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Date: Wed, 24 Aug 2005 10:27:32 -0500 (CDT)
From: Sergey Babkin <babkin@verizon.net>
To: Jeremie Le Hen <jeremie@le-hen.org>, Warner Losh <imp@bsdimp.com>
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Cc: deischen@FreeBSD.org, freebsd-hackers@FreeBSD.org, lists@nbux.com
Subject: Re: Re: nagios and freebsd threads issue : help please ...
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>> > This is funny, because nagios apparently runs properly on Linux, HPUX,
>> > Solaris, Irix, AIX and Tru64. To me that seems to indicate that Nagios

This does not neccessary mean that it _really_ works.
There might be a race involved that usually ends up
lucky on these systems.

>> > is very portable indeed and that the BSD fellows somehow botched it. I
>> > might be wrong, but...
>> 
>> Just because it works doesn't make it standards conforming.
>> 
>> Maybe there's some simple extension that can be implemented to help
>> the situation.
>
>It seems the main problem of the Nagios developper seems to be they
>would need to rewrite a big part of their current implementation.
>I'm not sure however this is mandatory.  I wonder if the so-told
>pthread_atfork() handler wouldn't be a quick solution to address the
>problem.  Sorry if it's dumb.

I'd even say that it's the proper correct solution. 
This probably should me made a part of "how to write thread-safe libraries":
register pthread_atfork() function that would free every possible
mutex and conditional in the library.
And clean up the other state too.

-SB