K 10
svn:author
V 7
rwatson
K 8
svn:date
V 27
2009-02-06T12:24:30.424661Z
K 7
svn:log
V 745
Merge r184488 from head to stable/7:

  Break out single audit_pipe_mtx into two types of locks: a global rwlock
  protecting the list of audit pipes, and a per-pipe mutex protecting the
  queue.

  Likewise, replace the single global condition variable used to signal
  delivery of a record to one or more pipes, and add a per-pipe condition
  variable to avoid spurious wakeups when event subscriptions differ
  across multiple pipes.

  This slightly increases the cost of delivering to audit pipes, but should
  reduce lock contention in the presence of multiple readers as only the
  per-pipe lock is required to read from a pipe, as well as avoid
  overheading when different pipes are used in different ways.

  Sponsored by: Apple, Inc.

END