|Message: Re: Question on accessing G4 from different threads||Not Logged In (login)|
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BeamOn() does not only a simple event loop but also constructs cross-section tables, geometry voxelization, etc., that are shared over threads. Thus Geant4 is not designed to accept more than one BeamOn() simultaneously. For your use-case, I would suggest you to create your UserPrimaryGeneratorAction class that share a singleton vector of primary events. From your multithreaded framework, you can fill in primary events to this singleton vector using mutex.
Please note that this scenario works efficiently only if the speed of generating primary event is much faster than simulating one event with Geant4.
Hope this helps,
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