group_excl.c

MPI stands for the Message Passing Interface. Written by the MPI Forum (a large committee comprising

/*
 * Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2004-2005 The University of Tennessee and The University
 *                         of Tennessee Research Foundation.  All rights
 *                         reserved.
 * Copyright (c) 2004-2005 High Performance Computing Center Stuttgart, 
 *                         University of Stuttgart.  All rights reserved.
 * Copyright (c) 2004-2005 The Regents of the University of California.
 *                         All rights reserved.
 * Copyright (c) 2006      University of Houston. All rights reserved.
 * $COPYRIGHT$
 * 
 * Additional copyrights may follow
 * 
 * $HEADER$
 */
#include "ompi_config.h"
#include <stdio.h>

#include "ompi/mpi/c/bindings.h"
#include "ompi/group/group.h"
#include "ompi/errhandler/errhandler.h"
#include "ompi/communicator/communicator.h"
#include "ompi/proc/proc.h"

#if OMPI_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
#pragma weak MPI_Group_excl = PMPI_Group_excl
#endif

#if OMPI_PROFILING_DEFINES
#include "ompi/mpi/c/profile/defines.h"
#endif

static const char FUNC_NAME[] = "MPI_Group_excl";


int MPI_Group_excl(MPI_Group group, int n, int *ranks,
                   MPI_Group *new_group) 
{
    ompi_group_t *group_pointer = (ompi_group_t *)group;
    int i, err, group_size;

    group_size = ompi_group_size ( group_pointer);
    if( MPI_PARAM_CHECK ) {
        OMPI_ERR_INIT_FINALIZE(FUNC_NAME);

        /* verify that group is valid group */
        if ( (MPI_GROUP_NULL == group)  || (NULL == group) || 
                (NULL == ranks) ) {
            return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_GROUP,
                                          FUNC_NAME);
        }

        /* check that new group is no larger than old group */
        if ( n > group_size) {
            return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_GROUP,
                                          FUNC_NAME);
        }

	/* check to see if procs are within range */
        for( i=0 ; i  < n ; i++ ) {
            if( ( 0 > ranks[i] ) || (ranks[i] >= group_size)){
		return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_RANK,
					      FUNC_NAME );
	    }
	}

    }  /* end if( MPI_CHECK_ARGS) */
    
    if ( n == group_size ) {
        *new_group = MPI_GROUP_EMPTY;
        OBJ_RETAIN(MPI_GROUP_EMPTY);
        return MPI_SUCCESS;
    }

    err = ompi_group_excl ( group, n, ranks, new_group );
    OMPI_ERRHANDLER_RETURN(err, MPI_COMM_WORLD, err, FUNC_NAME );

   
}