openmpi/ompi/mpi/c/group_range_excl.c

/*
 * 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_range_excl = PMPI_Group_range_excl
#endif

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

static const char FUNC_NAME[] = "MPI_Group_range_excl";


int MPI_Group_range_excl(MPI_Group group, int n_triplets, int ranges[][3],
                         MPI_Group *new_group) 
{
    int err, i, group_size,index,*elements_int_list;
    

    /* can't act on NULL group */
    if( MPI_PARAM_CHECK ) {
	OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
	if ( (MPI_GROUP_NULL == group) || (NULL == group) ) {
	    return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_GROUP, 
					  FUNC_NAME);
	}

	group_size = ompi_group_size ( group );
	elements_int_list = (int *) 
	    malloc(sizeof(int) * group_size);
	if (NULL == elements_int_list) {
	    return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_OTHER, 
					  FUNC_NAME);
	}
	for (i = 0; i < group_size; i++) {
	    elements_int_list[i] = -1;
	}

	for (i = 0; i < n_triplets; i++) {
	    if ((0 > ranges[i][0]) || (ranges[i][0] > group_size )) {
		return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_RANK, 
					      FUNC_NAME);
	    }
	    if ((0 > ranges[i][1]) || (ranges[i][1] > group_size )) {
		return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_RANK, 
					      FUNC_NAME);
	    }
	    if (ranges[i][2] == 0) {
		return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_RANK, 
					      FUNC_NAME);
	    }
	    if ( (ranges[i][0] < ranges[i][1])) {
	        if( ( ranges[i][2] < 0) ) {
		    return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_RANK, 
						FUNC_NAME);
		}
		/* positive stride */
		for (index = ranges[i][0]; index <= ranges[i][1]; index += ranges[i][2]) {
		    /* make sure rank has not already been selected */
		    if (elements_int_list[index] != -1) {
		        free(elements_int_list);
			return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_RANK, 
						  FUNC_NAME);
		    }
		}
	    }
	    if ( (ranges[i][0] > ranges[i][1])) { 
	          if((ranges[i][2] > 0)) {
		      return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_RANK, 
						FUNC_NAME);
		  }
		  /* negative stride */
		  for (index = ranges[i][0]; index >= ranges[i][1]; index += ranges[i][2]) {
		      /* make sure rank has not already been selected */
		      if (elements_int_list[index] != -1) {
			  free(elements_int_list);
			  return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_RANK, 
						   FUNC_NAME);
		      }
		  }
            }
	    else {
	        /* first_rank == last_rank */
	        index = ranges[i][0];
	        if (elements_int_list[index] != -1) {
		    free(elements_int_list);
		    return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_RANK, 
						     FUNC_NAME);
		}
	    }
	}
	
	free (elements_int_list);
    }

    err = ompi_group_range_excl(group,n_triplets,ranges,new_group);
    OMPI_ERRHANDLER_RETURN(err, MPI_COMM_WORLD,err,FUNC_NAME);
}