G4MPIrandomSeedGenerator.cc

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#include "G4MPIrandomSeedGenerator.hh"
#include "G4MPImanager.hh"
#include "Randomize.hh"

// --------------------------------------------------------------------------
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;
  }
}