tk.git - Tk is a free and open-source, cross-platform widget toolkit that provides a library of basic elements of GUI widgets for building a graphical user interface (GUI) in many programming languages.

Tk is a free and open-source, cross-platform widget toolkit that provides a library of basic elements of GUI widgets for building a graphical user interface (GUI) in many programming languages.
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author	dkf <donal.k.fellows@manchester.ac.uk>	2012-08-27 17:47:58 (GMT)
committer	dkf <donal.k.fellows@manchester.ac.uk>	2012-08-27 17:47:58 (GMT)
commit	bd27ced6025b5ce285080806ecd44c8b9bc1786a (patch)
tree	0d93a7825c9a4a4c08c720eab194f8b7788a2f10 /library/comdlg.tcl
parent	e4c7ef5bdf6375e1860418b1ec92c07f88660cc8 (diff)
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Remove accidental commit of merge conflict, resolved to original code.
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 * Programmer:  rky 980813
 *
 * Purpose:	Create MPI data types for HDF5 selections.
 *
 */

/****************/
/* Module Setup */
/****************/

#include "H5Smodule.h"          /* This source code file is part of the H5S module */


/***********/
/* Headers */
/***********/
#include "H5private.h"		/* Generic Functions			*/
#include "H5Dprivate.h"		/* Datasets				*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5FLprivate.h"	/* Free Lists				*/
#include "H5MMprivate.h"        /* Memory management                    */
#include "H5Spkg.h"		/* Dataspaces 				*/
#include "H5VMprivate.h"        /* Vector and array functions		*/

#ifdef H5_HAVE_PARALLEL

/****************/
/* Local Macros */
/****************/
#define H5S_MPIO_INITIAL_ALLOC_COUNT    256

/*******************/
/* Local Variables */
/*******************/

/******************/
/* Local Typedefs */
/******************/

/* Node in linked list of MPI data types created during traversal of irregular hyperslab selection */
typedef struct H5S_mpio_mpitype_node_t {
    MPI_Datatype type;                          /* MPI Datatype */
    struct H5S_mpio_mpitype_node_t *next;       /* Pointer to next node in list */
} H5S_mpio_mpitype_node_t;

/* List to track MPI data types generated during traversal of irregular hyperslab selection */
typedef struct H5S_mpio_mpitype_list_t {
    H5S_mpio_mpitype_node_t *head;      /* Pointer to head of list */
    H5S_mpio_mpitype_node_t *tail;      /* Pointer to tail of list */
} H5S_mpio_mpitype_list_t;


/********************/
/* Local Prototypes */
/********************/
static herr_t H5S__mpio_all_type(const H5S_t *space, size_t elmt_size,
    MPI_Datatype *new_type, int *count, hbool_t *is_derived_type);
static herr_t H5S__mpio_none_type(MPI_Datatype *new_type, int *count,
    hbool_t *is_derived_type);
static herr_t H5S__mpio_create_point_datatype(size_t elmt_size, hsize_t num_points,
    MPI_Aint *disp, MPI_Datatype *new_type);
static herr_t H5S__mpio_point_type(const H5S_t *space, size_t elmt_size,
    MPI_Datatype *new_type, int *count, hbool_t *is_derived_type,
    hbool_t do_permute, hsize_t **permute_map, hbool_t *is_permuted);
static herr_t H5S__mpio_permute_type(const H5S_t *space, size_t elmt_size,
    hsize_t **permute_map, MPI_Datatype *new_type, int *count,
    hbool_t *is_derived_type);
static herr_t H5S__mpio_reg_hyper_type(const H5S_t *space, size_t elmt_size,
    MPI_Datatype *new_type, int *count, hbool_t *is_derived_type);
static herr_t H5S__mpio_span_hyper_type(const H5S_t *space, size_t elmt_size,
    MPI_Datatype *new_type, int *count, hbool_t *is_derived_type);
static herr_t H5S__release_datatype(H5S_mpio_mpitype_list_t *type_list);
static herr_t H5S__obtain_datatype(H5S_hyper_span_info_t *spans, const hsize_t *down,
    size_t elmt_size, const MPI_Datatype *elmt_type, MPI_Datatype *span_type,
    H5S_mpio_mpitype_list_t *type_list, uint64_t op_gen);


/*****************************/
/* Library Private Variables */
/*****************************/


/*********************/
/* Package Variables */
/*********************/


/* Declare a free list to manage the H5S_mpio_mpitype_node_t struct */
H5FL_DEFINE_STATIC(H5S_mpio_mpitype_node_t);


/*-------------------------------------------------------------------------
 * Function:	H5S__mpio_all_type
 *
 * Purpose:	Translate an HDF5 "all" selection into an MPI type.
 *
 * Return:	Non-negative on success, negative on failure.
 *
 * Outputs:	*new_type	  the MPI type corresponding to the selection
 *		*count		  how many objects of the new_type in selection
 *				  (useful if this is the buffer type for xfer)
 *		*is_derived_type  0 if MPI primitive type, 1 if derived
 *
 * Programmer:	rky 980813
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5S__mpio_all_type(const H5S_t *space, size_t elmt_size,
    MPI_Datatype *new_type, int *count, hbool_t *is_derived_type)
{
    hsize_t	total_bytes;
    hssize_t	snelmts;                /* Total number of elmts	(signed) */
    hsize_t	nelmts;                 /* Total number of elmts	*/
    hsize_t     bigio_count;            /* Transition point to create derived type */
    herr_t	ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_STATIC

    /* Check args */
    HDassert(space);

    /* Just treat the entire extent as a block of bytes */
    if((snelmts = (hssize_t)H5S_GET_EXTENT_NPOINTS(space)) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "src dataspace has invalid selection")
    H5_CHECKED_ASSIGN(nelmts, hsize_t, snelmts, hssize_t);

    total_bytes = (hsize_t)elmt_size * nelmts;
    bigio_count = H5_mpi_get_bigio_count();

    /* Verify that the size can be expressed as a 32 bit integer */
    if(bigio_count >= total_bytes) {
        /* fill in the return values */
        *new_type = MPI_BYTE;
        H5_CHECKED_ASSIGN(*count, int, total_bytes, hsize_t);
        *is_derived_type = FALSE;
    } /* end if */
    else {
        /* Create a LARGE derived datatype for this transfer */
        if(H5_mpio_create_large_type(total_bytes, 0, MPI_BYTE, new_type) < 0)
            HGOTO_ERROR(H5E_DATASPACE, H5E_BADTYPE, FAIL, "couldn't create a large datatype from the all selection")
        *count = 1;
        *is_derived_type = TRUE;
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5S__mpio_all_type() */


/*-------------------------------------------------------------------------
 * Function:	H5S__mpio_none_type
 *
 * Purpose:	Translate an HDF5 "none" selection into an MPI type.
 *
 * Return:	Non-negative on success, negative on failure.
 *
 * Outputs:	*new_type	  the MPI type corresponding to the selection
 *		*count		  how many objects of the new_type in selection
 *				  (useful if this is the buffer type for xfer)
 *		*is_derived_type  0 if MPI primitive type, 1 if derived
 *
 * Programmer:	Quincey Koziol, October 29, 2002
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5S__mpio_none_type(MPI_Datatype *new_type, int *count, hbool_t *is_derived_type)
{
    FUNC_ENTER_STATIC_NOERR

    /* fill in the return values */
    *new_type = MPI_BYTE;
    *count = 0;
    *is_derived_type = FALSE;

