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| 1 | $Id: BUG.userStackingAction,v 1.1 2002/03/05 15:22:07 gcosmo Exp $
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| 2 | -------------------------------------------------------------------
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| 3 | When Geant4 4.0 sees empty event, it still calls userStackingAction.
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| 4 |
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| 5 | In the function:
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| 6 | G4StackManager::PopNextTrack(G4VTrajectory**newTrajectory)
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| 7 |
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| 8 | in Geant4 4.0, one has:
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| 9 |
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| 10 | 145 if(userStackingAction) userStackingAction->NewStage();
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| 11 | 146 #ifdef G4VERBOSE
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| 12 | 147 if( verboseLevel > 0 ) G4cout << " " << GetNUrgentTrack()
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| 13 | 148 << " urgent tracks and " << GetNWaitingTrack()
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| 14 | 149 << " waiting tracks." << G4endl;
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| 15 | 150 #endif
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| 16 | 151 if( ( GetNUrgentTrack()==0 ) && ( GetNWaitingTrack()==0 ) ) return 0;
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| 17 |
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| 18 | It seems to me that the call, `return 0' (line 151), should occur before
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| 19 | the call to `NewStage()' (line 145). If there are no tracks to
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| 20 | be stacked (neither GetNUrgentTrack() nor GetNWaitingTrack()),
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| 21 | then there is no new stage. So, it's a mistake to call
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| 22 | userStackingAction->NewStage().
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| 23 |
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| 24 | This affects my parallelization of Geant4, in which I need to purposely
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| 25 | create a trivial event on the master, and call
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| 26 | G4EventManager()::ProcessOneEvent() on it to initialize the event on the
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| 27 | master. I am doing this in order to copy the hits from the slave into
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| 28 | an event on the master.
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