G4WorkerRunManager.cc

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#include "G4WorkerRunManager.hh"
#include "G4WorkerRunManagerKernel.hh"
#include "G4UImanager.hh"
#include "G4VUserDetectorConstruction.hh"
#include "G4MTRunManager.hh"
#include "G4ScoringManager.hh"
#include "G4TransportationManager.hh"
#include "G4ParallelWorldProcess.hh"
#include "G4WorkerThread.hh"
#include "G4VUserPhysicsList.hh"
#include "G4VUserActionInitialization.hh"
#include "G4UserWorkerInitialization.hh"
#include "G4UserWorkerThreadInitialization.hh"
#include "G4UserRunAction.hh"
#include "G4RNGHelper.hh"
#include "G4Run.hh"
#include "G4VUserPrimaryGeneratorAction.hh"
#include "G4VVisManager.hh"
#include "G4SDManager.hh"
#include "G4VScoreNtupleWriter.hh"
#include "G4VScoringMesh.hh"
#include "G4Timer.hh"
#include "G4TiMemory.hh"
#include <sstream>
#include <fstream>

G4WorkerRunManager* G4WorkerRunManager::GetWorkerRunManager()
{ return static_cast<G4WorkerRunManager*>(G4RunManager::GetRunManager()); }

G4WorkerRunManagerKernel* G4WorkerRunManager::GetWorkerRunManagerKernel()
{ return static_cast<G4WorkerRunManagerKernel*>(GetWorkerRunManager()->kernel); }

G4WorkerRunManager::G4WorkerRunManager() : G4RunManager(workerRM)
{
    // This constructor should never be called in non-multithreaded mode

#ifndef G4MULTITHREADED
    G4ExceptionDescription msg;
    msg<<"Geant4 code is compiled without multi-threading support (-DG4MULTITHREADED is set to off).";
    msg<<" This type of RunManager can only be used in mult-threaded applications.";
    G4Exception("G4WorkerRunManager::G4WorkerRunManager()","Run0103",FatalException,msg);
#endif
    G4ParticleTable::GetParticleTable()->WorkerG4ParticleTable();
    G4ScoringManager* masterScM = G4MTRunManager::GetMasterScoringManager();
    if(masterScM) G4ScoringManager::GetScoringManager(); //TLS instance for a worker

    eventLoopOnGoing = false;
    runIsSeeded = false;
    nevModulo = -1;
    currEvID = -1;
    workerContext = 0;
    readStatusFromFile = false;

    // Properly initialise luxury level for Ranlux* engines...
    //
    if ( dynamic_cast<const CLHEP::Ranlux64Engine*>(G4Random::getTheEngine()) )
    {
      const CLHEP::Ranlux64Engine* theEngine = dynamic_cast<const CLHEP::Ranlux64Engine*>(G4Random::getTheEngine());
      luxury = theEngine->getLuxury();
    }
    else if ( dynamic_cast<const CLHEP::RanluxEngine*>(G4Random::getTheEngine()) )
    {
      const CLHEP::RanluxEngine* theEngine = dynamic_cast<const CLHEP::RanluxEngine*>(G4Random::getTheEngine());
      luxury = theEngine->getLuxury();
    }
    else
    {
      luxury = -1;
    }

    G4UImanager::GetUIpointer()->SetIgnoreCmdNotFound(true);

#ifdef G4MULTITHREADED
    G4VVisManager* pVVis = G4VVisManager::GetConcreteInstance();
    if(pVVis)
    {
      pVVis->SetUpForAThread();
      visIsSetUp = true;
    }
    else
    { visIsSetUp = false; }
#endif
}

#include "G4MTRunManager.hh"

G4WorkerRunManager::~G4WorkerRunManager()
{
    // Delete thread-local data process manager objects
    physicsList->TerminateWorker();
//    physicsList->RemoveProcessManager();