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* H5S__mpio_none_type() */


/*-------------------------------------------------------------------------
 * Function:	H5S__mpio_create_point_datatype
 *
 * Purpose:	Create a derived datatype for point selections.
 *
 * Return:	Non-negative on success, negative on failure.
 *
 * Outputs:	*new_type	  the MPI type corresponding to the selection
 *
 * Programmer:	Mohamad Chaarawi
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5S__mpio_create_point_datatype(size_t elmt_size, hsize_t num_points,
    MPI_Aint *disp, MPI_Datatype *new_type)
{
    MPI_Datatype   elmt_type;           /* MPI datatype for individual element */
    hbool_t        elmt_type_created = FALSE;   /* Whether the element MPI datatype was created */
    int            *inner_blocks = NULL;        /* Arrays for MPI datatypes when "large" datatype needed */
    MPI_Aint       *inner_disps = NULL;
    MPI_Datatype   *inner_types = NULL;
#if MPI_VERSION < 3
    int            *blocks = NULL;      /* Array of block sizes for MPI hindexed create call */
    hsize_t        u;                   /* Local index variable */
#endif
    hsize_t        bigio_count;         /* Transition point to create derived type */
    int            mpi_code;            /* MPI error code */
    herr_t	   ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_STATIC

    /* Create an MPI datatype for an element */
    if(MPI_SUCCESS != (mpi_code = MPI_Type_contiguous((int)elmt_size, MPI_BYTE, &elmt_type)))
        HMPI_GOTO_ERROR(FAIL, "MPI_Type_contiguous failed", mpi_code)
    elmt_type_created = TRUE;

    bigio_count = H5_mpi_get_bigio_count();

    /* Check whether standard or BIGIO processing will be employeed */
    if(bigio_count >= num_points) {
#if MPI_VERSION >= 3
        /* Create an MPI datatype for the whole point selection */
        if(MPI_SUCCESS != (mpi_code = MPI_Type_create_hindexed_block((int)num_points, 1, disp, elmt_type, new_type)))
            HMPI_GOTO_ERROR(FAIL, "MPI_Type_create_indexed_block failed", mpi_code)
#else
        /* Allocate block sizes for MPI datatype call */
        if(NULL == (blocks = (int *)H5MM_malloc(sizeof(int) * num_points)))
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate array of blocks")

        for(u = 0; u < num_points; u++)
            blocks[u] = 1;

        /* Create an MPI datatype for the whole point selection */
        if(MPI_SUCCESS != (mpi_code = MPI_Type_create_hindexed((int)num_points, blocks, disp, elmt_type, new_type)))
            HMPI_GOTO_ERROR(FAIL, "MPI_Type_create_hindexed failed", mpi_code)
#endif

        /* Commit MPI datatype for later use */
        if(MPI_SUCCESS != (mpi_code = MPI_Type_commit(new_type)))
            HMPI_GOTO_ERROR(FAIL, "MPI_Type_commit failed", mpi_code)
    } /* end if */
    else {
        /* use LARGE_DATATYPE::
         * We'll create an hindexed_block type for every 2G point count and then combine
         * those and any remaining points into a single large datatype.
         */
        int total_types, i;
        int remaining_points;
        int num_big_types;
        hsize_t leftover;

        /* Calculate how many Big MPI datatypes are needed to represent the buffer */
        num_big_types = (int)(num_points / bigio_count);

        leftover = (hsize_t)num_points - (hsize_t)num_big_types * (hsize_t)bigio_count;
        H5_CHECKED_ASSIGN(remaining_points, int, leftover, hsize_t);

        total_types = (int)(remaining_points) ? (num_big_types + 1) : num_big_types;

        /* Allocate array if MPI derived types needed */
        if(NULL == (inner_types = (MPI_Datatype *)H5MM_malloc((sizeof(MPI_Datatype) * (size_t)total_types))))
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate array of blocks")

        if(NULL == (inner_blocks = (int *)H5MM_malloc(sizeof(int) * (size_t)total_types)))
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate array of blocks")

        if(NULL == (inner_disps = (MPI_Aint *)H5MM_malloc(sizeof(MPI_Aint) * (size_t)total_types)))
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate array of blocks")

#if MPI_VERSION < 3
        /* Allocate block sizes for MPI datatype call */
        if(NULL == (blocks = (int *)H5MM_malloc(sizeof(int) * bigio_count)))
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate array of blocks")

        for(u = 0; u < bigio_count; u++)
            blocks[u] = 1;
#endif

        for(i = 0; i < num_big_types; i++) {
#if MPI_VERSION >= 3
            if(MPI_SUCCESS != (mpi_code = MPI_Type_create_hindexed_block(bigio_count,
                    1, &disp[i*bigio_count], elmt_type, &inner_types[i])))
                HMPI_GOTO_ERROR(FAIL, "MPI_Type_create_hindexed_block failed", mpi_code)
#else
            if(MPI_SUCCESS != (mpi_code = MPI_Type_create_hindexed((int)bigio_count,
                    blocks, &disp[i*bigio_count], elmt_type, &inner_types[i])))
                HMPI_GOTO_ERROR(FAIL, "MPI_Type_create_hindexed failed", mpi_code)
#endif
            inner_blocks[i] = 1;
            inner_disps[i]  = 0;
        } /* end for*/

        if(remaining_points) {
#if MPI_VERSION >= 3
            if(MPI_SUCCESS != (mpi_code = MPI_Type_create_hindexed_block(remaining_points,
                    1, &disp[num_big_types*bigio_count], elmt_type, &inner_types[num_big_types])))
                HMPI_GOTO_ERROR(FAIL, "MPI_Type_create_hindexed_block failed", mpi_code)
#else
            if(MPI_SUCCESS != (mpi_code = MPI_Type_create_hindexed((int)remaining_points,
                    blocks, &disp[num_big_types*bigio_count], elmt_type, &inner_types[num_big_types])))
                HMPI_GOTO_ERROR(FAIL, "MPI_Type_create_hindexed failed", mpi_code)
#endif
            inner_blocks[num_big_types] = 1;
            inner_disps[num_big_types] = 0;
        } /* end if */

        if(MPI_SUCCESS != (mpi_code = MPI_Type_create_struct(total_types,
                inner_blocks, inner_disps, inner_types, new_type)))
            HMPI_GOTO_ERROR(FAIL, "MPI_Type_create_struct", mpi_code)
        for(i = 0; i < total_types; i++)
            MPI_Type_free(&inner_types[i]);

        /* Commit MPI datatype for later use */
        if(MPI_SUCCESS != (mpi_code = MPI_Type_commit(new_type)))
            HMPI_GOTO_ERROR(FAIL, "MPI_Type_commit failed", mpi_code)
    } /* end else */

done:
    if(elmt_type_created)
        MPI_Type_free(&elmt_type);
#if MPI_VERSION < 3
    if(blocks)
        H5MM_free(blocks);
#endif
    if(inner_types)
        H5MM_free(inner_types);
    if(inner_blocks)
        H5MM_free(inner_blocks);
    if(inner_disps)
        H5MM_free(inner_disps);

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5S__mpio_create_point_datatype() */


