Make `unp_msgcount' and `unp_file' protection with `unp_gc_lock'

rwlock(9).

This save us from from races provided by unlocked access to the `f_count'
which cause false marking alive socket as dead. We always modify `f_count'
and `unp_msgcount' together so the `f_count' modification should also pass
the `unp_gc_rwlock' before `unp_msgcount' increment and after
`unp_msgcount' decrement. The locked `unp_file' assignment avoids us from
drain unp_gc() run.

This moves unp_gc() locking back when these wariables were protected with
the same lock which was taken for all garbage collector run but uses
another lock not `unp_lock'.

ok kettenis@ bluhm@

0 files changed, 0 insertions, 0 deletions