K 10
svn:author
V 7
rwatson
K 8
svn:date
V 27
2004-12-25T22:44:04.000000Z
K 7
svn:log
V 1431
Merge tcp_input.c:1.257, tcp_subr.c:1.211, tcp_timer.c:1.69 from HEAD
to RELENG_5:

  date: 2004/11/23 17:21:30;  author: rwatson;  state: Exp;  lines: +4 -0
  date: 2004/11/23 17:21:30;  author: rwatson;  state: Exp;  lines: +2 -0
  date: 2004/11/23 17:21:30;  author: rwatson;  state: Exp;  lines: +9 -0

  tcp_timewait() performs multiple non-atomic reads on the tcptw
  structure, so assert the inpcb lock associated with the tcptw.
  Also assert the tcbinfo lock, as tcp_timewait() may call
  tcp_twclose() or tcp_2msl_rest(), which require it.  Since
  tcp_timewait() is already called with that lock from tcp_input(),
  this doesn't change current locking, merely documents reasons for
  it.

  In tcp_twstart(), assert the tcbinfo lock, as tcp_timer_2msl_rest()
  is called, which requires that lock.

  In tcp_twclose(), assert the tcbinfo lock, as tcp_timer_2msl_stop()
  is called, which requires that lock.

  Document the locking strategy for the time wait queues in tcp_timer.c,
  which consists of protecting the time wait queues in the same manner
  as the tcbinfo structure (using the tcbinfo lock).

  In tcp_timer_2msl_reset(), assert the tcbinfo lock, as the time wait
  queues are modified.

  In tcp_timer_2msl_stop(), assert the tcbinfo lock, as the time wait
  queues may be modified.

  In tcp_timer_2msl_tw(), assert the tcbinfo lock, as the time wait
  queues may be modified.

  MFC after:      2 weeks

END