/*-------------------------------------------------------------------------
 * Function:	H5S__mpio_point_type
 *
 * Purpose:	Translate an HDF5 "point" selection into an MPI type.
 *              Create a permutation array to handle out-of-order point selections.
 *
 * Return:	Non-negative on success, negative on failure.
 *
 * Outputs:	*new_type	  the MPI type corresponding to the selection
 *		*count		  how many objects of the new_type in selection
 *				  (useful if this is the buffer type for xfer)
 *		*is_derived_type  0 if MPI primitive type, 1 if derived
 *              *permute_map      the permutation of the displacements to create
 *                                the MPI_Datatype
 *              *is_permuted      0 if the displacements are permuted, 1 if not
 *
 * Programmer:	Mohamad Chaarawi
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5S__mpio_point_type(const H5S_t *space, size_t elmt_size, MPI_Datatype *new_type,
    int *count, hbool_t *is_derived_type, hbool_t do_permute, hsize_t **permute,
    hbool_t *is_permuted)
{
    MPI_Aint *disp = NULL;      /* Datatype displacement for each point*/
    H5S_pnt_node_t *curr = NULL; /* Current point being operated on in from the selection */
    hssize_t snum_points;       /* Signed number of elements in selection */
    hsize_t num_points;         /* Sumber of points in the selection */
    hsize_t u;                  /* Local index variable */
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_STATIC

    /* Check args */
    HDassert(space);

    /* Get the total number of points selected */
    if((snum_points = (hssize_t)H5S_GET_SELECT_NPOINTS(space)) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOUNT, FAIL, "can't get number of elements selected")
    num_points = (hsize_t)snum_points;

    /* Allocate array for element displacements */
    if(NULL == (disp = (MPI_Aint *)H5MM_malloc(sizeof(MPI_Aint) * num_points)))
         HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate array of displacements")

    /* Allocate array for element permutation - returned to caller */
    if(do_permute)
        if(NULL == (*permute = (hsize_t *)H5MM_malloc(sizeof(hsize_t) * num_points)))
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate permutation array")

    /* Iterate through list of elements */
    curr = space->select.sel_info.pnt_lst->head;
    for(u = 0 ; u < num_points ; u++) {
        /* Calculate the displacement of the current point */
        disp[u] = H5VM_array_offset(space->extent.rank, space->extent.size, curr->pnt);
        disp[u] *= elmt_size;

        /* This is a File Space used to set the file view, so adjust the displacements
         * to have them monotonically non-decreasing.
         * Generate the permutation array by indicating at each point being selected,
         * the position it will shifted in the new displacement. Example:
         * Suppose 4 points with corresponding are selected
         * Pt 1: disp=6 ; Pt 2: disp=3 ; Pt 3: disp=0 ; Pt 4: disp=4
         * The permute map to sort the displacements in order will be:
         * point 1: map[0] = L, indicating that this point is not moved (1st point selected)
         * point 2: map[1] = 0, indicating that this point is moved to the first position,
         *                      since disp_pt1(6) > disp_pt2(3)
         * point 3: map[2] = 0, move to position 0, bec it has the lowest disp between
         *                      the points selected so far.
         * point 4: map[3] = 2, move the 2nd position since point 1 has a higher disp,
         *                      but points 2 and 3 have lower displacements.
         */
        if(do_permute) {
            if(u > 0 && disp[u] < disp[u - 1]) {
                unsigned s = 0, l = u, m = u / 2;

                *is_permuted = TRUE;
                do {
                    if(disp[u] > disp[m])
                        s = m + 1;
                    else if(disp[u] < disp[m])
                        l = m;
                    else
                        break;
                    m = s + ((l - s) / 2);
                } while(s < l);

                if(m < u) {
                    MPI_Aint temp;

                    temp = disp[u];
                    HDmemmove(disp + m + 1, disp + m, (u - m) * sizeof(MPI_Aint));
                    disp[m] = temp;
                } /* end if */
                (*permute)[u] = m;
            } /* end if */
            else
                (*permute)[u] = num_points;
        } /* end if */
        /* this is a memory space, and no permutation is necessary to create
           the derived datatype */
        else {
            ;   /* do nothing */
        } /* end else */

        /* get the next point */
        curr = curr->next;
    } /* end for */

    /* Create the MPI datatype for the set of element displacements */
    if(H5S__mpio_create_point_datatype(elmt_size, num_points, disp, new_type) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_BADTYPE, FAIL, "couldn't create an MPI Datatype from point selection")

    /* Set values about MPI datatype created */
    *count = 1;
    *is_derived_type = TRUE;

done:
    if(NULL != disp)
        H5MM_free(disp);

    /* Release the permutation buffer, if it wasn't used */
    if(!(*is_permuted) && (*permute)) {
        H5MM_free(*permute);
        *permute = NULL;
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5S__mpio_point_type() */


/*-------------------------------------------------------------------------
 * Function:	H5S__mpio_permute_type
 *
 * Purpose:	Translate an HDF5 "all/hyper/point" selection into an MPI type,
 *              while applying the permutation map. This function is called if
 *              the file space selection is permuted due to out-of-order point
 *              selection and so the memory datatype has to be permuted using the
 *              permutation map created by the file selection.
 *
 * Note:	This routine is called from H5_mpio_space_type(), which is
 *              called first for the file dataspace and creates
 *
 * Return:	Non-negative on success, negative on failure.
 *
 * Outputs:	*new_type	  the MPI type corresponding to the selection
 *		*count		  how many objects of the new_type in selection
 *				  (useful if this is the buffer type for xfer)
 *		*is_derived_type  0 if MPI primitive type, 1 if derived
 *
 * Programmer:	Mohamad Chaarawi
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5S__mpio_permute_type(const H5S_t *space, size_t elmt_size, hsize_t **permute,
    MPI_Datatype *new_type, int *count, hbool_t *is_derived_type)
{
    MPI_Aint *disp = NULL;      /* Datatype displacement for each point*/
    H5S_sel_iter_t sel_iter;    /* Selection iteration info */
    hbool_t sel_iter_init = FALSE;      /* Selection iteration info has been initialized */
    hssize_t snum_points;       /* Signed number of elements in selection */
    hsize_t num_points;         /* Number of points in the selection */
    size_t max_elem;            /* Maximum number of elements allowed in sequences */
    hsize_t u;                  /* Local index variable */
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_STATIC

    /* Check args */
    HDassert(space);

    /* Get the total number of points selected */
    if((snum_points = (hssize_t)H5S_GET_SELECT_NPOINTS(space)) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCOUNT, FAIL, "can't get number of elements selected")
    num_points = (hsize_t)snum_points;

    /* Allocate array to store point displacements */
    if(NULL == (disp = (MPI_Aint *)H5MM_malloc(sizeof(MPI_Aint) * num_points)))
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate array of displacements")

    /* Initialize selection iterator */
    if(H5S_select_iter_init(&sel_iter, space, elmt_size, 0) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINIT, FAIL, "unable to initialize selection iterator")
    sel_iter_init = TRUE;	/* Selection iteration info has been initialized */

    /* Set the number of elements to iterate over */
    H5_CHECKED_ASSIGN(max_elem, size_t, num_points, hsize_t);

    /* Loop, while elements left in selection */
    u = 0;
    while(max_elem > 0) {
        hsize_t off[H5D_IO_VECTOR_SIZE];        /* Array to store sequence offsets */
        size_t len[H5D_IO_VECTOR_SIZE];         /* Array to store sequence lengths */
        size_t nelem;               /* Number of elements used in sequences */
        size_t nseq;                /* Number of sequences generated */
        size_t curr_seq;            /* Current sequence being worked on */

        /* Get the sequences of bytes */
        if(H5S_SELECT_ITER_GET_SEQ_LIST(&sel_iter, (size_t)H5D_IO_VECTOR_SIZE, max_elem, &nseq, &nelem, off, len) < 0)
            HGOTO_ERROR(H5E_DATASPACE, H5E_UNSUPPORTED, FAIL, "sequence length generation failed")