    //Put these pointers to zero: owned by master thread
    //If not to zero, the base class destructor will attempt to
    //delete them
    userDetector = 0;
    userWorkerInitialization = 0;
    userWorkerThreadInitialization = 0;
    userActionInitialization = 0;
    physicsList = 0;
    if(verboseLevel>0) G4cout<<"Destroying WorkerRunManager ("<<this<<")"<<G4endl;
}


void G4WorkerRunManager::InitializeGeometry() {
    if(!userDetector)
    {
        G4Exception("G4RunManager::InitializeGeometry", "Run0033",
                    FatalException, "G4VUserDetectorConstruction is not defined!");
        return;
    }
    if(fGeometryHasBeenDestroyed) 
    { G4TransportationManager::GetTransportationManager()->ClearParallelWorlds(); }

    //Step1: Get pointer to the physiWorld (note: needs to get the "super pointer, i.e. the one shared by all threads"
    G4RunManagerKernel* masterKernel = G4MTRunManager::GetMasterRunManagerKernel();
    G4VPhysicalVolume* worldVol = masterKernel->GetCurrentWorld();
    //Step2:, Call a new "WorkerDefineWorldVolume( pointer from 2-, false); 
    kernel->WorkerDefineWorldVolume(worldVol,false);
    kernel->SetNumberOfParallelWorld(masterKernel->GetNumberOfParallelWorld());
    //Step3: Call user's ConstructSDandField()
    userDetector->ConstructSDandField();
    userDetector->ConstructParallelSD();
    geometryInitialized = true;
}

#include "G4ParallelWorldProcessStore.hh"

void G4WorkerRunManager::RunInitialization()
{
    TIMEMORY_AUTO_TIMER("");
#ifdef G4MULTITHREADED
  if(!visIsSetUp)
  {
    G4VVisManager* pVVis = G4VVisManager::GetConcreteInstance();
    if(pVVis)
    {
      pVVis->SetUpForAThread();
      visIsSetUp = true;
    }
  }
#endif

  if(!(kernel->RunInitialization(fakeRun))) return;

  //Signal this thread can start event loop.
  //Note this will return only when all threads reach this point
  G4MTRunManager::GetMasterRunManager()->ThisWorkerReady();
  if(fakeRun) return;

  const G4UserWorkerInitialization* uwi
       = G4MTRunManager::GetMasterRunManager()->GetUserWorkerInitialization();
  CleanUpPreviousEvents();
  if(currentRun) delete currentRun;
  currentRun = 0;

  if(fGeometryHasBeenDestroyed) G4ParallelWorldProcessStore::GetInstance()->UpdateWorlds();
  //Call a user hook: this is guaranteed all threads are "synchronized"
  if(uwi) uwi->WorkerRunStart();

  if(userRunAction) currentRun = userRunAction->GenerateRun();
  if(!currentRun) currentRun = new G4Run();

  currentRun->SetRunID(runIDCounter);
  currentRun->SetNumberOfEventToBeProcessed(numberOfEventToBeProcessed);

  currentRun->SetDCtable(DCtable);
  G4SDManager* fSDM = G4SDManager::GetSDMpointerIfExist();
  if(fSDM)
  { currentRun->SetHCtable(fSDM->GetHCtable()); }

  if ( G4VScoreNtupleWriter::Instance() )
  {
    auto hce = fSDM->PrepareNewEvent();
    isScoreNtupleWriter = G4VScoreNtupleWriter::Instance()->Book(hce);
    delete hce;
  }

  std::ostringstream oss;
    G4Random::saveFullState(oss);
  randomNumberStatusForThisRun = oss.str();
  currentRun->SetRandomNumberStatus(randomNumberStatusForThisRun);

  for(G4int i_prev=0;i_prev<n_perviousEventsToBeStored;i_prev++)
  { previousEvents->push_back((G4Event*)0); }

  if(printModulo>0 || verboseLevel>0)
  {
    G4cout << "### Run " << currentRun->GetRunID() << " starts on worker thread "
           << G4Threading::G4GetThreadId() << "." << G4endl;
  }
  if(userRunAction) userRunAction->BeginOfRunAction(currentRun);

  if (isScoreNtupleWriter)  {
    G4VScoreNtupleWriter::Instance()->OpenFile();
  }

