reentrant scanners?

gneuner@my-dejanews.com
13 Aug 1998 22:09:28 -0400

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reentrant scanners? gneuner@my-dejanews.com (1998-08-13)
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From: gneuner@my-dejanews.com
Newsgroups: comp.compilers
Date: 13 Aug 1998 22:09:28 -0400
Organization: Deja News - The Leader in Internet Discussion
Keywords: lex, C, question, comment

I have an application which requires several interactive server
threads to simultaneously parse commands from different sources. I
know that Bison can produce a reentrant parser, but the Flex
documentation is unclear on reentrancy. Is it possible (through macro
tricks if necessary) to create a reentrant ("C" only) scanner with
Flex 2.5 whose code could be shared between the threads?


I have also looked at using Antlr/Dlg for the parser, but the
available documentation for v1.33 (I don't have the book) is terrible.
Can the Antlr/Dlg combination be used to produce fully reentrant
parsers?


This is for an embedded application running on a CPU without memory
protection and with limited memory. The command processors must be
threads in a single executable and must be able to share the code.


Thanks,
George
[Flex generates reentrant scanner classes in C++, but I don't know of
any easy way to do it in C. -John]
--

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