git: uipc: Use flag to indicate that the unpcb was detached/aborted.

[Sepherosa Ziehau]

commit 5df2d9a03d586f11deb1542d0ae28192c22a027b
Author: Sepherosa Ziehau <sephe at dragonflybsd.org>
Date:   Mon Aug 24 22:02:20 2015 +0800

    uipc: Use flag to indicate that the unpcb was detached/aborted.
    
    Since unpcb detach (so->so_pcb set to NULL) could be delayed by
    extra references, we use a flag to indicate that the unpcb was
    detached/aborted.  And hold per-unpcb token in uipc_detach() and
    uipc_abort(), since this flag is also checked in other uipc_userreq
    methods, e.g. uipc_send().
    
    This commit makes uipc_abort() reentrant.

Summary of changes:
 sys/kern/uipc_usrreq.c | 18 +++++++++++++++---
 sys/sys/unpcb.h        |  4 ++++
 2 files changed, 19 insertions(+), 3 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/5df2d9a03d586f11deb1542d0ae28192c22a027b


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