flex/bison multithreading issues

I have a few problems to resolve.


I need to generate a parser/interpreter that I can embed in a function
and call within multiple threads. It must be thread safe.


For example:


do_evaluate("(3+3)/2");


Inintialy I just need to do simple math expressions parser so that I
can work out the main problem.


Again..
I may run this function concurrently in multiple spawned processes,
thus it is important that the parser/interpreter code that is
generated is reentrant and thread safe. This means no global variables
and such.


Also..
I need to take flex and bison code that is generated and embed and
encapsulatate the entire code in a function to be run using the
expression as a parameter to the function.


Also..
It may now be obvious that the input is not going to be stdin. It will
be a string that is passed as a parameter.


Thanks for any advise
[Bison has an option to generate reentrant parsers. Flex will do so
if you tell it to make a C++ scanner, but needs hand tweaking for C
scanners. Reading from a string is easy and is well-documented in the
flex man page. -John]

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