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Date:      Mon, 25 Jun 2001 16:17:53 -0700 (PDT)
From:      John Baldwin <jhb@FreeBSD.org>
To:        cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject:   cvs commit: src/sys/kern subr_witness.c
Message-ID:  <200106252317.f5PNHrb66265@freefall.freebsd.org>

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jhb         2001/06/25 16:17:53 PDT

  Modified files:
    sys/kern             subr_witness.c 
  Log:
  - Move the 'clk' spinlock below other spin locks since KTR trace events
    may need the clock lock for nanotime().
  - Add KTR trace events for lock list manipulations and other witness
    operations.
  - Use a temporary variable instead of setting the lock list head directly
    and then setting up the links to add a new lock list entry to the lock
    list.  This small race could result in witness "forgetting" about all
    the locks held by this process temporarily during an interrupt.
  - Close a more fatal race condition when removing a lock from a list.
    Removing a lock from the list entails both decrementing the count of
    items in this bucket as well as shuffling items in the current bucket up
    a notch to replace the gap left by the removed item.  Wrap these
    operations in a critical section.
  
  Revision  Changes    Path
  1.76      +40 -7     src/sys/kern/subr_witness.c


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