G4PDefManager.cc

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//
// $Id: G4PDefManager.cc 110257 2018-05-17 14:20:12Z gcosmo $
//
//
// ------------------------------------------------------------
//
//  GEANT4 class header file
//
// ---------------- G4PDefManager ----------------
//
// Utility template class for splitting RW data for thread-safety from
// classes: G4ParticleDefinition, G4VDecayChannel.
//
// ------------------------------------------------------------
// History:
// 01.25.2009 Xin Dong: First implementation from automatic MT conversion.
// ------------------------------------------------------------

#include <stdlib.h>

#include "G4PDefManager.hh"
#include "globals.hh"
#include "pwdefs.hh"
#include "G4AutoLock.hh"

void G4PDefData::initialize()
{
  theProcessManager = 0;
}

G4int& G4PDefManager::slavetotalspace()
{
    G4ThreadLocalStatic G4int _instance = 0;
    return _instance;
}

G4PDefData*& G4PDefManager::offset()
{
    G4ThreadLocalStatic G4PDefData* _instance = nullptr;
    return _instance;
}

G4PDefManager::G4PDefManager() : totalobj(0)
{
  G4MUTEXINIT(mutex);
}

G4int G4PDefManager::CreateSubInstance()
  // 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.
{
  G4AutoLock l(&mutex);
  totalobj++;
  if (totalobj > slavetotalspace())
  {
    l.unlock();
    NewSubInstances();
    l.lock();
  }
  return (totalobj - 1);
}

void G4PDefManager::NewSubInstances()
  // Invoked by each worker thread to grow the subinstance array and
  // initialize each new subinstance using a particular method defined
  // by the subclass.
{
  G4AutoLock l(&mutex);
  if (slavetotalspace()  >= totalobj)  { return; }
  G4int originaltotalspace = slavetotalspace();
  slavetotalspace() = totalobj + 512;
  offset() = (G4PDefData *) realloc(offset(), slavetotalspace() * sizeof(G4PDefData));

  if (offset() == 0)
  {
    G4Exception("G4PDefManager::NewSubInstances()",
                "OutOfMemory", FatalException, "Cannot malloc space!");
  }

  for (G4int i = originaltotalspace; i < slavetotalspace(); i++)
  {
    offset()[i].initialize();
  }
}

void G4PDefManager::FreeSlave()
  // Invoked by all threads to free the subinstance array.
{
  if (!offset())  { return; }
  free(offset());
  offset() = 0;
}

G4PDefData* G4PDefManager::GetOffset()
{
  return offset();
}

void G4PDefManager::UseWorkArea( G4PDefData* newOffset )
  // Use recycled work area, which was created previously.
{
  if( offset() && offset()!=newOffset )
  {
    G4Exception("G4PDefManager::UseWorkspace()",
                "InvalidCondition", FatalException,
                "Thread already has workspace - cannot use another.");
  }
  offset()= newOffset;
}

G4PDefData* G4PDefManager::FreeWorkArea()
  // Detach this thread from this Location
  // The object which calls this method is responsible for it.
{
  G4PDefData* offsetRet= offset();
  offset()= 0;
  return offsetRet;
}