        /* Loop, while sequences left to process */
        for(curr_seq = 0; curr_seq < nseq; curr_seq++) {
            hsize_t curr_off;           /* Current offset within sequence */
            size_t curr_len;            /* Length of bytes left to process in sequence */

            /* Get the current offset */
            curr_off = off[curr_seq];

            /* Get the number of bytes in sequence */
            curr_len = len[curr_seq];

            /* Loop, while bytes left in sequence */
            while(curr_len > 0) {
                /* Set the displacement of the current point */
                disp[u] = curr_off;

                /* This is a memory displacement, so for each point selected,
                 * apply the map that was generated by the file selection */
                if((*permute)[u] != num_points) {
                    MPI_Aint temp = disp[u];

                    HDmemmove(disp + (*permute)[u] + 1, disp + (*permute)[u],
                             (u - (*permute)[u]) * sizeof(MPI_Aint));
                    disp[(*permute)[u]] = temp;
                } /* end if */

                /* Advance to next element */
                u++;

                /* Increment offset in dataspace */
                curr_off += elmt_size;

                /* Decrement number of bytes left in sequence */
                curr_len -= elmt_size;
            } /* end while */
        } /* end for */

        /* Decrement number of elements left to process */
        max_elem -= nelem;
    } /* end while */

    /* Create the MPI datatype for the set of element displacements */
    if(H5S__mpio_create_point_datatype(elmt_size, num_points, disp, new_type) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_BADTYPE, FAIL, "couldn't create an MPI Datatype from point selection")

    /* Set values about MPI datatype created */
    *count = 1;
    *is_derived_type = TRUE;

done:
    /* Release selection iterator */
    if(sel_iter_init)
        if(H5S_SELECT_ITER_RELEASE(&sel_iter) < 0)
            HDONE_ERROR(H5E_DATASPACE, H5E_CANTRELEASE, FAIL, "unable to release selection iterator")

    /* Free memory */
    if(disp)
        H5MM_free(disp);
    if(*permute) {
        H5MM_free(*permute);
        *permute = NULL;
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5S__mpio_permute_type() */


/*-------------------------------------------------------------------------
 * Function:	H5S__mpio_reg_hyper_type
 *
 * Purpose:	Translate a regular HDF5 hyperslab selection into an MPI type.
 *
 * Return:	Non-negative on success, negative on failure.
 *
 * Outputs:	*new_type	  the MPI type corresponding to the selection
 *		*count		  how many objects of the new_type in selection
 *				  (useful if this is the buffer type for xfer)
 *		*is_derived_type  0 if MPI primitive type, 1 if derived
 *
 * Programmer:	rky 980813
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5S__mpio_reg_hyper_type(const H5S_t *space, size_t elmt_size,
    MPI_Datatype *new_type, int *count, hbool_t *is_derived_type)
{
    H5S_sel_iter_t sel_iter;    /* Selection iteration info */
    hbool_t sel_iter_init = FALSE;    /* Selection iteration info has been initialized */

    struct dim {	/* less hassle than malloc/free & ilk */
        hssize_t start;
        hsize_t strid;
        hsize_t block;
        hsize_t xtent;
        hsize_t count;
    } d[H5S_MAX_RANK];

    hsize_t             bigio_count;            /* Transition point to create derived type */
    hsize_t		offset[H5S_MAX_RANK];
    hsize_t		max_xtent[H5S_MAX_RANK];
    H5S_hyper_dim_t	*diminfo;		/* [rank] */
    unsigned		rank;
    MPI_Datatype	inner_type, outer_type;
    MPI_Aint            extent_len, start_disp, new_extent;
    MPI_Aint            lb; /* Needed as an argument for MPI_Type_get_extent */
    unsigned		u;			/* Local index variable */
    int			i;			/* Local index variable */
    int                 mpi_code;               /* MPI return code */
    herr_t		ret_value = SUCCEED;

    FUNC_ENTER_STATIC

    /* Check args */
    HDassert(space);
    HDassert(sizeof(MPI_Aint) >= sizeof(elmt_size));

    bigio_count = H5_mpi_get_bigio_count();
    /* Initialize selection iterator */
    if(H5S_select_iter_init(&sel_iter, space, elmt_size, 0) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTINIT, FAIL, "unable to initialize selection iterator")
    sel_iter_init = TRUE;	/* Selection iteration info has been initialized */

    /* Abbreviate args */
    diminfo = sel_iter.u.hyp.diminfo;
    HDassert(diminfo);

    /* Make a local copy of the dimension info so we can operate with them */

    /* Check if this is a "flattened" regular hyperslab selection */
    if(sel_iter.u.hyp.iter_rank != 0 && sel_iter.u.hyp.iter_rank < space->extent.rank) {
        /* Flattened selection */
        rank = sel_iter.u.hyp.iter_rank;
#ifdef H5S_DEBUG
if(H5DEBUG(S))
    HDfprintf(H5DEBUG(S), "%s: Flattened selection\n",FUNC);
#endif
        for(u = 0; u < rank; ++u) {
            H5_CHECK_OVERFLOW(diminfo[u].start, hsize_t, hssize_t)
            d[u].start = (hssize_t)diminfo[u].start + sel_iter.u.hyp.sel_off[u];
            d[u].strid = diminfo[u].stride;
            d[u].block = diminfo[u].block;
            d[u].count = diminfo[u].count;
            d[u].xtent = sel_iter.u.hyp.size[u];

#ifdef H5S_DEBUG
if(H5DEBUG(S)) {
    HDfprintf(H5DEBUG(S), "%s: start=%Hd  stride=%Hu  count=%Hu  block=%Hu  xtent=%Hu",
        FUNC, d[u].start, d[u].strid, d[u].count, d[u].block, d[u].xtent);
    if(u == 0)
        HDfprintf(H5DEBUG(S), "  rank=%u\n", rank);
    else
        HDfprintf(H5DEBUG(S), "\n");
}
#endif

            /* Sanity check */
            HDassert(d[u].block > 0);
            HDassert(d[u].count > 0);
            HDassert(d[u].xtent > 0);
        } /* end for */
    } /* end if */
    else {
        /* Non-flattened selection */
        rank = space->extent.rank;
#ifdef H5S_DEBUG
if(H5DEBUG(S))
    HDfprintf(H5DEBUG(S),"%s: Non-flattened selection\n",FUNC);
#endif
        for(u = 0; u < rank; ++u) {
            H5_CHECK_OVERFLOW(diminfo[u].start, hsize_t, hssize_t)
            d[u].start = (hssize_t)diminfo[u].start + space->select.offset[u];
            d[u].strid = diminfo[u].stride;
            d[u].block = diminfo[u].block;
            d[u].count = diminfo[u].count;
            d[u].xtent = space->extent.size[u];

#ifdef H5S_DEBUG
if(H5DEBUG(S)) {
    HDfprintf(H5DEBUG(S), "%s: start=%Hd  stride=%Hu  count=%Hu  block=%Hu  xtent=%Hu",
              FUNC, d[u].start, d[u].strid, d[u].count, d[u].block, d[u].xtent);
    if(u == 0)
        HDfprintf(H5DEBUG(S), "  rank=%u\n", rank);
    else
        HDfprintf(H5DEBUG(S), "\n");
}
#endif

            /* Sanity check */
            HDassert(d[u].block > 0);
            HDassert(d[u].count > 0);
            HDassert(d[u].xtent > 0);
        } /* end for */
    } /* end else */

