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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: csize.c,v 6.5 2002/12/11 19:15:10 jsquyres Exp $
*
* Function: - return the size of the communicator's group
* Accepts: - communicator
* - ptr to size (returned value)
* Returns: - MPI_SUCCESS or error code
*/
#include <blktype.h>
#include <mpi.h>
#include <mpisys.h>
/*@
MPI_Comm_size - Determines the size of the group associated with a
communictor
Input Parameter:
. comm - communicator (handle - must be intracommunicator)
Output Parameter:
. psize - number of processes in the group of 'comm' (integer)
Notes:
'MPI_COMM_NULL' is `not` considered a valid argument to this function.
.N fortran
.N Errors
.N MPI_SUCCESS
.N MPI_ERR_COMM
.N MPI_ERR_ARG
.N ACK
@*/
int MPI_Comm_size(MPI_Comm comm, int *psize)
{
lam_initerr();
lam_setfunc(BLKMPICOMMSIZE);
if (comm == MPI_COMM_NULL) {
return(lam_errfunc(MPI_COMM_WORLD,
BLKMPICOMMSIZE, lam_mkerr(MPI_ERR_COMM, EINVAL)));
}
if (psize == 0) {
return(lam_errfunc(comm,
BLKMPICOMMSIZE, lam_mkerr(MPI_ERR_ARG, EINVAL)));
}
*psize = comm->c_group->g_nprocs;
lam_resetfunc(BLKMPICOMMSIZE);
return(MPI_SUCCESS);
}
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