Re: [Fwd: Re: Thread Safe Lexer]

[Eloy Paris <peloy () chapus net>]

Hi Gianluca,

On Wed, Jul 01, 2009 at 12:54:13PM -0700, Gianluca Varenni wrote:

> ----- 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?

I believe Flex has been able to generate re-entrant code for while now.
Fedora 10 shipped Flex 2.5.35, which is definitely able to generate
re-entrant code.

Even Fedora 7 has a Flex (2.5.33) capable of generating re-entrant code.

Cheers,

Eloy Paris.-
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