Name: H5Pget_link_phase_change
Signature:
  herr_t `H5Pget_link_phase_change`( hid_t `gcpl_id`, unsigned *`max_compact`, unsigned *`min_dense` )

Purpose:
  Queries the settings for conversion between compact and dense groups.

Description:
  `H5Pget_link_phase_change` queries the maximum number of entries for a compact group and the minimum number links to require before converting a group to a dense form.

  In the compact format, links are stored as messages in the group’s header. In the dense format, links are stored in a fractal heap and indexed with a version 2 B-tree.

  `max_compact` is the maximum number of links to store as header messages in the group header before converting the group to the dense format. Groups that are in the compact format and exceed this number of links are automatically converted to the dense format.

  `min_dense` is the minimum number of links to store in the dense format. Groups which are in dense format and in which the number of links falls below this number are automatically converted back to the compact format.

  In the compact format, links are stored as messages in the group’s header. In the dense format, links are stored in a fractal heap and indexed with a version 2 B-tree.

  See `H5Pset_link_phase_change` for a discussion of traditional, compact, and dense group storage.

Parameters:

  hid_t `gcpl_id` | IN: Group creation property list identifier
  unsigned *`max_compact` | OUT: Maximum number of links for compact storage
  unsigned *`min_dense` | OUT: Minimum number of links for dense storage

Returns:
  Returns a non-negative value if successful; otherwise returns a negative value.

Fortran90 Interface: h5pset_link_phase_change

      SUBROUTINE h5pset_link_phase_change_f(gcpl_id, max_compact, min_dense, hdferr)
        IMPLICIT NONE
        INTEGER(HID_T), INTENT(IN) :: gcpl_id
                                        ! Group creation property list identifier
        INTEGER, INTENT(IN) :: max_compact
                                        ! Maximum number of attributes to be stored
                                        ! in compact storage
        INTEGER, INTENT(IN) :: min_dense
                                        ! Minimum number of attributes to be stored
                                        ! in dense storage
        INTEGER, INTENT(OUT) :: hdferr  ! Error code
                                        ! 0 on success and -1 on failure
      END SUBROUTINE h5pset_link_phase_change_f

History:

  Release | C
  1.8.0 | Function introduced in this release.