/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */

/*

 *  (C) 2015 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

/* This test tests overlapping of Comm_idups with other comm. generations calls */

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include "mpi.h"

#include "mpitest.h"

#define NUM_IDUPS 5

int main(int argc, char **argv)

{

    int errs = 0;

    int i;

    int rank, size;

    int *excl;

    int ranges[1][3];

    int isLeft, rleader;

    MPI_Group world_group, high_group, even_group;

    MPI_Comm local_comm, inter_comm, test_comm, outcomm;

    MPI_Comm idupcomms[NUM_IDUPS];

    MPI_Request reqs[NUM_IDUPS];

    MTest_Init(&argc, &argv);

    MPI_Comm_rank(MPI_COMM_WORLD, &rank;;

    MPI_Comm_size(MPI_COMM_WORLD, &size);

    MPI_Comm_group(MPI_COMM_WORLD, &world_group);

    if (size < 2) {

        printf("this test requires at least 2 processes\n");

        MPI_Abort(MPI_COMM_WORLD, 1);

    }

    /* Idup MPI_COMM_WORLD multiple times */

    for (i = 0; i < NUM_IDUPS; i++) {

        MPI_Comm_idup(MPI_COMM_WORLD, &idupcomms[i], &reqs[i]);

    }

    /* Overlap pending idups with various comm generation functions */

    /* Comm_dup */

    MPI_Comm_dup(MPI_COMM_WORLD, &outcomm);

    errs += MTestTestComm(outcomm);

    MTestFreeComm(&outcomm);

    /* Comm_split */

    MPI_Comm_split(MPI_COMM_WORLD, rank % 2, size - rank, &outcomm);

    errs += MTestTestComm(outcomm);

    MTestFreeComm(&outcomm);

    /* Comm_create, high half of MPI_COMM_WORLD */

    ranges[0][0] = size / 2;

    ranges[0][1] = size - 1;

    ranges[0][2] = 1;

    MPI_Group_range_incl(world_group, 1, ranges, &high_group);

    MPI_Comm_create(MPI_COMM_WORLD, high_group, &outcomm);

    MPI_Group_free(&high_group);

    errs += MTestTestComm(outcomm);

    MTestFreeComm(&outcomm);

    /* Comm_create_group, even ranks of MPI_COMM_WORLD */

    /* exclude the odd ranks */

    excl = malloc((size / 2) * sizeof(int));

    for (i = 0; i < size / 2; i++)

        excl[i] = (2 * i) + 1;

    MPI_Group_excl(world_group, size / 2, excl, &even_group);

    free(excl);

    if (rank % 2 == 0) {

        MPI_Comm_create_group(MPI_COMM_WORLD, even_group, 0, &outcomm);

    } else {

        outcomm = MPI_COMM_NULL;

    }

    MPI_Group_free(&even_group);

    errs += MTestTestComm(outcomm);

    MTestFreeComm(&outcomm);

    /* Intercomm_create & Intercomm_merge */

    MPI_Comm_split(MPI_COMM_WORLD, (rank < size / 2), rank, &local_comm);

    if (rank == 0) {

        rleader = size / 2;

    } else if (rank == size / 2) {

        rleader = 0;

    } else {

        rleader = -1;

    }

    isLeft = rank < size / 2;

    MPI_Intercomm_create(local_comm, 0, MPI_COMM_WORLD, rleader, 99, &inter_comm);

    MPI_Intercomm_merge(inter_comm, isLeft, &outcomm);

    MPI_Comm_free(&local_comm);

    errs += MTestTestComm(inter_comm);

    MTestFreeComm(&inter_comm);

    errs += MTestTestComm(outcomm);

    MTestFreeComm(&outcomm);

    MPI_Waitall(NUM_IDUPS, reqs, MPI_STATUSES_IGNORE);

    for (i = 0; i < NUM_IDUPS; i++) {

        errs += MTestTestComm(idupcomms[i]);

        MPI_Comm_free(&idupcomms[i]);

    }

    MPI_Group_free(&world_group);

    MTest_Finalize(errs);

    return MTestReturnValue(errs);

}