/**********************************************************************
    Compute array "offset[rank]" which gives the offsets for a multi-
    dimensional array with dimensions "d[i].xtent" (i=0,1,...,rank-1).
**********************************************************************/
    offset[rank - 1] = 1;
    max_xtent[rank - 1] = d[rank - 1].xtent;
#ifdef H5S_DEBUG
if(H5DEBUG(S)) {
    i = ((int)rank) - 1;
    HDfprintf(H5DEBUG(S), " offset[%2d]=%Hu; max_xtent[%2d]=%Hu\n", i, offset[i], i, max_xtent[i]);
}
#endif
    for(i = ((int)rank) - 2; i >= 0; --i) {
        offset[i] = offset[i + 1] * d[i + 1].xtent;
        max_xtent[i] = max_xtent[i + 1] * d[i].xtent;
#ifdef H5S_DEBUG
if(H5DEBUG(S))
    HDfprintf(H5DEBUG(S), " offset[%2d]=%Hu; max_xtent[%2d]=%Hu\n", i, offset[i], i, max_xtent[i]);
#endif
    } /* end for */

    /*  Create a type covering the selected hyperslab.
     *  Multidimensional dataspaces are stored in row-major order.
     *  The type is built from the inside out, going from the
     *  fastest-changing (i.e., inner) dimension * to the slowest (outer).
     */

/*******************************************************
*  Construct contig type for inner contig dims:
*******************************************************/
#ifdef H5S_DEBUG
if(H5DEBUG(S)) {
    HDfprintf(H5DEBUG(S), "%s: Making contig type %Zu MPI_BYTEs\n", FUNC, elmt_size);
    for(i = ((int)rank) - 1; i >= 0; --i)
        HDfprintf(H5DEBUG(S), "d[%d].xtent=%Hu \n", i, d[i].xtent);
}
#endif

    /* LARGE_DATATYPE::
     * Check if the number of elements to form the inner type fits into a 32 bit integer.
     * If yes then just create the innertype with MPI_Type_contiguous.
     * Otherwise create a compound datatype by iterating as many times as needed
     * for the innertype to be created.
     */
    if(bigio_count >= elmt_size) {
        /* Use a single MPI datatype that has a 32 bit size */
        if(MPI_SUCCESS != (mpi_code = MPI_Type_contiguous((int)elmt_size, MPI_BYTE, &inner_type)))
            HMPI_GOTO_ERROR(FAIL, "MPI_Type_contiguous failed", mpi_code)
    } /* end if */
    else
        /* Create the compound datatype for this operation (> 2GB) */
        if(H5_mpio_create_large_type(elmt_size, 0, MPI_BYTE, &inner_type) < 0)
            HGOTO_ERROR(H5E_DATASPACE, H5E_BADTYPE, FAIL, "couldn't create a large inner datatype in hyper selection")

/*******************************************************
*  Construct the type by walking the hyperslab dims
*  from the inside out:
*******************************************************/
    for(i = ((int)rank) - 1; i >= 0; --i) {
#ifdef H5S_DEBUG
if(H5DEBUG(S))
    HDfprintf(H5DEBUG(S), "%s: Dimension i=%d \n"
            "start=%Hd count=%Hu block=%Hu stride=%Hu, xtent=%Hu max_xtent=%d\n",
            FUNC, i, d[i].start, d[i].count, d[i].block, d[i].strid, d[i].xtent, max_xtent[i]);
#endif

#ifdef H5S_DEBUG
if(H5DEBUG(S))
    HDfprintf(H5DEBUG(S), "%s: i=%d  Making vector-type \n", FUNC,i);
#endif
       /****************************************
        * Build vector type of the selection.
        ****************************************/
       if(bigio_count >= d[i].count &&
                bigio_count >= d[i].block && bigio_count >= d[i].strid) {
            /* All the parameters fit into 32 bit integers so create the vector type normally */
            mpi_code = MPI_Type_vector((int)(d[i].count),       /* count */
                                       (int)(d[i].block),       /* blocklength */
                                       (int)(d[i].strid),       /* stride */
                                       inner_type,              /* old type */
                                       &outer_type);            /* new type */

            MPI_Type_free(&inner_type);
            if(mpi_code != MPI_SUCCESS)
                HMPI_GOTO_ERROR(FAIL, "couldn't create MPI vector type", mpi_code)
       } /* end if */
       else {
            /* Things get a bit more complicated and require LARGE_DATATYPE processing
             * There are two MPI datatypes that need to be created:
             *   1) an internal contiguous block; and
             *   2) a collection of elements where an element is a contiguous block(1).
             * Remember that the input arguments to the MPI-IO functions use integer
             * values to represent element counts.  We ARE allowed however, in the
             * more recent MPI implementations to use constructed datatypes whereby
             * the total number of bytes in a transfer could be :
             *   (2GB-1)number_of_blocks * the_datatype_extent.
             */

            MPI_Aint stride_in_bytes, inner_extent;
            MPI_Datatype block_type;

            /* Create a contiguous datatype inner_type x number of BLOCKS.
             * Again we need to check that the number of BLOCKS can fit into
             * a 32 bit integer */
            if(bigio_count < d[i].block) {
                if(H5_mpio_create_large_type(d[i].block, 0, inner_type, &block_type) < 0)
                    HGOTO_ERROR(H5E_DATASPACE, H5E_BADTYPE, FAIL, "couldn't create a large block datatype in hyper selection")
            } /* end if */
            else
                if(MPI_SUCCESS != (mpi_code = MPI_Type_contiguous((int)d[i].block, inner_type, &block_type)))
                    HMPI_GOTO_ERROR(FAIL, "MPI_Type_contiguous failed", mpi_code)

            /* As of version 4.0, OpenMPI now turns off MPI-1 API calls by default,
             * so we're using the MPI-2 version even though we don't need the lb
             * value.
             */
            {
                MPI_Aint unused_lb_arg;
                MPI_Type_get_extent(inner_type, &unused_lb_arg, &inner_extent);
            }
            stride_in_bytes = inner_extent * (MPI_Aint)d[i].strid;

            /* If the element count is larger than what a 32 bit integer can hold,
             * we call the large type creation function to handle that
             */
            if(bigio_count < d[i].count) {
                if(H5_mpio_create_large_type(d[i].count, stride_in_bytes, block_type, &outer_type) < 0)
                    HGOTO_ERROR(H5E_DATASPACE, H5E_BADTYPE, FAIL, "couldn't create a large outer datatype in hyper selection")
            } /* end if */
            /* otherwise a regular create_hvector will do */
            else
                if(MPI_SUCCESS != (mpi_code = MPI_Type_create_hvector((int)d[i].count, /* count */
                        1,               /* blocklength */
                        stride_in_bytes, /* stride in bytes*/
                        block_type,      /* old type */
                        &outer_type)))   /* new type */
                    HMPI_GOTO_ERROR(FAIL, "MPI_Type_create_hvector failed", mpi_code)

            MPI_Type_free(&block_type);
            MPI_Type_free(&inner_type);
       } /* end else */

        /****************************************
         *  Then build the dimension type as (start, vector type, xtent).
         ****************************************/

        /* Calculate start and extent values of this dimension */
	start_disp = d[i].start * offset[i] * elmt_size;
        new_extent = (MPI_Aint)elmt_size * max_xtent[i];
        if(MPI_SUCCESS != (mpi_code = MPI_Type_get_extent(outer_type, &lb, &extent_len)))
            HMPI_GOTO_ERROR(FAIL, "MPI_Type_get_extent failed", mpi_code)

        /*************************************************
         *  Restructure this datatype ("outer_type")
         *  so that it still starts at 0, but its extent
         *  is the full extent in this dimension.
         *************************************************/
        if(start_disp > 0 || extent_len < new_extent) {
            MPI_Datatype interm_type;
            int block_len = 1;

