//
// ********************************************************************
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// * the Geant4 Collaboration.  It is provided  under  the terms  and *
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//
// class description:
//
//      This class is used for multi-threaded Geant4.
//      It encapsulates the mechanism of starting/stopping threads.

#ifndef G4UserWorkerThreadInitialization_hh
#define G4UserWorkerThreadInitialization_hh

class G4VUserPrimaryGeneratorAction;
class G4UserRunAction;
class G4UserEventAction;
class G4UserStackingAction;
class G4UserTrackingAction;
class G4UserSteppingAction;

class G4WorkerThread;
class G4WorkerRunManager;

#include "G4Threading.hh"
#include "Randomize.hh"

class G4UserWorkerThreadInitialization {
public: // with description
    G4UserWorkerThreadInitialization();
    virtual ~G4UserWorkerThreadInitialization();

    virtual G4Thread* CreateAndStartWorker(G4WorkerThread* workerThreadContext);
    //  Called by the kernel to create a new thread/worker
    //  and start work.
    // Usere should not re-implement this function (in derived class), except only if he/she
    // wants to verwrite the default threading model (see StartThread function)

    virtual void SetupRNGEngine(const CLHEP::HepRandomEngine* aRNGEngine) const;
    // Called by worker threads to set the Random Number Generator Engine
    // The default implementation "clones" the engine from the master thread
    // User needs to re-implement this method if using a non-standard
    // RNG Engine (i.e. a different one w.r.t. the one provided in the CLHEP
    // version supported by G4.
    // Important: this method is called by all threads at the same time
    //   if is user responsibilitiy to make it thread-safe

    virtual void JoinWorker(G4Thread* aThread);
    // Called by the kernel when threads need to be terminated. Implements logic of
    // joining the aThread. Calling thread will wait for aThread to end.
    // Usere should not re-implement this function (in derived class), except only if he/she
    // wants to verwrite the default threading model (see StartThread function)
    
    virtual G4WorkerRunManager* CreateWorkerRunManager() const;
    // Called by StartThread function to create a run-manager implementing worker behvior.
    // User should re-implemtn this function in derived class to instantiate his/her
    // user-defined WorkerRunManager.
    // By default this method instantiates G4WorkerRunManager object.

};
    
#endif //G4UserWorkerThreadInitialization_hh

