message: Use atomicAdd instead of ++...
diff: @@ -292,7 +292,7 @@ int ElementRestriction::FillI(SparseMatrix &mat) const
  const int j_nbElts = j_nextOffset - j_offset;
  if (i_nbElts == 1 || j_nbElts == 1) // no assembly required
  {
  - I[i_L]++;
  + mfemAtomicAdd(I[i_L],1);
  }
  else // assembly required
  {
  @@ -306,7 +306,7 @@ int ElementRestriction::FillI(SparseMatrix &mat) const
  int min_e = GetMinElt(i_elts, i_nbElts, j_elts, j_nbElts);
  if (e == min_e) //Rational to add the nnz only once
  {
  - I[i_L]++;
  + mfemAtomicAdd(I[i_L],1);
  }
  }
  }
  