/* -*- 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_iwrite_shared = PMPI_File_iwrite_shared

#elif defined(HAVE_PRAGMA_HP_SEC_DEF)

#pragma _HP_SECONDARY_DEF PMPI_File_iwrite_shared MPI_File_iwrite_shared

#elif defined(HAVE_PRAGMA_CRI_DUP)

#pragma _CRI duplicate MPI_File_iwrite_shared as PMPI_File_iwrite_shared

/* end of weak pragmas */

#elif defined(HAVE_WEAK_ATTRIBUTE)

int MPI_File_iwrite_shared(MPI_File fh, const void *buf, int count, MPI_Datatype datatype,

                           MPIO_Request * request)

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

#endif

/* Include mapping from MPI->PMPI */

#define MPIO_BUILD_PROFILING

#include "mpioprof.h"

#endif

/*@

    MPI_File_iwrite_shared - Nonblocking write using shared file pointer

Input Parameters:

. fh - file handle (handle)

. buf - initial address of buffer (choice)

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

. datatype - datatype of each buffer element (handle)

Output Parameters:

. request - request object (handle)

.N fortran

@*/

#ifdef HAVE_MPI_GREQUEST

#include "mpiu_greq.h"

#endif

int MPI_File_iwrite_shared(MPI_File fh, ROMIO_CONST void *buf, int count,

                           MPI_Datatype datatype, MPIO_Request * request)

{

    int error_code, buftype_is_contig, filetype_is_contig;

    ADIO_File adio_fh;

    ADIO_Offset incr, bufsize;

    MPI_Count datatype_size;

    ADIO_Status status;

    ADIO_Offset off, shared_fp;

    static char myname[] = "MPI_FILE_IWRITE_SHARED";

    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);

    /* --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_FS_SUPPORTS_SHARED(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);

    incr = (count * datatype_size) / adio_fh->etype_size;

    ADIO_Get_shared_fp(adio_fh, incr, &shared_fp, &error_code);

    if (error_code != MPI_SUCCESS) {

        /* note: ADIO_Get_shared_fp should have set up error code already? */

        MPIO_Err_return_file(adio_fh, error_code);

    }

    /* contiguous or strided? */

    if (buftype_is_contig && filetype_is_contig) {

        /* convert sizes to bytes */

        bufsize = datatype_size * count;

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

        if (!(adio_fh->atomicity))

            ADIO_IwriteContig(adio_fh, buf, count, datatype, ADIO_EXPLICIT_OFFSET,

                              off, request, &error_code);

        else {

            /* to maintain strict atomicity semantics with other concurrent

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

            if (adio_fh->file_system != ADIO_NFS)

                ADIOI_WRITE_LOCK(adio_fh, off, SEEK_SET, bufsize);

            ADIO_WriteContig(adio_fh, buf, count, datatype, ADIO_EXPLICIT_OFFSET,

                             off, &status, &error_code);

            if (adio_fh->file_system != ADIO_NFS)

                ADIOI_UNLOCK(adio_fh, off, SEEK_SET, bufsize);

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

        }

    } else

        ADIO_IwriteStrided(adio_fh, buf, count, datatype, ADIO_EXPLICIT_OFFSET,

                           shared_fp, request, &error_code);

  fn_exit:

    ROMIO_THREAD_CS_EXIT();

    return error_code;

}