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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