            HDassert(0 == lb);

            mpi_code = MPI_Type_create_hindexed(1, &block_len, &start_disp, outer_type, &interm_type);
            MPI_Type_free(&outer_type);
            if(mpi_code != MPI_SUCCESS)
                HMPI_GOTO_ERROR(FAIL, "MPI_Type_create_hindexed failed", mpi_code)

            mpi_code = MPI_Type_create_resized(interm_type, lb, new_extent, &inner_type);
            MPI_Type_free(&interm_type);
            if(mpi_code != MPI_SUCCESS)
                HMPI_GOTO_ERROR(FAIL, "couldn't resize MPI vector type", mpi_code)
        } /* end if */
        else
            inner_type = outer_type;
    } /* end for */
/******************************************
*  End of loop, walking through dimensions.
*******************************************/

    /* At this point inner_type is actually the outermost type, even for 0-trip loop */
    *new_type = inner_type;
    if(MPI_SUCCESS != (mpi_code = MPI_Type_commit(new_type)))
        HMPI_GOTO_ERROR(FAIL, "MPI_Type_commit failed", mpi_code)

    /* fill in the remaining return values */
    *count = 1;			/* only have to move one of these suckers! */
    *is_derived_type = TRUE;

done:
    /* Release selection iterator */
    if(sel_iter_init)
        if(H5S_SELECT_ITER_RELEASE(&sel_iter) < 0)
            HDONE_ERROR(H5E_DATASPACE, H5E_CANTRELEASE, FAIL, "unable to release selection iterator")

#ifdef H5S_DEBUG
if(H5DEBUG(S))
    HDfprintf(H5DEBUG(S), "Leave %s, count=%ld  is_derived_type=%t\n", FUNC, *count, *is_derived_type);
#endif
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S__mpio_reg_hyper_type() */


/*-------------------------------------------------------------------------
 * Function:	H5S__mpio_span_hyper_type
 *
 * Purpose:	Translate an HDF5 irregular hyperslab selection into an
                MPI type.
 *
 * Return:	Non-negative on success, negative on failure.
 *
 * Outputs:	*new_type	  the MPI type corresponding to the selection
 *		*count		  how many objects of the new_type in selection
 *				  (useful if this is the buffer type for xfer)
 *		*is_derived_type  0 if MPI primitive type, 1 if derived
 *
 * Programmer:  kyang
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5S__mpio_span_hyper_type(const H5S_t *space, size_t elmt_size,
    MPI_Datatype *new_type, int *count, hbool_t *is_derived_type)
{
    H5S_mpio_mpitype_list_t type_list;  /* List to track MPI data types created */
    MPI_Datatype  elmt_type;            /* MPI datatype for an element */
    hbool_t elmt_type_is_derived = FALSE;       /* Whether the element type has been created */
    MPI_Datatype  span_type;            /* MPI datatype for overall span tree */
    hsize_t       bigio_count;          /* Transition point to create derived type */
    hsize_t       down[H5S_MAX_RANK];   /* 'down' sizes for each dimension */
    uint64_t      op_gen;               /* Operation generation value */
    int           mpi_code;             /* MPI return code */
    herr_t        ret_value = SUCCEED;  /* Return value */

    FUNC_ENTER_STATIC

    /* Check args */
    HDassert(space);
    HDassert(space->extent.size);
    HDassert(space->select.sel_info.hslab->span_lst);
    HDassert(space->select.sel_info.hslab->span_lst->head);

    bigio_count = H5_mpi_get_bigio_count();
    /* Create the base type for an element */
    if(bigio_count >= elmt_size) {
        if(MPI_SUCCESS != (mpi_code = MPI_Type_contiguous((int)elmt_size, MPI_BYTE, &elmt_type)))
            HMPI_GOTO_ERROR(FAIL, "MPI_Type_contiguous failed", mpi_code)
    } /* end if */
    else
        if(H5_mpio_create_large_type(elmt_size, 0, MPI_BYTE, &elmt_type) < 0)
            HGOTO_ERROR(H5E_DATASPACE, H5E_BADTYPE, FAIL, "couldn't create a large element datatype in span_hyper selection")
    elmt_type_is_derived = TRUE;

    /* Compute 'down' sizes for each dimension */
    if(H5VM_array_down(space->extent.rank, space->extent.size, down) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTGETSIZE, FAIL, "couldn't compute 'down' dimension sizes")

    /* Acquire an operation generation value for creating MPI datatypes */
    op_gen = H5S__hyper_get_op_gen();

    /* Obtain derived MPI data type */
    type_list.head = type_list.tail = NULL;
    if(H5S__obtain_datatype(space->select.sel_info.hslab->span_lst, down, elmt_size, &elmt_type, &span_type, &type_list, op_gen) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_BADTYPE, FAIL, "couldn't obtain MPI derived data type")
    if(MPI_SUCCESS != (mpi_code = MPI_Type_dup(span_type, new_type)))
        HMPI_GOTO_ERROR(FAIL, "MPI_Type_commit failed", mpi_code)
    if(MPI_SUCCESS != (mpi_code = MPI_Type_commit(new_type)))
        HMPI_GOTO_ERROR(FAIL, "MPI_Type_commit failed", mpi_code)

    /* Release MPI data types generated during span tree traversal */
    if(H5S__release_datatype(&type_list) < 0)
        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTRELEASE, FAIL, "couldn't release MPI derived data type")

    /* fill in the remaining return values */
    *count = 1;
    *is_derived_type = TRUE;

done:
    /* Release resources */
    if(elmt_type_is_derived)
        if(MPI_SUCCESS != (mpi_code = MPI_Type_free(&elmt_type)))
            HMPI_DONE_ERROR(FAIL, "MPI_Type_free failed", mpi_code)

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S__mpio_span_hyper_type() */


/*-------------------------------------------------------------------------
 * Function:	H5S__release_datatype
 *
 * Purpose:	Release the MPI derived datatypes for span-tree hyperslab selection
 *
 * Return:	Non-negative on success, negative on failure.
 *
 * Programmer:	Quincey Koziol, February 2, 2019
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5S__release_datatype(H5S_mpio_mpitype_list_t *type_list)
{
    H5S_mpio_mpitype_node_t *curr;      /* Pointer to head of list */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity check */
    HDassert(type_list);

    /* Iterate over the list, freeing the MPI data types */
    curr = type_list->head;
    while(curr) {
        H5S_mpio_mpitype_node_t *next;  /* Pointer to next node in list */
        int mpi_code;                   /* MPI return status code */

        /* Release the MPI data type for this span tree */
        if(MPI_SUCCESS != (mpi_code = MPI_Type_free(&curr->type)))
            HMPI_GOTO_ERROR(FAIL, "MPI_Type_free failed", mpi_code)

        /* Get pointer to next node in list */
        next = curr->next;

        /* Free the current node */
        curr = H5FL_FREE(H5S_mpio_mpitype_node_t, curr);

        /* Advance to next node */
        curr = next;
    } /* end while */

done:
  FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S__release_datatype() */


