EvtGen is a simulation generator specialized for decays of heavy hadrons. Since its early development in the 90’s, the generator has been extensively used and has become today an essential tool for heavy-flavour physics analyses. Throughout this time, its source code has remained mostly unchanged, except for additions of new decay models. In view of the upcoming boom of multi-threaded processing, we have launched a modernization campaign with the chief goal of making EvtGen thread safe. This talk will cover the challenges encountered in this endeavour and the milestones reached so far.
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