diff options
Diffstat (limited to 'src/H5Fmpi.c')
| -rw-r--r-- | src/H5Fmpi.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/src/H5Fmpi.c b/src/H5Fmpi.c index 78290c6..02d8d52 100644 --- a/src/H5Fmpi.c +++ b/src/H5Fmpi.c @@ -524,4 +524,68 @@ H5F_set_coll_metadata_reads(H5F_t *file, H5P_coll_md_read_flag_t *file_flag, hbo FUNC_LEAVE_NOAPI_VOID } /* end H5F_set_coll_metadata_reads() */ +/*------------------------------------------------------------------------- + * Function: H5F_mpi_get_file_block_type + * + * Purpose: Creates an MPI derived datatype for communicating an + * H5F_block_t structure. If `commit` is specified as TRUE, + * the resulting datatype will be committed and ready for + * use in communication. Otherwise, the type is only suitable + * for building other derived types. + * + * If TRUE is returned through `new_type_derived`, this lets + * the caller know that the datatype has been derived and + * should be freed with MPI_Type_free once it is no longer + * needed. + * + * Return: Non-negative on success/Negative on failure + * + *------------------------------------------------------------------------- + */ +herr_t +H5F_mpi_get_file_block_type(hbool_t commit, MPI_Datatype *new_type, hbool_t *new_type_derived) +{ + MPI_Datatype types[2]; + MPI_Aint displacements[2]; + int block_lengths[2]; + int field_count; + int mpi_code; + herr_t ret_value = SUCCEED; + + FUNC_ENTER_NOAPI(FAIL) + + HDassert(new_type); + HDassert(new_type_derived); + + *new_type_derived = FALSE; + + field_count = 2; + HDassert(field_count == sizeof(types) / sizeof(MPI_Datatype)); + + block_lengths[0] = 1; + block_lengths[1] = 1; + displacements[0] = offsetof(H5F_block_t, offset); + displacements[1] = offsetof(H5F_block_t, length); + types[0] = HADDR_AS_MPI_TYPE; + types[1] = HSIZE_AS_MPI_TYPE; + if (MPI_SUCCESS != + (mpi_code = MPI_Type_create_struct(field_count, block_lengths, displacements, types, new_type))) + HMPI_GOTO_ERROR(FAIL, "MPI_Type_create_struct failed", mpi_code) + *new_type_derived = TRUE; + + if (commit && MPI_SUCCESS != (mpi_code = MPI_Type_commit(new_type))) + HMPI_GOTO_ERROR(FAIL, "MPI_Type_commit failed", mpi_code) + +done: + if (ret_value < 0) { + if (*new_type_derived) { + if (MPI_SUCCESS != (mpi_code = MPI_Type_free(new_type))) + HMPI_DONE_ERROR(FAIL, "MPI_Type_free failed", mpi_code) + *new_type_derived = FALSE; + } + } + + FUNC_LEAVE_NOAPI(ret_value) +} /* end H5F_mpi_get_file_block_type() */ + #endif /* H5_HAVE_PARALLEL */ |