Method G4VisSubThread

source/visualization/management/src/G4VisManager.cc:1909–1991

G4ThreadFunReturnType G4VisManager::G4VisSubThread(G4ThreadFunArgType p)
{
#ifdef G4MULTITHREADED
  G4VisManager* pVisManager = (G4VisManager*)p;
  G4VSceneHandler* pSceneHandler = pVisManager->GetCurrentSceneHandler();
  if (!pSceneHandler) return 0;
  G4Scene* pScene = pSceneHandler->GetScene();
  if (!pScene) return 0;
  G4VViewer* pViewer = pVisManager->GetCurrentViewer();
  if (!pViewer) return 0;

  G4UImanager::GetUIpointer()->SetUpForSpecialThread("G4VIS");

  // Set up geometry and navigation for a thread
  G4GeometryWorkspace::GetPool()->CreateAndUseWorkspace();
  G4SolidsWorkspace::GetPool()->CreateAndUseWorkspace();
  G4Navigator* navigator = G4TransportationManager::GetTransportationManager()
                             ->GetNavigatorForTracking();
  navigator->SetWorldVolume(
    G4RunManagerFactory::GetMasterRunManagerKernel()->GetCurrentWorld());

  pViewer->SwitchToVisSubThread();

  while (true) {

    G4MUTEXLOCK(&mtVisSubThreadMutex);
    std::size_t eventQueueSize = mtVisEventQueue.size();
    G4MUTEXUNLOCK(&mtVisSubThreadMutex);
    // G4cout << "Event queue size (A): " << eventQueueSize << G4endl;

    while (eventQueueSize) {

      G4MUTEXLOCK(&mtVisSubThreadMutex);
      const G4Event* event = mtVisEventQueue.front();
      G4MUTEXUNLOCK(&mtVisSubThreadMutex);

      // Here comes the event drawing
      pVisManager->SetTransientsDrawnThisEvent(false);
      pSceneHandler->SetTransientsDrawnThisEvent(false);

      // We are about to draw the event (trajectories, etc.), but first we
      // have to clear the previous event(s) if necessary.  If this event
      // needs to be drawn afresh, e.g., the first event or any event when
      // "accumulate" is not requested, the old event has to be cleared.
      // We have postponed this so that, for normal viewers like OGL, the
      // previous event(s) stay on screen until this new event comes
      // along.  For a file-writing viewer the geometry has to be drawn.
      // See, for example, G4FRSCENEHANDLER::ClearTransientStore.
      pVisManager->ClearTransientStoreIfMarked();

      // Now draw the event...
      pSceneHandler->DrawEvent(event);
      ++pVisManager->fNoOfEventsDrawnThisRun;

      // Then pop and release event
      G4MUTEXLOCK(&mtVisSubThreadMutex);
      mtVisEventQueue.pop_front();
      pVisManager->EndOfEventCleanup(event);