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

/*

 *

 *  (C) 2003 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpi.h"

#include <stdio.h>

#include <stdlib.h>

#include "mpitest.h"

#include "mpitestconf.h"

#ifdef HAVE_STRING_H

#include <string.h>

#endif

/*

static char MTEST_Descrip[] = "Test file_set_view";

*/

/*

 * access style is explicitly described as modifiable.  values include

 * read_once, read_mostly, write_once, write_mostlye, random

 *

 *

 */

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

{

    int errs = 0, err;

    int buf[10];

    int rank;

    MPI_Comm comm;

    MPI_Status status;

    MPI_File fh;

    MPI_Info infoin, infoout;

    char value[1024];

    int flag, count;

    MTest_Init(&argc, &argv);

    comm = MPI_COMM_WORLD;

    MPI_Comm_rank(comm, &rank;;

    MPI_Info_create(&infoin);

    MPI_Info_set(infoin, (char *) "access_style", (char *) "write_once,random");

    MPI_File_open(comm, (char *) "testfile", MPI_MODE_RDWR | MPI_MODE_CREATE, infoin, &fh;;

    buf[0] = rank;

    err = MPI_File_write_ordered(fh, buf, 1, MPI_INT, &status);

    if (err) {

        errs++;

        MTestPrintError(err);

    }

    MPI_Info_set(infoin, (char *) "access_style", (char *) "read_once");

    err = MPI_File_seek_shared(fh, 0, MPI_SEEK_SET);

    if (err) {

        errs++;

        MTestPrintError(err);

    }

    err = MPI_File_set_info(fh, infoin);

    if (err) {

        errs++;

        MTestPrintError(err);

    }

    MPI_Info_free(&infoin);

    buf[0] = -1;

    err = MPI_File_read_ordered(fh, buf, 1, MPI_INT, &status);

    if (err) {

        errs++;

        MTestPrintError(err);

    }

    MPI_Get_count(&status, MPI_INT, &count);

    if (count != 1) {

        errs++;

        printf("Expected to read one int, read %d\n", count);

    }

    if (buf[0] != rank) {

        errs++;

        printf("Did not read expected value (%d)\n", buf[0]);

    }

    err = MPI_File_get_info(fh, &infoout);

    if (err) {

        errs++;

        MTestPrintError(err);

    }

    MPI_Info_get(infoout, (char *) "access_style", 1024, value, &flag;;

    /* Note that an implementation is allowed to ignore the set_info,

     * so we'll accept either the original or the updated version */

    if (!flag) {

        ;

        /*

         * errs++;

         * printf("Access style hint not saved\n");

         */

    } else {

        if (strcmp(value, "read_once") != 0 && strcmp(value, "write_once,random") != 0) {

            errs++;

            printf("value for access_style unexpected; is %s\n", value);

        }

    }

    MPI_Info_free(&infoout);

    err = MPI_File_close(&fh;;

    if (err) {

        errs++;

        MTestPrintError(err);

    }

    MPI_Barrier(comm);

    MPI_Comm_rank(comm, &rank;;

    if (rank == 0) {

        err = MPI_File_delete((char *) "testfile", MPI_INFO_NULL);

        if (err) {

            errs++;

            MTestPrintError(err);

        }

    }

    MTest_Finalize(errs);

    return MTestReturnValue(errs);

}