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 //
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 // * The  Geant4 software  is  copyright of the Copyright Holders  of *
 // * the Geant4 Collaboration.  It is provided  under  the terms  and *
 // * conditions of the Geant4 Software License,  included in the file *
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 //
 // G4PDefManager
 //
 // Class description:
 //
 // Utility template class for splitting read/write data for
 // thread-safety from classes: G4ParticleDefinition, G4VDecayChannel.
 //
 // The type G4PDefManager is introduced to encapsulate the methods used by
 // both the master thread and worker threads to allocate memory space for
 // the fields encapsulated by the class G4PDefData. When each thread
 // changes the value for these fields, it refers to them using a macro
 // definition defined below. For every G4ParticleDefinition instance,
 // there is a corresponding G4PDefData instance. All G4PDefData instances
 // are organized by the class G4PDefManager as an array.
 // The field "int g4particleDefinitionInstanceID" is added to the class
 // G4ParticleDefinition.
 // The value of this field in each G4ParticleDefinition instance is the
 // subscript of the corresponding G4PDefData instance.
 // In order to use the class G4PDefManager, we add a static member in the
 // class G4ParticleDefinition as follows:
 // "static G4PDefManager subInstanceManager".
 // Both the master thread and worker threads change the length of the array
 // for G4PDefData instances mutually along with G4ParticleDefinition
 // instances are created. For each worker thread, it dynamically creates ions.
 // Consider any thread A, if there is any other thread which creates an ion.
 // This ion is shared by the thread A. So the thread A leaves an empty space
 // in the array of G4PDefData instances for the ion.
 
 // Author: Xin Dong, 25.01.2009 - First implementation
 //                                from automatic MT conversion
 // --------------------------------------------------------------------
 #ifndef G4PDefManager_hh
 #define G4PDefManager_hh
 
 #include "G4AutoLock.hh"
 #include "globals.hh"
 
 #include "pwdefs.hh"
 #include <stdlib.h>
 
 class G4ProcessManager;
 class G4VTrackingManager;
 
 class G4PDefData
 {
     // G4PDefData is the private data from the object to be split.
     // Encapsulates the fields of the class G4ParticleDefinition
     // that may not be read-only.
 
   public:
     void initialize();
 
     G4ProcessManager* theProcessManager = nullptr;
     G4VTrackingManager* theTrackingManager = nullptr;
 };
 
 class G4PDefManager
 {
   public:
     G4PDefManager();
 
     // Invoked by the master or work thread to create a new subinstance
     // whenever a new split class instance is created. For each worker
     // thread, ions are created dynamically.
     G4int CreateSubInstance();
 
     // Invoked by each worker thread to grow the subinstance array and
     // initialize each new subinstance using a particular method defined
     // by the subclass.
     void NewSubInstances();
 
     // Invoked by all threads to free the subinstance array.
     void FreeSlave();
 
     G4PDefData* GetOffset();
 
     void UseWorkArea(G4PDefData* newOffset);
 
     G4PDefData* FreeWorkArea();
 
     G4PART_DLL static G4int& slavetotalspace();  // thread-local
     G4PART_DLL static G4PDefData*& offset();  // thread-local
 
   private:
     G4int totalobj{0};
     G4Mutex mutex;
 };
 
 #endif

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