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

/*

 *  (C) 2015 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpi.h"

#include <stdio.h>

#include <stdlib.h>

#include "mpitest.h"

/*

static char MTEST_Descrip[] = "Test message reception ordering issues

after cancelling a send";

*/

int main(int argc, char *argv[])

{

    int a, b, flag = 0, errs = 0;

    MPI_Request requests[2];

    MPI_Status statuses[2];

    MPI_Init(&argc, &argv);

    int rank, size;

    MPI_Comm_rank(MPI_COMM_WORLD, &rank;;

    MPI_Comm_size(MPI_COMM_WORLD, &size);

    int source = 0;

    int dest = size - 1;

    if (rank == 0) {

        a = 10;

        b = 20;

        MPI_Isend(&a, 1, MPI_INT, 1, 0, MPI_COMM_WORLD, &requests[0]);

        MPI_Isend(&b, 1, MPI_INT, 1, 0, MPI_COMM_WORLD, &requests[1]);

        MPI_Cancel(&requests[1]);

        MPI_Wait(&requests[1], &statuses[1]);

        MPI_Test_cancelled(&statuses[1], &flag;;

        if (!flag) {

            printf("Failed to cancel send");

            errs++;

        }

        MPI_Barrier(MPI_COMM_WORLD);

        MPI_Wait(&requests[0], MPI_STATUS_IGNORE);

    }

    else if (rank == 1) {

        MPI_Barrier(MPI_COMM_WORLD);

        MPI_Recv(&a, 1, MPI_INT, 0, 0, MPI_COMM_WORLD, MPI_STATUS_IGNORE);

        if (a == 20) {

            printf("Failed! got the data from the wrong send!\n");

            errs++;

        }

    }

    MTest_Finalize(errs);

    MPI_Finalize();

    return 0;

}