Generated Lexers/Parsers and Multi-threading

Problem:
1. need to generate a lexer/parser from some grammar G
2. The lexer/parser must be rigged so that they are part of a C++ class
      that is called often with input from a *string*, not stdin.
3. Class in (2) must be thread-safe.




In looking at the code generated by lex/yacc it would appear the
generated code is NOT thread safe (lots of globals, etc.). This means
an app would have to put a mutex around calls to the parser, which
could kill performance.


Does bison or any other parser generators generate thread-safe code?


Thanks,
Chris
[Bison has a reentrant option which would probably do the trick. -John]
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