Multithreading Segfaults :(

[Steven D. Morrey]

Right but that moves out of the area of a simple patch and into something significantly more complex.
I'm trying to avoid doing that, because we're still dealing with 2.7 here, but  I agree with you, it's the proper way of doing it.

If this works, when my employer moves to the 3x branch, I'll look at reworking it that way.

Sincerely,
Steve
________________________________________
From: Andreas Ericsson [ae at op5.se]
Sent: Thursday, August 20, 2009 3:00 AM
To: Nagios Developers List
Subject: Re: [Nagios-devel] Multithreading Segfaults :(

Steven D. Morrey wrote:
> I think I've got it mostly worked out now. Turns out lots of
> functions call eachother, thereby producing a race.  The trick seems
> to be to ONLY lock the sections of code dealing directly with macro_x
> and not just the entire function dealing with macro_x itself. I'm
> going to give it  12hrs of run time and then I'll get a patch up for
> testing.
>

The "right" way of doing that is to lock down the global arrays in a
single file and then publish a thread-safe API to manipulate it. The
thread-safeness can be taken care of by the simple expedient of adding
locks to start with, and later one can modify the functions so that
hostnames etc are added in a function-local stack-allocated array
instead, which could potentially increase performance quite a lot
(and also reduce memory fragmentation quite a bit).

--
Andreas Ericsson                   andreas.ericsson at op5.se
OP5 AB                             www.op5.se
Tel: +46 8-230225                  Fax: +46 8-230231

Considering the successes of the wars on alcohol, poverty, drugs and
terror, I think we should give some serious thought to declaring war
on peace.

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