tcpdump mailing list archives
[Fwd: Re: Thread Safe Lexer]
From: Behdad Forghani <behdad.forghani () samsarasol com>
Date: Wed, 01 Jul 2009 15:04:49 -0400
Hello,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/ Let me know if you want me to help any further. Best Regards, Behdad----- Original Message ----- From: "Behdad Forghani" <behdad.forghani () samsarasol com>
To: <gianluca.varenni () cacetech com> Sent: Monday, June 29, 2009 12:53 PM Subject: Thread Safe Lexer
Hi Gianluca,As you remembered, we discussed thread safe lexer during Sharkfest. You can use flex++ to generate C++ code that is thread safe. If you want more information let me know.Another good tool to make thread safe lexers is re2c.
Using flex++ is probably a no/no, since it generates C++, and libpcap is strictly C code.
How many changes would be needed to use re2c instead of flex/bison?Also, I think it would be great to move this discussion to the tcpdump-workers mailing list, where all the libpcap folks hang out.
Have a nice day GV
I had wrongly mentioned lemon, lemon generates thread safe parser and not lexer.Let me know if you need any help. Regards,Behdad
- This is the tcpdump-workers list. Visit https://cod.sandelman.ca/ to unsubscribe.
Current thread:
- [Fwd: Re: Thread Safe Lexer] Behdad Forghani (Jul 01)
- Re: [Fwd: Re: Thread Safe Lexer] Guy Harris (Jul 01)
- Re: [Fwd: Re: Thread Safe Lexer] Gianluca Varenni (Jul 01)
- Re: [Fwd: Re: Thread Safe Lexer] Eloy Paris (Jul 01)
- Re: [Fwd: Re: Thread Safe Lexer] Gianluca Varenni (Jul 01)
- Re: [Fwd: Re: Thread Safe Lexer] Eloy Paris (Jul 01)
- Re: [Fwd: Re: Thread Safe Lexer] Sam Roberts (Jul 02)
- Re: [Fwd: Re: Thread Safe Lexer] Gianluca Varenni (Jul 09)
- Re: [Fwd: Re: Thread Safe Lexer] Guy Harris (Jul 09)
- Re: [Fwd: Re: Thread Safe Lexer] Gianluca Varenni (Jul 09)
- Re: [Fwd: Re: Thread Safe Lexer] Gianluca Varenni (Jul 13)
- Re: [Fwd: Re: Thread Safe Lexer] Sam Roberts (Jul 02)
- Re: [Fwd: Re: Thread Safe Lexer] Guy Harris (Jul 01)