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//
// $Id: G4MPIrandomSeedGenerator.cc,v 1.1 2007/11/16 14:05:41 kmura Exp $
// $Name:  $
//
// ====================================================================
//   G4MPIrandomSeedGenerator.cc
//
//                                         2007 Q
// ====================================================================
#include "G4MPIrandomSeedGenerator.hh"
#include "G4MPImanager.hh"
#include "Randomize.hh"

// ====================================================================
//
// class description
//
// ====================================================================

////////////////////////////////////////////////////
G4MPIrandomSeedGenerator::G4MPIrandomSeedGenerator()
  : G4VMPIseedGenerator()
////////////////////////////////////////////////////
{
  GenerateSeeds();
}


/////////////////////////////////////////////////////
G4MPIrandomSeedGenerator::~G4MPIrandomSeedGenerator()
/////////////////////////////////////////////////////
{
}


///////////////////////////////////////////////////
G4bool G4MPIrandomSeedGenerator::CheckDoubleCount()
///////////////////////////////////////////////////
{
  G4MPImanager* g4MPI= G4MPImanager::GetManager();
  G4int nsize= g4MPI-> GetSize();

  for (G4int i=0; i< nsize; i++) {
    for (G4int j=0; j< nsize; j++) {
      if((i != j) && (seedList[i] == seedList[j])) {
        G4double x= G4UniformRand();
        seedList[j]= G4long(x*LONG_MAX);
        return false;
      }
    }
  }

  return true;
}


//////////////////////////////////////////////
void G4MPIrandomSeedGenerator::GenerateSeeds()
//////////////////////////////////////////////
{
  G4MPImanager* g4MPI= G4MPImanager::GetManager();
  G4int nsize= g4MPI-> GetSize();
  seedList.clear();

  for (G4int i=0; i< nsize; i++) {
    G4double x= G4UniformRand();
    G4int seed= G4long(x*LONG_MAX);
    seedList.push_back(seed);
  }

  while(! CheckDoubleCount()) {
    continue;
  }
}