git: uipc: Use token for rights counting

[Sepherosa Ziehau]

commit b4d93c31157e63c9cb52882c88a3589135d22eab
Author: Sepherosa Ziehau <sephe at dragonflybsd.org>
Date:   Fri Nov 6 16:04:16 2015 +0800

    uipc: Use token for rights counting
    
    This is mainly used to avoid races stemming from f_msgcount accessing
    w/o unp_spin.

Summary of changes:
 sys/kern/uipc_usrreq.c | 35 ++++++++++++++++++++---------------
 1 file changed, 20 insertions(+), 15 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/b4d93c31157e63c9cb52882c88a3589135d22eab


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