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Date:      Thu, 10 Aug 2000 22:02:53 -0600
From:      Wes Peters <wes@softweyr.com>
To:        Greg Thompson <johnnyteardrop@hotmail.com>
Cc:        freebsd-hackers@FreeBSD.ORG, freebsd-net@FreeBSD.ORG
Subject:   Re: threadsafe name resolution
Message-ID:  <39937AED.7A9DCAE@softweyr.com>
References:  <F3053sllNY30kkZIhTr000033b6@hotmail.com>

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Greg Thompson wrote:
> 
> i've just received confirmation from the author of the KAME resolution code
> that it isn't at all thread safe:
> 
> >Sure.  As noted in name6.c, thread related stuff is not implemented yet.
> >Since our resolver code based on bind4 doesn't aware thread safeness,
> >all I can do now would be only putting mutex, anyway.
> 
> sure enough, name6.c says:
> 
> /*
> * TODO for thread safe
> *       use mutex for _hostconf, _hostconf_init.
> *       rewrite resolvers to be thread safe
> */
> 
> now, i'd say that it's fairly important for some form of threadsafe name
> resolution to exist.  until the KAME code is fixed, how about adding in the
> ipv4 _r methods that have been discussed from time to time?  or, at the very
> least, put something in the manpage for getipnodebyname and friends
> indicating that the funcs are not threadsafe.
> 
> as you can probably tell, i wasted several hours worth of work bumping into
> this problem.

I've been working on fleshing out the _r routines for quite some time
now.  I've done all the easy ones, and the ones you're looking for 
are just screaming butt-ugly.  It would be simple enough to create a
mutex-protected variant of each, but that's not nearly as good a solution
as make a REAL _r implementation.

If you have implementations to offer, I'd be quite happy to review and
commit them.  I haven't had enough spare time to even crack the code in
months now, unfortunately.

-- 
            "Where am I, and what am I doing in this handbasket?"

Wes Peters                                                         Softweyr LLC
wes@softweyr.com                                           http://softweyr.com/


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