Date: Fri, 16 Aug 2002 22:55:57 -0700 (PDT) From: Mike Harding <mvh@ix.netcom.com> To: sobomax@FreeBSD.org Cc: gnome@FreeBSD.org Subject: Re: ports/41209: www/mozilla browser serializes DNS lookups Message-ID: <20020817055557.EAC73132D2@netcom1.netcom.com> In-Reply-To: <200208081220.g78CK41R014319@freefall.freebsd.org> (message from Maxim Sobolev on Thu, 8 Aug 2002 05:20:04 -0700 (PDT)) References: <200208081220.g78CK41R014319@freefall.freebsd.org>
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Err.. the man page for geaddrinfo least on -STABLE, sez:
BUGS
The current implementation is not thread-safe.
- Mike H.
Date: Thu, 8 Aug 2002 05:20:04 -0700 (PDT)
Cc:
From: Maxim Sobolev <sobomax@FreeBSD.org>
Reply-To: Maxim Sobolev <sobomax@FreeBSD.org>
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The following reply was made to PR ports/41209; it has been noted by GNATS.
From: Maxim Sobolev <sobomax@FreeBSD.org>
To: freebsd-gnats-submit@FreeBSD.org, agapon@excite.com
Cc:
Subject: Re: ports/41209: www/mozilla browser serializes DNS lookups
Date: Thu, 08 Aug 2002 15:18:13 +0300
Andriy,
Unfortunately, closer look at FreeBSD dns lookup code revealed that
gethostbyXXX(3) family of functions aren't thread-safe, as they return
pointers to a static storage. Therefore, applying the patch "as is"
could lead to potential problems, when several threads will be trying
to call gethostbyname(3) simulateneously. The possible solutions are
to extend FreeBSD libc with gethostbyXXX_r(3) functions, similar to
ones present in other unices out there (Solaris, HP-UX, BSDI), or to
modify gethostbyXXX(3) functions to return pointers to a per thread
storage.
Another approach is to modify Mozilla to use getaddrinfo(3) function,
which is available on BSDs and is thread-safe by design, instead of
gethostbyname(3).
-Maxim
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