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

/*

 *

 *  (C) 2008 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpi.h"

#include <stdio.h>

#include <stdlib.h>

#include "mpitest.h"

#include <string.h>

/*

static char MTEST_Descrip[] = "Locks with no RMA operations";

*/

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

{

    int errs = 0;

    int rank, size, i;

    MPI_Comm comm;

    MPI_Win win;

    int *winbuf, count;

    MTest_Init(&argc, &argv);

    comm = MPI_COMM_WORLD;

    MPI_Comm_rank(comm, &rank;;

    MPI_Comm_size(comm, &size);

    /* Allocate and initialize buf */

    count = 1000;

    MPI_Alloc_mem(count * sizeof(int), MPI_INFO_NULL, &winbuf);

    MPI_Win_create(winbuf, count * sizeof(int), sizeof(int), MPI_INFO_NULL, comm, &win);

    /* Clear winbuf */

    memset(winbuf, 0, count * sizeof(int));

    /* Note that for i == rank, this is a useful operation - it allows

     * the programmer to use direct loads and stores, rather than

     * put/get/accumulate, to access the local memory window. */

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

        MPI_Win_lock(MPI_LOCK_EXCLUSIVE, i, 0, win);

        MPI_Win_unlock(i, win);

    }

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

        MPI_Win_lock(MPI_LOCK_SHARED, i, 0, win);

        MPI_Win_unlock(i, win);

    }

    MPI_Win_free(&win);

    MPI_Free_mem(winbuf);

    /* If this test completes, no error has been found */

    /* A more complete test may ensure that local locks in fact block

     * remote, exclusive locks */

    MTest_Finalize(errs);

    MPI_Finalize();

    return 0;

}