/*-------------------------------------------------------------------------
 * Function:	H5S__obtain_datatype
 *
 * Purpose:	Obtain an MPI derived datatype for span-tree hyperslab selection
 *
 * Return:	Non-negative on success, negative on failure.
 *
 * Outputs:	*span_type	 the MPI type corresponding to the selection
 *
 * Programmer:  kyang
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5S__obtain_datatype(H5S_hyper_span_info_t *spans, const hsize_t *down,
    size_t elmt_size, const MPI_Datatype *elmt_type, MPI_Datatype *span_type,
    H5S_mpio_mpitype_list_t *type_list, uint64_t op_gen)
{
    H5S_hyper_span_t      *span;                /* Hyperslab span to iterate with */
    hsize_t               bigio_count;          /* Transition point to create derived type */

    size_t                alloc_count = 0;      /* Number of span tree nodes allocated at this level */
    size_t                outercount = 0;       /* Number of span tree nodes at this level */
    MPI_Datatype          *inner_type = NULL;
    hbool_t inner_types_freed = FALSE;          /* Whether the inner_type MPI datatypes have been freed */
    int                   *blocklen = NULL;
    MPI_Aint              *disp = NULL;
    size_t                u;                    /* Local index variable */
    int                   mpi_code;             /* MPI return status code */
    herr_t                ret_value = SUCCEED;  /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity check */
    HDassert(spans);
    HDassert(type_list);

    bigio_count = H5_mpi_get_bigio_count();
    /* Check if we've visited this span tree before */
    if(spans->op_gen != op_gen) {
        H5S_mpio_mpitype_node_t *type_node;     /* Pointer to new node in MPI data type list */

        /* Allocate the initial displacement & block length buffers */
        alloc_count = H5S_MPIO_INITIAL_ALLOC_COUNT;
        if(NULL == (disp = (MPI_Aint *)H5MM_malloc(alloc_count * sizeof(MPI_Aint))))
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate array of displacements")
        if(NULL == (blocklen = (int *)H5MM_malloc(alloc_count * sizeof(int))))
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate array of block lengths")

        /* If this is the fastest changing dimension, it is the base case for derived datatype. */
        span = spans->head;
        if(NULL == span->down) {
            hbool_t large_block = FALSE;                /* Wether the block length is larger than 32 bit integer */

            outercount = 0;
            while(span) {
                hsize_t nelmts;     /* # of elements covered by current span */

                /* Check if we need to increase the size of the buffers */
                if(outercount >= alloc_count) {
                    MPI_Aint     *tmp_disp;         /* Temporary pointer to new displacement buffer */
                    int          *tmp_blocklen;     /* Temporary pointer to new block length buffer */

                    /* Double the allocation count */
                    alloc_count *= 2;

                    /* Re-allocate the buffers */
                    if(NULL == (tmp_disp = (MPI_Aint *)H5MM_realloc(disp, alloc_count * sizeof(MPI_Aint))))
                        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate array of displacements")
                    disp = tmp_disp;
                    if(NULL == (tmp_blocklen = (int *)H5MM_realloc(blocklen, alloc_count * sizeof(int))))
                        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate array of block lengths")
                    blocklen = tmp_blocklen;
                } /* end if */

                /* Compute the number of elements to attempt in this span */
                nelmts = (span->high - span->low) + 1;

                /* Store displacement & block length */
                disp[outercount]      = (MPI_Aint)elmt_size * span->low;
                H5_CHECK_OVERFLOW(nelmts, hsize_t, int)
                blocklen[outercount]  = (int)nelmts;

                if(bigio_count < (hsize_t)blocklen[outercount])
                    large_block = TRUE; /* at least one block type is large, so set this flag to true */

                span = span->next;
                outercount++;
            } /* end while */

            /* Everything fits into integers, so cast them and use hindexed */
            if(bigio_count >= outercount && large_block == FALSE) {
                if(MPI_SUCCESS != (mpi_code = MPI_Type_create_hindexed((int)outercount, blocklen, disp, *elmt_type, &spans->u.down_type)))
                   HMPI_GOTO_ERROR(FAIL, "MPI_Type_create_hindexed failed", mpi_code)
            } /* end if */
            else {      /* LARGE_DATATYPE:: Something doesn't fit into a 32 bit integer */
                for(u = 0 ; u < outercount; u++) {
                    MPI_Datatype temp_type = MPI_DATATYPE_NULL;

                    /* create the block type from elmt_type while checking the 32 bit int limit */
                    if((hsize_t)(blocklen[u]) > bigio_count) {
                        if(H5_mpio_create_large_type(blocklen[u], 0, *elmt_type, &temp_type) < 0)
                            HGOTO_ERROR(H5E_DATASPACE, H5E_BADTYPE, FAIL, "couldn't create a large element datatype in span_hyper selection")
                    } /* end if */
                    else
                        if(MPI_SUCCESS != (mpi_code = MPI_Type_contiguous((int)blocklen[u], *elmt_type, &temp_type)))
                            HMPI_GOTO_ERROR(FAIL, "MPI_Type_contiguous failed", mpi_code)

                    /* Combine the current datatype that is created with this current block type */
                    if(0 == u)      /* first iteration, there is no combined datatype yet */
                        spans->u.down_type = temp_type;
                    else {
                        int bl[2] = {1, 1};
                        MPI_Aint ds[2] = {disp[u - 1], disp[u]};
                        MPI_Datatype dt[2] = {spans->u.down_type, temp_type};

                        if(MPI_SUCCESS != (mpi_code = MPI_Type_create_struct(2,              /* count */
                                                                             bl,             /* blocklength */
                                                                             ds,             /* stride in bytes*/
                                                                             dt,             /* old type */
                                                                             &spans->u.down_type)))  /* new type */
                            HMPI_GOTO_ERROR(FAIL, "MPI_Type_create_struct failed", mpi_code)

                        /* Release previous temporary datatype */
                        if(MPI_SUCCESS != (mpi_code = MPI_Type_free(&temp_type)))
                            HMPI_GOTO_ERROR(FAIL, "MPI_Type_free failed", mpi_code)
                    } /* end else */
                } /* end for */
            } /* end else (LARGE_DATATYPE::) */
        } /* end if */
        else {
            MPI_Aint stride;            /* Distance between inner MPI datatypes */

            if(NULL == (inner_type = (MPI_Datatype *)H5MM_malloc(alloc_count * sizeof(MPI_Datatype))))
                HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate array of inner MPI datatypes")

            /* Calculate the total bytes of the lower dimension */
            stride = (*down) * elmt_size;

            /* Loop over span nodes */
            outercount = 0;
            while(span) {
                MPI_Datatype down_type;     /* Temporary MPI datatype for a span tree node's children */
                hsize_t nelmts;             /* # of elements covered by current span */

                /* Check if we need to increase the size of the buffers */
                if(outercount >= alloc_count) {
                    MPI_Aint     *tmp_disp;         /* Temporary pointer to new displacement buffer */
                    int          *tmp_blocklen;     /* Temporary pointer to new block length buffer */
                    MPI_Datatype *tmp_inner_type;   /* Temporary pointer to inner MPI datatype buffer */

                    /* Double the allocation count */
                    alloc_count *= 2;

                    /* Re-allocate the buffers */
                    if(NULL == (tmp_disp = (MPI_Aint *)H5MM_realloc(disp, alloc_count * sizeof(MPI_Aint))))
                        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate array of displacements")
                    disp = tmp_disp;
                    if(NULL == (tmp_blocklen = (int *)H5MM_realloc(blocklen, alloc_count * sizeof(int))))
                        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate array of block lengths")
                    blocklen = tmp_blocklen;
                    if(NULL == (tmp_inner_type = (MPI_Datatype *)H5MM_realloc(inner_type, alloc_count * sizeof(MPI_Datatype))))
                        HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate array of inner MPI datatypes")
                    inner_type = tmp_inner_type;
                } /* end if */

                /* Displacement should be in byte and should have dimension information */
                /* First using MPI Type vector to build derived data type for this span only */
                /* Need to calculate the disp in byte for this dimension. */
                disp[outercount]      = span->low * stride;
                blocklen[outercount]  = 1;

