dbcsr_get_local_cols Subroutine

   SUBROUTINE dbcsr_get_local_cols(dist, local_cols, local_pcol)
      !! Determines mapping from local to global columns

      TYPE(dbcsr_distribution_obj), INTENT(INOUT)        :: dist
         !! mapping for this distribution
      TYPE(array_i1d_obj), INTENT(OUT)                   :: local_cols
         !! local elements for specified column
      INTEGER, INTENT(IN)                                :: local_pcol
         !! find local elements for this local column

      CHARACTER(len=*), PARAMETER :: routineN = 'dbcsr_get_local_cols'

      INTEGER                                            :: el, error_handle, npcols, pcol
      INTEGER, ALLOCATABLE, DIMENSION(:)                 :: nle
      INTEGER, DIMENSION(:), POINTER                     :: col_dist, itmp

      CALL timeset(routineN, error_handle)
      ! If the current local col mappings do not exist, create them.
      IF (.NOT. dist%d%has_other_l_cols) THEN
         dist%d%has_other_l_cols = .TRUE.
         npcols = dbcsr_mp_npcols(dbcsr_distribution_mp(dist))
         ALLOCATE (dist%d%other_l_cols(0:dbcsr_mp_npcols(dist%d%mp_env) - 1))
         ALLOCATE (nle(0:npcols - 1))
         col_dist => dbcsr_distribution_col_dist(dist)
         ! Count the number of local elements per col.
         nle(:) = 0
         DO el = 1, SIZE(col_dist)
            pcol = col_dist(el)
            nle(pcol) = nle(pcol) + 1
         END DO
         DO pcol = 0, npcols - 1
            ALLOCATE (itmp(nle(pcol)))
            itmp = 0
            CALL array_new(dist%d%other_l_cols(pcol), &
                           itmp, lb=1)
            DEALLOCATE (itmp)
         END DO
         DEALLOCATE (nle)
         CALL find_all_local_elements(dist%d%other_l_cols, col_dist, npcols)
      ELSE
         IF (careful_mod .AND. .NOT. ASSOCIATED(dist%d%other_l_cols)) &
            DBCSR_ABORT("Local columns mapping does not exist.")
      END IF
      local_cols = dist%d%other_l_cols(local_pcol)
      CALL timestop(error_handle)
   END SUBROUTINE dbcsr_get_local_cols