abort() calls from messaging code

[Volker Lendecke]

On Thu, Jun 15, 2017 at 11:31:32AM -0700, Jeremy Allison via samba-technical wrote:
> OK, just wanna write this down (and may append the commit message)
> just to prove I understand the fix (please confirm :-).

Full Ack on the whole mail :-)

Thanks for writing it down. I had tried to do the handover from the
helper thread to the main thread in a simpler way, but I really could
not find any that would survive all tests that I did at the time. In
particular I tried hard to avoid the event_ctx_mutex, but that seems
difficult to achieve if you want to be able to destroy a pthreadpool
or event context while threads are blocked hard somewhere and
eventually wake up.

Volker

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