Re: [Fwd: Re: Thread Safe Lexer]

[Guy Harris <guy () alum mit edu>]

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.

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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