  if(storeRandomNumberStatus) {
      G4String fileN = "currentRun";
      if ( rngStatusEventsFlag ) {
          std::ostringstream os;
          os << "run" << currentRun->GetRunID();
          fileN = os.str();
      }
      StoreRNGStatus(fileN);
  }

  runAborted = false;
  numberOfEventProcessed = 0;
}

void G4WorkerRunManager::DoEventLoop(G4int n_event, const char* macroFile , G4int n_select)
{
    TIMEMORY_AUTO_TIMER("");
    if(!userPrimaryGeneratorAction)
    {
      G4Exception("G4RunManager::GenerateEvent()", "Run0032", FatalException,
                "G4VUserPrimaryGeneratorAction is not defined!");
    }

    //This is the same as in the sequential case, just the for-loop indexes are
    //different
    InitializeEventLoop(n_event,macroFile,n_select);

    // Reset random number seeds queue
    while(seedsQueue.size()>0)
    { seedsQueue.pop(); }
    // for each run, worker should receive at least one set of random number seeds.
    runIsSeeded = false; 

    // Event loop
    eventLoopOnGoing = true;
    G4int i_event = -1;
    nevModulo = -1;
    currEvID = -1;

    while(eventLoopOnGoing)
    {
      ProcessOneEvent(i_event);
      if(eventLoopOnGoing)
      {
        TerminateOneEvent();
        if(runAborted)
        { eventLoopOnGoing = false; }
      }
    }
     
    TerminateEventLoop();
}

void G4WorkerRunManager::ProcessOneEvent(G4int i_event)
{
    TIMEMORY_AUTO_TIMER("");
  currentEvent = GenerateEvent(i_event);
  if(eventLoopOnGoing)
  {  
    eventManager->ProcessOneEvent(currentEvent);
    AnalyzeEvent(currentEvent);
    UpdateScoring();
    if(currentEvent->GetEventID()<n_select_msg) G4UImanager::GetUIpointer()->ApplyCommand(msgText);
  }
}

G4Event* G4WorkerRunManager::GenerateEvent(G4int i_event)
{
    TIMEMORY_AUTO_TIMER("");
  G4Event* anEvent = new G4Event(i_event);
  long s1 = 0;
  long s2 = 0;
  long s3 = 0;
  G4bool eventHasToBeSeeded = true;
  if(G4MTRunManager::SeedOncePerCommunication()==1 && runIsSeeded)
  { eventHasToBeSeeded = false; }

  if(i_event<0)
  {
    G4int nevM = G4MTRunManager::GetMasterRunManager()->GetEventModulo();
    if(nevM==1)
    {
      eventLoopOnGoing = G4MTRunManager::GetMasterRunManager()
                       ->SetUpAnEvent(anEvent,s1,s2,s3,eventHasToBeSeeded);
      runIsSeeded = true;
    }
    else
    {
      if(nevModulo<=0)
      {
        G4int nevToDo = G4MTRunManager::GetMasterRunManager()
                         ->SetUpNEvents(anEvent,&seedsQueue,eventHasToBeSeeded);
        if(nevToDo==0)
        { eventLoopOnGoing = false; }
        else
        {
          currEvID = anEvent->GetEventID();
          nevModulo = nevToDo - 1;
        }
      }
      else
      {
        if(G4MTRunManager::SeedOncePerCommunication()>0) eventHasToBeSeeded = false;
        anEvent->SetEventID(++currEvID);
        nevModulo--;
      }
      if(eventLoopOnGoing && eventHasToBeSeeded)
      {
        s1 = seedsQueue.front(); seedsQueue.pop();
        s2 = seedsQueue.front(); seedsQueue.pop();
      }
    }

    if(!eventLoopOnGoing)
    {
      delete anEvent;
      return 0;
    }
  }
  else if(eventHasToBeSeeded)
  {
    //Need to reseed random number generator
    G4RNGHelper* helper = G4RNGHelper::GetInstance();
    s1 = helper->GetSeed(i_event*2);
    s2 = helper->GetSeed(i_event*2+1);
  }

  if(eventHasToBeSeeded) 
  {
    long seeds[3] = { s1, s2, 0 };
    G4Random::setTheSeeds(seeds,luxury);
    runIsSeeded = true;
  }

