From: Michal Sudolsky sudols...@gmail.com<mailto:sudols...@gmail.com>
> But this fallback would cause UB unless all access to t_nRecursionDepth is > atomic or guarded by mutex. If we want to avoid UB in the multithreaded world, I’m afraid we will have to make a C++11 compiler a requirement, as C++03 never acknowledged the existence of threads. (That is not limited to this place, a lot of methods like PdfEncodingFactory::GlobalPdfRomanEncodingInstance are not currently threadsafe in C++03, as discussed earlier.) Now, if we do that, the solution is easy, make the variables used with the recursion guard thread_local. (Atomic or mutex are not a good solution, as those would make the recursion guard depend on what other threads are doing at the same time.) Cheers, Christopher The MathWorks GmbH | Friedlandstr.18 | 52064 Aachen | District Court Aachen | HRB 8082 | Managing Directors: Bertrand Dissler, Steven D. Barbo, Jeanne O’Keefe
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