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/*
* Copyright (c) 2001-2002 The Trustees of Indiana University.
* All rights reserved.
* Copyright (c) 1998-2001 University of Notre Dame.
* All rights reserved.
* Copyright (c) 1994-1998 The Ohio State University.
* All rights reserved.
*
* This file is part of the LAM/MPI software package. For license
* information, see the LICENSE file in the top level directory of the
* LAM/MPI source distribution.
*
* $HEADER$
*
* $Id: tvector.c,v 6.7 2002/12/11 19:15:14 jsquyres Exp $
*
* Function: - create vector derived datatype
* Accepts: - # blocks
* - block length
* - block stride
* - element datatype
* - new datatype (out)
* Returns: - MPI_SUCCESS or error code
*/
#include <stdlib.h>
#include <blktype.h>
#include <mpi.h>
#include <mpisys.h>
#include <terror.h>
/*@
MPI_Type_vector - Creates a vector (strided) datatype
Input Parameters:
+ count - number of blocks (nonnegative integer)
. length - number of elements in each block
(nonnegative integer)
. stride - number of elements between start of each block (integer)
- oldtype - old datatype (handle)
Output Parameter:
. newtype - new datatype (handle)
Notes:
Once a datatype is no longer being used, it should be freed with
'MPI_Type_free'.
.N fortran
.N Errors
.N MPI_SUCCESS
.N MPI_ERR_TYPE
.N MPI_ERR_COUNT
.N MPI_ERR_ARG
.N MPI_ERR_EXHAUSTED
.seealso MPI_Type_free
.N ACK
@*/
int MPI_Type_vector(int count, int length, int stride,
MPI_Datatype oldtype, MPI_Datatype *newtype)
{
MPI_Datatype ntype; /* new datatype */
/*
* Check the arguments.
*/
if (oldtype == MPI_DATATYPE_NULL) {
return(lam_errfunc(MPI_COMM_WORLD,
BLKMPITVECTOR, lam_mkerr(MPI_ERR_TYPE, EINVAL)));
}
if (count < 0) {
return(lam_errfunc(MPI_COMM_WORLD,
BLKMPITVECTOR, lam_mkerr(MPI_ERR_COUNT, EINVAL)));
}
if ((length < 0) || (newtype == 0)) {
return(lam_errfunc(MPI_COMM_WORLD,
BLKMPITVECTOR, lam_mkerr(MPI_ERR_ARG, EINVAL)));
}
/*
* Create the new datatype.
*/
ntype = (MPI_Datatype) malloc(sizeof(struct _dtype));
if (ntype == 0) {
return(lam_errfunc(MPI_COMM_WORLD,
BLKMPITVECTOR, lam_mkerr(MPI_ERR_OTHER, errno)));
}
oldtype->dt_refcount++;
lam_type_setdefaults(ntype);
ntype->dt_format = LAM_DTVECTOR;
ntype->dt_count = count;
ntype->dt_length = length;
ntype->dt_stride = stride;
ntype->dt_dtype = oldtype;
if (count > 0) {
lam_dtblock(ntype, oldtype, length, 0);
if (count > 1 && (stride != length
|| !(oldtype->dt_flags & LAM_DTNOXADJ))) {
ntype->dt_flags &= ~LAM_DTNOPACK;
}
ntype->dt_nelem *= count;
ntype->dt_size *= count;
stride *= (oldtype->dt_upper - oldtype->dt_lower) * (count - 1);
if (stride < 0) {
ntype->dt_datalow += stride;
ntype->dt_lower += stride;
} else {
ntype->dt_dataup += stride;
ntype->dt_upper += stride;
}
lam_dtalign(ntype);
}
else {
ntype->dt_flags = (LAM_DTNOPACK | LAM_DTNOXADJ);
ntype->dt_size = 0;
}
*newtype = ntype;
lam_resetfunc(BLKMPITVECTOR);
return(MPI_SUCCESS);
}
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