  //Read from file seed.
  //Andrea Dotti 4 November 2015
  //This is required for strong-reproducibility, in MT mode we have that each
  //thread produces, for each event a status file, we want to do that.
  //Search a random file with the format run{%d}evt{%d}.rndm

  //This is the filename base constructed from run and event
  const auto filename = [&] {
    std::ostringstream os;
    os << "run"<<currentRun->GetRunID() << "evt" << anEvent->GetEventID();
    return os.str();
  };

  G4bool RNGstatusReadFromFile = false;
 if ( readStatusFromFile ) {
   //Build full path of RNG status file for this event
   std::ostringstream os;
   os << filename() << ".rndm";
   const G4String& randomStatusFile = os.str();
   std::ifstream ifile(randomStatusFile.c_str());
   if ( ifile ) { //File valid and readable
     RNGstatusReadFromFile = true;
     G4Random::restoreEngineStatus(randomStatusFile.c_str());
   }
 }


  if(storeRandomNumberStatusToG4Event==1 || storeRandomNumberStatusToG4Event==3)
  {
    std::ostringstream oss;
    G4Random::saveFullState(oss);
    randomNumberStatusForThisEvent = oss.str();
    anEvent->SetRandomNumberStatus(randomNumberStatusForThisEvent);
  }

  if(storeRandomNumberStatus && ! RNGstatusReadFromFile ) { //If reading from file, avoid to rewrite the same
      G4String fileN = "currentEvent";
      if ( rngStatusEventsFlag ) {
        fileN = filename();
      }
      StoreRNGStatus(fileN);
  }

  if(printModulo > 0 && anEvent->GetEventID()%printModulo == 0 )
  {
    G4cout << "--> Event " << anEvent->GetEventID() << " starts";
    if(eventHasToBeSeeded)
    { G4cout << " with initial seeds (" << s1 << "," << s2 << ")"; }
    G4cout << "." << G4endl;
  }
  userPrimaryGeneratorAction->GeneratePrimaries(anEvent);
  return anEvent;
}

void G4WorkerRunManager::MergePartialResults()
{
    //Merge partial results into global run
    G4MTRunManager* mtRM = G4MTRunManager::GetMasterRunManager();
    G4ScoringManager* ScM = G4ScoringManager::GetScoringManagerIfExist();
    if(ScM) mtRM->MergeScores(ScM);
    mtRM->MergeRun(currentRun);
}

void G4WorkerRunManager::RunTermination()
{
  if(!fakeRun)
  {
    MergePartialResults();
    
    //Call a user hook: note this is before the next barrier
    //so threads execute this method asyncrhonouzly
    //(TerminateRun allows for synch via G4RunAction::EndOfRun)
    const G4UserWorkerInitialization* uwi
       = G4MTRunManager::GetMasterRunManager()->GetUserWorkerInitialization();
    if(uwi) uwi->WorkerRunEnd();
  }

  G4RunManager::RunTermination();
  //Signal this thread has finished envent-loop.
  //Note this will return only whan all threads reach this point
  G4MTRunManager::GetMasterRunManager()->ThisWorkerEndEventLoop();

}

void G4WorkerRunManager::TerminateEventLoop()
{
    if(verboseLevel>0 && !fakeRun)
    {
        timer->Stop();
        G4cout << "Thread-local run terminated." << G4endl;
        G4cout << "Run Summary" << G4endl;
        if(runAborted)
        { G4cout << "  Run Aborted after " << numberOfEventProcessed << " events processed." << G4endl; }
        else
        { G4cout << "  Number of events processed : " << numberOfEventProcessed << G4endl; }
        G4cout << "  "  << *timer << G4endl;
    }
}

