Re: [Fwd: Re: Thread Safe Lexer]

["Gianluca Varenni" <gianluca.varenni () cacetech com>]

----- Original Message ----- 
From: "Guy Harris" <guy () alum mit edu>
To: <tcpdump-workers () lists tcpdump org>
Sent: Wednesday, July 01, 2009 12:47 PM
Subject: Re: [tcpdump-workers] [Fwd: Re: Thread Safe Lexer]


> On Jul 1, 2009, at 12:04 PM, Behdad Forghani wrote:
>
> > Gianluca asked me to forward this to the mailing list. During 
> > Sharkfest09 he had mentioned that Winpcap cannot is not re-entrant  and 
> > thread-safe because Lex uses global variables. As you can see,  one 
> > solution to this is to use re2c for lexing and lemon for  parsing. The 
> > link to re2c is:
> > http://re2c.org/
> > http://sourceforge.net/projects/re2c/
>
> Newer versions of Flex can, I think, also generate reentrant C lexers, 
> but that would also require installing a new version of Flex on some 
> systems, so we'd have to require that you install additional tools on 
> some machines in either case.

By "newer versions" do you mean the version of flex that is shipped with, 
let's say, an up-to-date Linux distribution like my Fedora 10?

GV

> Wireshark already uses lemon for its display filter parser - it  includes 
> lemon source in its source tree, so it doesn't require that  you install 
> it.
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