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/kern kern_mutex.c kern_sx.c subr_witness.c
         src/sys/sys _lock.h lock.h mutex.h
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jhb         2001/05/04 10:15:17 PDT

  Modified files:
    sys/kern             kern_mutex.c kern_sx.c subr_witness.c 
    sys/sys              _lock.h lock.h mutex.h 
  Log:
  - Move state about lock objects out of struct lock_object and into a new
    struct lock_instance that is stored in the per-process and per-CPU lock
    lists.  Previously, the lock lists just kept a pointer to each lock held.
    That pointer is now replaced by a lock instance which contains a pointer
    to the lock object, the file and line of the last acquisition of a lock,
    and various flags about a lock including its recursion count.
  - If we sleep while holding a sleepable lock, then mark that lock instance
    as having slept and ignore any lock order violations that occur while
    acquiring Giant when we wake up with slept locks.  This is ok because of
    Giant's special nature.
  - Allow witness to differentiate between shared and exclusive locks and
    unlocks of a lock.  Witness will now detect the case when a lock is
    acquired first in one mode and then in another.  Mutexes are always
    locked and unlocked exclusively.  Witness will also now detect the case
    where a process attempts to unlock a shared lock while holding an
    exclusive lock and vice versa.
  - Fix a bug in the lock list implementation where we used the wrong
    constant to detect the case where a lock list entry was full.
  
  Revision  Changes    Path
  1.63      +5 -40     src/sys/kern/kern_mutex.c
  1.5       +4 -28     src/sys/kern/kern_sx.c
  1.70      +191 -90   src/sys/kern/subr_witness.c
  1.2       +1 -3      src/sys/sys/_lock.h
  1.31      +21 -5     src/sys/sys/lock.h
  1.31      +11 -23    src/sys/sys/mutex.h


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