                /* Generate MPI datatype for next dimension down */
                if(H5S__obtain_datatype(span->down, down + 1, elmt_size, elmt_type, &down_type, type_list, op_gen) < 0)
                    HGOTO_ERROR(H5E_DATASPACE, H5E_BADTYPE, FAIL, "couldn't obtain MPI derived data type")

                /* Compute the number of elements to attempt in this span */
                nelmts = (span->high - span->low) + 1;

                /* Build the MPI datatype for this node */
                H5_CHECK_OVERFLOW(nelmts, hsize_t, int)
                if(MPI_SUCCESS != (mpi_code = MPI_Type_create_hvector((int)nelmts, 1, stride, down_type, &inner_type[outercount])))
                    HMPI_GOTO_ERROR(FAIL, "MPI_Type_create_hvector failed", mpi_code)

                span = span->next;
                outercount++;
             } /* end while */

            /* Building the whole vector datatype */
            H5_CHECK_OVERFLOW(outercount, size_t, int)
            if(MPI_SUCCESS != (mpi_code = MPI_Type_create_struct((int)outercount, blocklen, disp, inner_type, &spans->u.down_type)))
                HMPI_GOTO_ERROR(FAIL, "MPI_Type_create_struct failed", mpi_code)

            /* Release inner node types */
            for(u = 0; u < outercount; u++)
                if(MPI_SUCCESS != (mpi_code = MPI_Type_free(&inner_type[u])))
                    HMPI_GOTO_ERROR(FAIL, "MPI_Type_free failed", mpi_code)
            inner_types_freed = TRUE;
        } /* end else */

        /* Allocate space for the MPI data type list node */
        if(NULL == (type_node = H5FL_MALLOC(H5S_mpio_mpitype_node_t)))
            HGOTO_ERROR(H5E_DATASPACE, H5E_CANTALLOC, FAIL, "can't allocate MPI data type list node")

        /* Set up MPI type node */
        type_node->type = spans->u.down_type;
        type_node->next = NULL;

        /* Add MPI type node to list */
        if(type_list->head == NULL)
            type_list->head = type_list->tail = type_node;
        else {
            type_list->tail->next = type_node;
            type_list->tail = type_node;
        } /* end else */

        /* Remember that we've visited this span tree */
        spans->op_gen = op_gen;
    } /* end else */

    /* Return MPI data type for span tree */
    *span_type = spans->u.down_type;

done:
    /* General cleanup */
    if(inner_type != NULL) {
        if(!inner_types_freed)
            for(u = 0; u < outercount; u++)
                if(MPI_SUCCESS != (mpi_code = MPI_Type_free(&inner_type[u])))
                    HMPI_DONE_ERROR(FAIL, "MPI_Type_free failed", mpi_code)
        H5MM_free(inner_type);
    } /* end if */
    if(blocklen != NULL)
        H5MM_free(blocklen);
    if(disp != NULL)
        H5MM_free(disp);

  FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S__obtain_datatype() */


/*-------------------------------------------------------------------------
 * Function:	H5S_mpio_space_type
 *
 * Purpose:	Translate an HDF5 dataspace selection into an MPI type.
 *		Currently handle only hyperslab and "all" selections.
 *
 * Return:	Non-negative on success, negative on failure.
 *
 * Outputs:	*new_type	  the MPI type corresponding to the selection
 *		*count		  how many objects of the new_type in selection
 *				  (useful if this is the buffer type for xfer)
 *		*is_derived_type  0 if MPI primitive type, 1 if derived
 *
 * Programmer:	rky 980813
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5S_mpio_space_type(const H5S_t *space, size_t elmt_size, MPI_Datatype *new_type,
    int *count, hbool_t *is_derived_type, hbool_t do_permute, hsize_t **permute_map,
    hbool_t *is_permuted)
{
    herr_t	ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /* Check args */
    HDassert(space);
    HDassert(elmt_size);

    /* Create MPI type based on the kind of selection */
    switch(H5S_GET_EXTENT_TYPE(space)) {
        case H5S_NULL:
        case H5S_SCALAR:
        case H5S_SIMPLE:
            /* If the file space has been permuted previously due to
             * out-of-order point selection, then permute this selection which
             * should be a memory selection to match the file space permutation.
             */
            if(TRUE == *is_permuted) {
                switch(H5S_GET_SELECT_TYPE(space)) {
                    case H5S_SEL_NONE:
                        if(H5S__mpio_none_type(new_type, count, is_derived_type) < 0)
                            HGOTO_ERROR(H5E_DATASPACE, H5E_BADTYPE, FAIL, "couldn't convert 'none' selection to MPI type")
                        break;

                    case H5S_SEL_ALL:
                    case H5S_SEL_POINTS:
                    case H5S_SEL_HYPERSLABS:
                        /* Sanity check */
                        HDassert(!do_permute);

                        if(H5S__mpio_permute_type(space, elmt_size, permute_map, new_type, count, is_derived_type) < 0)
                            HGOTO_ERROR(H5E_DATASPACE, H5E_BADTYPE, FAIL, "couldn't convert 'all' selection to MPI type")
                        break;

                    case H5S_SEL_ERROR:
                    case H5S_SEL_N:
                    default:
                        HDassert("unknown selection type" && 0);
                        break;
                } /* end switch */
            } /* end if */
            /* the file space is not permuted, so do a regular selection */
            else {
                switch(H5S_GET_SELECT_TYPE(space)) {
                    case H5S_SEL_NONE:
                        if(H5S__mpio_none_type(new_type, count, is_derived_type) < 0)
                            HGOTO_ERROR(H5E_DATASPACE, H5E_BADTYPE, FAIL,"couldn't convert 'none' selection to MPI type")
                        break;

                    case H5S_SEL_ALL:
                        if(H5S__mpio_all_type(space, elmt_size, new_type, count, is_derived_type) < 0)
                            HGOTO_ERROR(H5E_DATASPACE, H5E_BADTYPE, FAIL,"couldn't convert 'all' selection to MPI type")
                        break;

                    case H5S_SEL_POINTS:
                        if(H5S__mpio_point_type(space, elmt_size, new_type, count, is_derived_type, do_permute, permute_map, is_permuted) < 0)
                           HGOTO_ERROR(H5E_DATASPACE, H5E_BADTYPE, FAIL, "couldn't convert 'point' selection to MPI type")
                        break;

                    case H5S_SEL_HYPERSLABS:
                        if((H5S_SELECT_IS_REGULAR(space) == TRUE)) {
                            if(H5S__mpio_reg_hyper_type(space, elmt_size, new_type, count, is_derived_type) < 0)
                                HGOTO_ERROR(H5E_DATASPACE, H5E_BADTYPE, FAIL,"couldn't convert regular 'hyperslab' selection to MPI type")
                        } /* end if */
                        else
                            if(H5S__mpio_span_hyper_type(space, elmt_size, new_type, count, is_derived_type) < 0)
                                HGOTO_ERROR(H5E_DATASPACE, H5E_BADTYPE, FAIL,"couldn't convert irregular 'hyperslab' selection to MPI type")
                        break;

                    case H5S_SEL_ERROR:
                    case H5S_SEL_N:
                    default:
                        HDassert("unknown selection type" && 0);
                        break;
                } /* end switch */
            } /* end else */
            break;

        case H5S_NO_CLASS:
        default:
            HDassert("unknown dataspace type" && 0);
            break;
    } /* end switch */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5S_mpio_space_type() */

#endif  /* H5_HAVE_PARALLEL */

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