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/*
* Copyright (C) by Argonne National Laboratory
* See COPYRIGHT in top-level directory
*/
#include <mpi.h>
#include <stdio.h>
#include "mpitest.h"
int main(int argc, char **argv)
{
MPI_Group basegroup;
MPI_Group g1, g2;
MPI_Comm comm, newcomm, dupcomm;
int rank, size;
int worldrank;
int errs = 0, errclass, mpi_errno;
MTest_Init(&argc, &argv);
MPI_Comm_rank(MPI_COMM_WORLD, &worldrank);
comm = MPI_COMM_WORLD;
MPI_Comm_group(comm, &basegroup);
MPI_Comm_rank(comm, &rank);
MPI_Comm_size(comm, &size);
MPI_Comm_set_errhandler(MPI_COMM_WORLD, MPI_ERRORS_RETURN);
MPI_Comm_split(comm, 0, size - rank, &newcomm);
MPI_Comm_group(newcomm, &g1);
MPI_Comm_dup(comm, &dupcomm);
MPI_Comm_group(dupcomm, &g2);
/* checking group_difference for NULL variable */
mpi_errno = MPI_Group_difference(g1, g2, NULL);
MPI_Error_class(mpi_errno, &errclass);
if (errclass != MPI_ERR_ARG)
++errs;
MPI_Group_free(&basegroup);
MPI_Group_free(&g1);
MPI_Group_free(&g2);
MPI_Comm_free(&newcomm);
MPI_Comm_free(&dupcomm);
MTest_Finalize(errs);
return 0;
}
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