MB> No, because they're using different copies of rc.  It is possible
 MB> though, that str is changed, since the declaration of str isn't shown
 MB> here, I assume it's not an auto variable. 

 PC> str is part of a class.

Therefor, you need to semaphore str, not rc.  If str is a member variable
for the class, yes, you need to semaphore it if that object may be used in
more than one thread.


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