/****************************
void G4WorkerRunManager::BeamOn(G4int n_event,const char* macroFile,G4int n_select)
{ 
  if(n_event>0) 
  { G4RunManager::BeamOn(n_event,macroFile,n_select); }
  else
  {
    // fake BeamOn.
    G4MTRunManager::GetMasterRunManager()->ThisWorkerReady();
    G4MTRunManager::GetMasterRunManager()->ThisWorkerEndEventLoop();
  }
}
******************************/

#include "G4AutoLock.hh"
namespace { G4Mutex ConstructScoringWorldsMutex = G4MUTEX_INITIALIZER; }
void G4WorkerRunManager::ConstructScoringWorlds()
{
    using MeshShape = G4VScoringMesh::MeshShape;

    // Return if unnecessary
    G4ScoringManager* ScM = G4ScoringManager::GetScoringManagerIfExist();
    if(!ScM) return;
    G4int nPar = ScM->GetNumberOfMesh();
    if(nPar<1) return;

    // Update thread-local G4TransportationManager of all the world volumes
    kernel->WorkerUpdateWorldVolume();

    G4ScoringManager* masterScM = G4MTRunManager::GetMasterScoringManager();
    assert( masterScM != NULL );
    
    G4ParticleTable::G4PTblDicIterator* particleIterator
     = G4ParticleTable::GetParticleTable()->GetIterator();
    
    for(G4int iw=0;iw<nPar;iw++)
    {
      G4VScoringMesh* mesh = ScM->GetMesh(iw);
      if(fGeometryHasBeenDestroyed) mesh->GeometryHasBeenDestroyed();
      G4VPhysicalVolume* pWorld = nullptr;
      if(mesh->GetShape()!=MeshShape::realWorldLogVol)
      {
        pWorld = G4TransportationManager::GetTransportationManager()->IsWorldExisting(ScM->GetWorldName(iw));
        if(!pWorld)
        {
          G4ExceptionDescription ed;
          ed<<"Mesh name <"<<ScM->GetWorldName(iw)<<"> is not found in the master thread.";
          G4Exception("G4WorkerRunManager::ConstructScoringWorlds()","RUN79001",FatalException,ed);
        }
      }
      if(!(mesh->GetMeshElementLogical()))
      {
        G4AutoLock l(&ConstructScoringWorldsMutex);
        G4VScoringMesh* masterMesh = masterScM->GetMesh(iw);
        mesh->SetMeshElementLogical(masterMesh->GetMeshElementLogical());
        l.unlock();
        
        if(mesh->GetShape()!=MeshShape::realWorldLogVol)
        {
          G4ParallelWorldProcess* theParallelWorldProcess = mesh->GetParallelWorldProcess();
          if(theParallelWorldProcess)
          { theParallelWorldProcess->SetParallelWorld(ScM->GetWorldName(iw)); }
          else
          {
            theParallelWorldProcess = new G4ParallelWorldProcess(ScM->GetWorldName(iw));
            mesh->SetParallelWorldProcess(theParallelWorldProcess);
            theParallelWorldProcess->SetParallelWorld(ScM->GetWorldName(iw));

            particleIterator->reset();
            while( (*particleIterator)() ){
              G4ParticleDefinition* particle = particleIterator->value();
              G4ProcessManager* pmanager = particle->GetProcessManager();
              if(pmanager)
              {
                pmanager->AddProcess(theParallelWorldProcess);
                if(theParallelWorldProcess->IsAtRestRequired(particle))
                { pmanager->SetProcessOrdering(theParallelWorldProcess, idxAtRest, 9900); }
                pmanager->SetProcessOrderingToSecond(theParallelWorldProcess, idxAlongStep);
                pmanager->SetProcessOrdering(theParallelWorldProcess, idxPostStep, 9900);
              } //if(pmanager)
            }//while
          }
        }
      }
      mesh->WorkerConstruct(pWorld);
    }
}

void G4WorkerRunManager::SetUserInitialization(G4UserWorkerInitialization*)
{
    G4Exception("G4RunManager::SetUserInitialization(G4UserWorkerInitialization*)", "Run0118",
                FatalException, "This method should be used only with an instance of G4MTRunManager");
}

