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

/*

 *

 *  (C) 2003 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include <stdio.h>

#include <stdlib.h>

#include "mpi.h"

#include "mpitest.h"

/*

static char MTEST_Descrip[] = "Test bsend message handling where \

different messages are received in different orders";

*/

/*

 * Notes on the test.

 *

 * To ensure that messages remain in the bsend buffer until received,

 * messages are sent with size MSG_SIZE (ints).

 */

#define MSG_SIZE 17000

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

{

    int errs = 0;

    int b1[MSG_SIZE], b2[MSG_SIZE], b3[MSG_SIZE], b4[MSG_SIZE];

    int src, dest, size, rank, i;

    MPI_Comm comm;

    MPI_Status status;

    MTest_Init(&argc, &argv);

    MPI_Errhandler_set(MPI_COMM_WORLD, MPI_ERRORS_RETURN);

    comm = MPI_COMM_WORLD;

    MPI_Comm_rank(comm, &rank;;

    MPI_Comm_size(comm, &size);

    if (size < 2) {

        errs++;

        fprintf(stderr, "At least 2 processes required\n");

        MPI_Abort(MPI_COMM_WORLD, 1);

    }

    src = 0;

    dest = 1;

    if (rank == src) {

        int *buf, bufsize, bsize;

        bufsize = 4 * (MSG_SIZE * sizeof(int) + MPI_BSEND_OVERHEAD);

        buf = (int *) malloc(bufsize);

        if (!buf) {

            fprintf(stderr, "Could not allocate buffer of %d bytes\n", bufsize);

            MPI_Abort(MPI_COMM_WORLD, 1);

        }

        MPI_Buffer_attach(buf, bufsize);

        /* Initialize data */

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

            b1[i] = i;

            b2[i] = MSG_SIZE + i;

            b3[i] = 2 * MSG_SIZE + i;

            b4[i] = 3 * MSG_SIZE + i;

        }

        /* Send and reset buffers after bsend returns */

        MPI_Bsend(b1, MSG_SIZE, MPI_INT, dest, 0, comm);

        for (i = 0; i < MSG_SIZE; i++)

            b1[i] = -b1[i];

        MPI_Bsend(b2, MSG_SIZE, MPI_INT, dest, 1, comm);

        for (i = 0; i < MSG_SIZE; i++)

            b2[i] = -b2[i];

        MPI_Bsend(b3, MSG_SIZE, MPI_INT, dest, 2, comm);

        for (i = 0; i < MSG_SIZE; i++)

            b3[i] = -b3[i];

        MPI_Bsend(b4, MSG_SIZE, MPI_INT, dest, 3, comm);

        for (i = 0; i < MSG_SIZE; i++)

            b4[i] = -b4[i];

        MPI_Barrier(comm);

        /* Detach waits until all messages received */

        MPI_Buffer_detach(&buf, &bsize);

        free(buf);

    }

    else if (rank == dest) {

        MPI_Barrier(comm);

        MPI_Recv(b2, MSG_SIZE, MPI_INT, src, 1, comm, &status);

        MPI_Recv(b1, MSG_SIZE, MPI_INT, src, 0, comm, &status);

        MPI_Recv(b4, MSG_SIZE, MPI_INT, src, 3, comm, &status);

        MPI_Recv(b3, MSG_SIZE, MPI_INT, src, 2, comm, &status);

        /* Check received data */

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

            if (b1[i] != i) {

                errs++;

                if (errs < 16)

                    printf("b1[%d] is %d\n", i, b1[i]);

            }

            if (b2[i] != MSG_SIZE + i) {

                errs++;

                if (errs < 16)

                    printf("b2[%d] is %d\n", i, b2[i]);

            }

            if (b3[i] != 2 * MSG_SIZE + i) {

                errs++;

                if (errs < 16)

                    printf("b3[%d] is %d\n", i, b3[i]);

            }

            if (b4[i] != 3 * MSG_SIZE + i) {

                errs++;

                if (errs < 16)

                    printf("b4[%d] is %d\n", i, b4[i]);

            }

        }

    }

    else {

        MPI_Barrier(comm);

    }

    MTest_Finalize(errs);

    MPI_Finalize();

    return 0;

}