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

/*

 *  (C) 2001 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpi.h"

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include <errno.h>

#include "mpitest.h"

/*

static char MTEST_Descrip[] = "Test contig asynchronous I/O";

*/

#define DEFAULT_SIZE (65536)

/* Uses asynchronous I/O. Each process writes to separate files and

   reads them back. The file name is taken as a command-line argument,

   and the process rank is appended to it.*/

static void handle_error(int errcode, char *str)

{

    char msg[MPI_MAX_ERROR_STRING];

    int resultlen;

    MPI_Error_string(errcode, msg, &resultlen);

    fprintf(stderr, "%s: %s\n", str, msg);

    MPI_Abort(MPI_COMM_WORLD, 1);

}

int main(int argc, char **argv)

{

    int *buf, i, rank, nints, len, err;

    char *filename = 0, *tmp;

    int errs = 0;

    int SIZE = DEFAULT_SIZE;

    MPI_File fh;

    MPI_Status status;

#ifdef MPIO_USES_MPI_REQUEST

    MPI_Request request;

#else

    MPIO_Request request;

#endif

    MTest_Init(&argc, &argv);

    MPI_Comm_rank(MPI_COMM_WORLD, &rank;;

/* process 0 takes the file name as a command-line argument and

   broadcasts it to other processes */

    if (!rank) {

        i = 1;

        argv++;

        /* Skip unrecognized arguments */

        while (i < argc) {

            if (strcmp(*argv, "-fname") == 0) {

                argv++;

                i++;

                len = (int) strlen(*argv);

                filename = (char *) malloc(len + 10);

                MTEST_VG_MEM_INIT(filename, (len + 10) * sizeof(char));

                strcpy(filename, *argv);

            }

            else if (strcmp(*argv, "-size") == 0) {

                argv++;

                i++;

                SIZE = strtol(*argv, 0, 10);

                if (errno) {

                    fprintf(stderr, "-size requires a numeric argument\n");

                    MPI_Abort(MPI_COMM_WORLD, 1);

                }

                else if (SIZE <= 0) {

                    fprintf(stderr, "-size requires a positive value\n");

                }

            }

            else {

                i++;

                argv++;

            }

        }

        if (!filename) {

            /* Use a default filename of testfile */

            len = 8;

            filename = (char *) malloc(len + 10);

            MTEST_VG_MEM_INIT(filename, (len + 10) * sizeof(char));

            strcpy(filename, "testfile");

        }

        MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);

        MPI_Bcast(filename, len + 10, MPI_CHAR, 0, MPI_COMM_WORLD);

        MPI_Bcast(&SIZE, 1, MPI_INT, 0, MPI_COMM_WORLD);

    }

    else {

        MPI_Bcast(&len, 1, MPI_INT, 0, MPI_COMM_WORLD);

        filename = (char *) malloc(len + 10);

        MPI_Bcast(filename, len + 10, MPI_CHAR, 0, MPI_COMM_WORLD);

        MPI_Bcast(&SIZE, 1, MPI_INT, 0, MPI_COMM_WORLD);

    }

    /*     printf("Starting (size=%d, file=%s)...\n", SIZE, filename); fflush(stdout); */

    buf = (int *) malloc(SIZE);

    nints = SIZE / sizeof(int);

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

        buf[i] = rank * 100000 + i;

    /* each process opens a separate file called filename.'myrank' */

    tmp = (char *) malloc(len + 10);

    strcpy(tmp, filename);

    sprintf(filename, "%s.%d", tmp, rank);

    free(tmp);

    err = MPI_File_open(MPI_COMM_SELF, filename, MPI_MODE_CREATE | MPI_MODE_RDWR,

                        MPI_INFO_NULL, &fh;;

    if (err != MPI_SUCCESS)

        handle_error(err, "MPI_File_open");

    err = MPI_File_set_view(fh, 0, MPI_INT, MPI_INT, (char *) "native", MPI_INFO_NULL);

    if (err != MPI_SUCCESS)

        handle_error(err, "MPI_File_set_view");

    err = MPI_File_iwrite(fh, buf, nints, MPI_INT, &request);

    if (err != MPI_SUCCESS)

        handle_error(err, "MPI_File_iwrtie");

#ifdef MPIO_USES_MPI_REQUEST

    MPI_Wait(&request, &status);

#else

    MPIO_Wait(&request, &status);

#endif

    MPI_File_close(&fh;;

    /* reopen the file and read the data back */

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

        buf[i] = 0;

    err = MPI_File_open(MPI_COMM_SELF, filename, MPI_MODE_CREATE | MPI_MODE_RDWR,

                        MPI_INFO_NULL, &fh;;

    if (err != MPI_SUCCESS)

        handle_error(err, "MPI_File_open (read)");

    err = MPI_File_set_view(fh, 0, MPI_INT, MPI_INT, (char *) "native", MPI_INFO_NULL);

    if (err != MPI_SUCCESS)

        handle_error(err, "MPI_File_set_view (read)");

    err = MPI_File_iread(fh, buf, nints, MPI_INT, &request);

    if (err != MPI_SUCCESS)

        handle_error(err, "MPI_File_iread");

#ifdef MPIO_USES_MPI_REQUEST

    MPI_Wait(&request, &status);

#else

    MPIO_Wait(&request, &status);

#endif

    MPI_File_close(&fh;;

    /* check if the data read is correct */

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

        if (buf[i] != (rank * 100000 + i)) {

            errs++;

            if (errs < 25) {

                fprintf(stderr, "Process %d: error, read %d, should be %d\n", rank, buf[i],

                        rank * 100000 + i);

            }

            else if (errs == 25) {

                fprintf(stderr, "Reached maximum number of errors to report\n");

            }

        }

    }

    free(buf);

    free(filename);

    MTest_Finalize(errs);

    MPI_Finalize();

    return 0;

}