void G4WorkerRunManager::SetUserInitialization(G4UserWorkerThreadInitialization*)
{
    G4Exception("G4RunManager::SetUserInitialization(G4UserWorkerThreadInitialization*)", "Run0119",
                FatalException, "This method should be used only with an instance of G4MTRunManager");
}

void G4WorkerRunManager::SetUserInitialization(G4VUserActionInitialization*)
{
    G4Exception("G4RunManager::SetUserInitialization(G4VUserActionInitialization*)", "Run0120",
                FatalException, "This method should be used only with an instance of G4MTRunManager");
}

void G4WorkerRunManager::SetUserInitialization(G4VUserDetectorConstruction*)
{
    G4Exception("G4RunManager::SetUserInitialization(G4VUserDetectorConstruction*)", "Run0121",
                FatalException, "This method should be used only with an instance of G4MTRunManager");
}

void G4WorkerRunManager::SetUserInitialization(G4VUserPhysicsList* pl)
{
    pl->InitializeWorker();
    G4RunManager::SetUserInitialization(pl);
}

void G4WorkerRunManager::SetUserAction(G4UserRunAction* userAction)
{
    G4RunManager::SetUserAction(userAction);
    if(userAction) userAction->SetMaster(false);
}

void G4WorkerRunManager::SetupDefaultRNGEngine()
{
    const CLHEP::HepRandomEngine* mrnge = G4MTRunManager::GetMasterRunManager()->getMasterRandomEngine();
    assert(mrnge);//Master has created RNG
    const G4UserWorkerThreadInitialization* uwti
      =G4MTRunManager::GetMasterRunManager()->GetUserWorkerThreadInitialization();
    uwti->SetupRNGEngine(mrnge);
}


//Forward calls (avoid GCC compilation warnings)
void G4WorkerRunManager::SetUserAction(G4UserEventAction* ua)
{
    G4RunManager::SetUserAction(ua);
}

void G4WorkerRunManager::SetUserAction(G4VUserPrimaryGeneratorAction* ua)
{
    G4RunManager::SetUserAction(ua);
}

void G4WorkerRunManager::SetUserAction(G4UserStackingAction* ua)
{
    G4RunManager::SetUserAction(ua);
}

void G4WorkerRunManager::SetUserAction(G4UserTrackingAction* ua)
{
    G4RunManager::SetUserAction(ua);
}

void G4WorkerRunManager::SetUserAction(G4UserSteppingAction* ua)
{
    G4RunManager::SetUserAction(ua);
}

void G4WorkerRunManager::StoreRNGStatus(const G4String& fn )
{
    std::ostringstream os;
    os << randomNumberStatusDir << "G4Worker"<<workerContext->GetThreadId()<<"_"<<fn <<".rndm";
    G4Random::saveEngineStatus(os.str().c_str());
}

void G4WorkerRunManager::rndmSaveThisRun()
{
  G4int runNumber = 0;
  if(currentRun) runNumber = currentRun->GetRunID();
  if(!storeRandomNumberStatus)
  {
    G4cerr << "Warning from G4RunManager::rndmSaveThisRun():"
           << " Random number status was not stored prior to this run."
           << G4endl << "/random/setSavingFlag command must be issued. "
           << "Command ignored." << G4endl;
    return;
  }

  std::ostringstream oos;
  oos << "G4Worker" << workerContext->GetThreadId()
      << "_" << "currentRun.rndm" << "\0";
  G4String fileIn = randomNumberStatusDir + oos.str();

  std::ostringstream os;
  os << "run" << runNumber << ".rndm" << '\0';
  G4String fileOut = randomNumberStatusDir + os.str();

