[PATCH 02/10] Add a BAN_Shutdown() routine that is called before STV_Close(), and makes sure that the ban lists will not change until we exit.

[Poul-Henning Kamp]

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In message <1349879243-30369-2-git-send-email-martin at varnish-software.com>, Mar
tin Blix Grydeland writes:

I'm not happy with this one, it risks creating a pile-up of workers
which are trying to add bans's from VCL, and it does not shut down
the lurker in any meaningful way.

Add a private flag in cache_ban.c which indicates that a shutdown
is in progress, set it in the BAN_Shutdown() function.

When this flag is set, all attempts to add bans should fail before
trying to grab the mutex.

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.