K 10
svn:author
V 7
glebius
K 8
svn:date
V 27
2005-08-30T09:51:54.000000Z
K 7
svn:log
V 550
Lock down PPTP node, since it has many data structures, that won't survive
parallel ng_pptp_rcvdata():

- Add a per-node mutex.
- Acquire mutex during all ng_pptp_rcvdata() method.
- Make callouts protected by mutex. Now callouts count as
  netgraph writers, but there are plans to allow reader callouts
  for nodes, that have internal locking.
- Acquire mutex in ng_pptp_reset(), which can be triggered
  by a message or node shutdown.

PR:		kern/80035
Tested by:	Deomid Ryabkov <myself rojer.pp.ru>
Reviewed by:	Deomid Ryabkov <myself rojer.pp.ru>

END