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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: cartrank.c,v 6.5 2002/12/11 19:15:09 jsquyres Exp $
*
* Function: - translate coordinates to rank
* Accepts: - communicator
* - coordinates array
* - ptr rank (returned value)
* Returns: - MPI_SUCCESS or error code
*/
#include <blktype.h>
#include <mpi.h>
#include <mpisys.h>
/*@
MPI_Cart_rank - Determines process rank in communicator given Cartesian
location
Input Parameters:
+ comm - communicator with cartesian structure (handle)
- coords - integer array (of size 'ndims') specifying the cartesian
coordinates of a process
Output Parameter:
. prank - rank of specified process (integer)
.N fortran
.N Errors
.N MPI_SUCCESS
.N MPI_ERR_COMM
.N MPI_ERR_TOPOLOGY
.N MPI_ERR_ARG
.N ACK
@*/
int MPI_Cart_rank(MPI_Comm comm, int *coords, int *prank)
{
int rank;
int dim;
int ord;
int factor;
int i;
int *d;
int *c;
lam_initerr();
lam_setfunc(BLKMPICARTRANK);
/*
* Check the arguments.
*/
if (comm == MPI_COMM_NULL) {
return(lam_errfunc(MPI_COMM_WORLD,
BLKMPICARTRANK, lam_mkerr(MPI_ERR_COMM, EINVAL)));
}
if (LAM_IS_INTER(comm)) {
return(lam_errfunc(comm,
BLKMPICARTRANK, lam_mkerr(MPI_ERR_COMM, EINVAL)));
}
if (!LAM_IS_CART(comm)) {
return(lam_errfunc(comm, BLKMPICARTRANK,
lam_mkerr(MPI_ERR_TOPOLOGY, EINVAL)));
}
if ((coords == 0) || (prank == 0)) {
return(lam_errfunc(comm,
BLKMPICARTRANK, lam_mkerr(MPI_ERR_ARG, EINVAL)));
}
/*
* Loop over coordinates computing the rank.
*/
factor = 1;
rank = 0;
i = comm->c_topo_ndims - 1;
d = comm->c_topo_dims + i;
c = coords + i;
for (; i >= 0; --i, --c, --d) {
dim = (*d > 0) ? *d : -(*d);
ord = *c;
if ((ord < 0) || (ord >= dim)) {
if (*d > 0) {
return(lam_errfunc(comm, BLKMPICARTRANK,
lam_mkerr(MPI_ERR_ARG, EINVAL)));
}
ord %= dim;
if (ord < 0) {
ord += dim;
}
}
rank += factor * ord;
factor *= dim;
}
*prank = rank;
lam_resetfunc(BLKMPICARTRANK);
return(MPI_SUCCESS);
}
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