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

/*

 *

 *   Copyright (C) 1997 University of Chicago.

 *   See COPYRIGHT notice in top-level directory.

 */

#include "mpioimpl.h"

#ifdef HAVE_WEAK_SYMBOLS

#if defined(HAVE_PRAGMA_WEAK)

#pragma weak MPI_File_iread = PMPI_File_iread

#elif defined(HAVE_PRAGMA_HP_SEC_DEF)

#pragma _HP_SECONDARY_DEF PMPI_File_iread MPI_File_iread

#elif defined(HAVE_PRAGMA_CRI_DUP)

#pragma _CRI duplicate MPI_File_iread as PMPI_File_iread

/* end of weak pragmas */

#elif defined(HAVE_WEAK_ATTRIBUTE)

int MPI_File_iread(MPI_File fh, void *buf, int count, MPI_Datatype datatype, MPIO_Request * request)

    __attribute__ ((weak, alias("PMPI_File_iread")));

#endif

/* Include mapping from MPI->PMPI */

#define MPIO_BUILD_PROFILING

#include "mpioprof.h"

#endif

#ifdef HAVE_MPI_GREQUEST

#include "mpiu_greq.h"

#endif

/*@

    MPI_File_iread - Nonblocking read using individual file pointer

Input Parameters:

. fh - file handle (handle)

. count - number of elements in buffer (nonnegative integer)

. datatype - datatype of each buffer element (handle)

Output Parameters:

. buf - initial address of buffer (choice)

. request - request object (handle)

.N fortran

@*/

int MPI_File_iread(MPI_File fh, void *buf, int count, MPI_Datatype datatype, MPI_Request * request)

{

    int error_code = MPI_SUCCESS;

    static char myname[] = "MPI_FILE_IREAD";

#ifdef MPI_hpux

    int fl_xmpi;

    HPMP_IO_START(fl_xmpi, BLKMPIFILEIREAD, TRDTSYSTEM, fh, datatype, count);

#endif /* MPI_hpux */

    error_code = MPIOI_File_iread(fh, (MPI_Offset) 0, ADIO_INDIVIDUAL,

                                  buf, count, datatype, myname, request);

    /* --BEGIN ERROR HANDLING-- */

    if (error_code != MPI_SUCCESS)

        error_code = MPIO_Err_return_file(fh, error_code);

    /* --END ERROR HANDLING-- */

#ifdef MPI_hpux

    HPMP_IO_END(fl_xmpi, fh, datatype, count);

#endif /* MPI_hpux */

    return error_code;

}

/* prevent multiple definitions of this routine */

#ifdef MPIO_BUILD_PROFILING

int MPIOI_File_iread(MPI_File fh, MPI_Offset offset, int file_ptr_type, void *buf, int count,

                     MPI_Datatype datatype, char *myname, MPI_Request * request)

{

    int error_code, buftype_is_contig, filetype_is_contig;

    MPI_Count datatype_size;

    ADIO_Status status;

    ADIO_File adio_fh;

    ADIO_Offset off, bufsize;

    MPI_Offset nbytes = 0;

    ROMIO_THREAD_CS_ENTER();

    adio_fh = MPIO_File_resolve(fh);

    /* --BEGIN ERROR HANDLING-- */

    MPIO_CHECK_FILE_HANDLE(adio_fh, myname, error_code);

    MPIO_CHECK_COUNT(adio_fh, count, myname, error_code);

    MPIO_CHECK_DATATYPE(adio_fh, datatype, myname, error_code);

    if (file_ptr_type == ADIO_EXPLICIT_OFFSET && offset < 0) {

        error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,

                                          myname, __LINE__, MPI_ERR_ARG, "**iobadoffset", 0);

        error_code = MPIO_Err_return_file(adio_fh, error_code);

        goto fn_exit;

    }

    /* --END ERROR HANDLING-- */

    MPI_Type_size_x(datatype, &datatype_size);

    /* --BEGIN ERROR HANDLING-- */

    MPIO_CHECK_INTEGRAL_ETYPE(adio_fh, count, datatype_size, myname, error_code);

    MPIO_CHECK_READABLE(adio_fh, myname, error_code);

    MPIO_CHECK_NOT_SEQUENTIAL_MODE(adio_fh, myname, error_code);

    MPIO_CHECK_COUNT_SIZE(adio_fh, count, datatype_size, myname, error_code);

    /* --END ERROR HANDLING-- */

    ADIOI_Datatype_iscontig(datatype, &buftype_is_contig);

    ADIOI_Datatype_iscontig(adio_fh->filetype, &filetype_is_contig);

    ADIOI_TEST_DEFERRED(adio_fh, myname, &error_code);

    if (buftype_is_contig && filetype_is_contig) {

        /* convert count and offset to bytes */

        bufsize = datatype_size * count;

        if (file_ptr_type == ADIO_EXPLICIT_OFFSET) {

            off = adio_fh->disp + adio_fh->etype_size * offset;

        } else {

            off = adio_fh->fp_ind;

        }

        if (!(adio_fh->atomicity))

            ADIO_IreadContig(adio_fh, buf, count, datatype, file_ptr_type,

                             off, request, &error_code);

        else {

            /* to maintain strict atomicity semantics with other concurrent

             * operations, lock (exclusive) and call blocking routine */

            if (ADIO_Feature(adio_fh, ADIO_LOCKS)) {

                ADIOI_WRITE_LOCK(adio_fh, off, SEEK_SET, bufsize);

            }

            ADIO_ReadContig(adio_fh, buf, count, datatype, file_ptr_type,

                            off, &status, &error_code);

            if (ADIO_Feature(adio_fh, ADIO_LOCKS)) {

                ADIOI_UNLOCK(adio_fh, off, SEEK_SET, bufsize);

            }

            if (error_code == MPI_SUCCESS) {

                nbytes = count * datatype_size;

            }

            MPIO_Completed_request_create(&adio_fh, nbytes, &error_code, request);

        }

    } else

        ADIO_IreadStrided(adio_fh, buf, count, datatype, file_ptr_type,

                          offset, request, &error_code);

  fn_exit:

    ROMIO_THREAD_CS_EXIT();

    return error_code;

}

#endif