#ifdef WIN32
  G4String copCmd = "/control/shell copy " + fileIn + " " + fileOut;
#else
  G4String copCmd = "/control/shell cp " + fileIn + " " + fileOut;
#endif
  G4UImanager::GetUIpointer()->ApplyCommand(copCmd);
  if(verboseLevel > 0)
  { G4cout << fileIn << " is copied to " << fileOut << G4endl; }
}

void G4WorkerRunManager::rndmSaveThisEvent()
{
  if(currentEvent == 0)
  {
    G4cerr
      << "Warning from G4RunManager::rndmSaveThisEvent():"
      << " there is no currentEvent available."
      << G4endl << "Command ignored." << G4endl;
    return;
  }

  if(!storeRandomNumberStatus)
  {
    G4cerr
      << "Warning from G4RunManager::rndmSaveThisEvent():"
      << " Random number engine status is not available."
      << G4endl << "/random/setSavingFlag command must be issued "
      << "prior to the start of the run. Command ignored." << G4endl;
    return;
  }

  std::ostringstream oos;
  oos << "G4Worker" << workerContext->GetThreadId()
      << "_" << "currentEvent.rndm" << "\0";
  G4String fileIn = randomNumberStatusDir + oos.str();

  std::ostringstream os;
  os << "run" << currentRun->GetRunID() << "evt" << currentEvent->GetEventID()
     << ".rndm" << '\0';
  G4String fileOut = randomNumberStatusDir + os.str();
#ifdef WIN32
  G4String copCmd = "/control/shell copy " + fileIn + " " + fileOut;
#else
  G4String copCmd = "/control/shell cp " + fileIn + " " + fileOut;
#endif
  G4UImanager::GetUIpointer()->ApplyCommand(copCmd);
  if(verboseLevel > 0)
  { G4cout << fileIn << " is copied to " << fileOut << G4endl; }
}

void G4WorkerRunManager::DoWork()
{
    TIMEMORY_AUTO_TIMER("");
  G4MTRunManager* mrm = G4MTRunManager::GetMasterRunManager();
  G4MTRunManager::WorkerActionRequest nextAction = mrm->ThisWorkerWaitForNextAction();
  while( nextAction != G4MTRunManager::WorkerActionRequest::ENDWORKER )
  {
    if( nextAction == G4MTRunManager::WorkerActionRequest::NEXTITERATION ) // start the next run
    {
      //The following code deals with changing materials between runs
      static G4ThreadLocal G4bool skipInitialization = true;
      if(skipInitialization)
      {
        // re-initialization is not necessary for the first run
        skipInitialization = false;
      }
      else
      {
//        ReinitializeGeometry();
          workerContext->UpdateGeometryAndPhysicsVectorFromMaster();
      }

      // Execute UI commands stored in the master UI manager
      std::vector<G4String> cmds = mrm->GetCommandStack();
      G4UImanager* uimgr = G4UImanager::GetUIpointer(); //TLS instance
      std::vector<G4String>::const_iterator it = cmds.begin();
      for(;it!=cmds.end();it++)
      { uimgr->ApplyCommand(*it); }
      //Start this run
      G4int numevents = mrm->GetNumberOfEventsToBeProcessed();
      G4String macroFile = mrm->GetSelectMacro();
      G4int numSelect = mrm->GetNumberOfSelectEvents();
      if ( macroFile == "" || macroFile == " " )
      {
          this->BeamOn(numevents);
      }
      else
      {
          this->BeamOn(numevents,macroFile,numSelect);
      }
    }
    else if (nextAction == G4MTRunManager::WorkerActionRequest::PROCESSUI ) {
        std::vector<G4String> cmds = mrm->GetCommandStack();
        G4UImanager* uimgr = G4UImanager::GetUIpointer(); //TLS instance
        std::vector<G4String>::const_iterator it = cmds.begin();
        for(;it!=cmds.end();it++)
        { uimgr->ApplyCommand(*it); }
        mrm->ThisWorkerProcessCommandsStackDone();
    }
    else
    {
      G4ExceptionDescription d;
      d<<"Cannot continue, this worker has been requested an unknown action: "
       <<static_cast<std::underlying_type<G4MTRunManager::WorkerActionRequest>::type>(nextAction);
      G4Exception("G4WorkerRunManager::DoWork","Run0104",FatalException,d);
    }

    //Now wait for master thread to signal new action to be performed
    nextAction = mrm->ThisWorkerWaitForNextAction();
  } //No more actions to perform

  return;
}