From owner-freebsd-stable@FreeBSD.ORG  Sat Sep 13 18:34:48 2003
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Date: Sat, 13 Sep 2003 21:34:44 -0400 (EDT)
From: Mikhail Kruk <meshko@cs.brandeis.edu>
To: "Marc G. Fournier" <scrappy@hub.org>
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cc: freebsd-stable@freebsd.org
Subject: Re: thread safe functions missing ... ?
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>  Your gethostbyname() is _not_ thread-safe
> Your getpwuid() is _not_ thread-safe

both functions have never been thread safe on Unix. 
There is getpwuid_r in CURRENT.
There is a pr about gethostbyname not being thread safe:
http://www.freebsd.org/cgi/query-pr.cgi?pr=18824

I guess for now you'll need to protect them by a mutex manually.