/* -*- 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_write_shared = PMPI_File_write_shared

#elif defined(HAVE_PRAGMA_HP_SEC_DEF)

#pragma _HP_SECONDARY_DEF PMPI_File_write_shared MPI_File_write_shared

#elif defined(HAVE_PRAGMA_CRI_DUP)

#pragma _CRI duplicate MPI_File_write_shared as PMPI_File_write_shared

/* end of weak pragmas */

#elif defined(HAVE_WEAK_ATTRIBUTE)

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

                          MPI_Status * status)

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

#endif

/* Include mapping from MPI->PMPI */

#define MPIO_BUILD_PROFILING

#include "mpioprof.h"

#endif

/* status object not filled currently */

/*@

    MPI_File_write_shared - 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:

. status - status object (Status)

.N fortran

@*/

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

                          MPI_Datatype datatype, MPI_Status * status)

{

    int error_code, buftype_is_contig, filetype_is_contig;

    ADIO_Offset bufsize;

    static char myname[] = "MPI_FILE_READ_SHARED";

    MPI_Count datatype_size, incr;

    ADIO_Offset off, shared_fp;

    ADIO_File adio_fh;

    void *e32buf = NULL;

    const void *xbuf = NULL;

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

    /* --END ERROR HANDLING-- */

    if (count * datatype_size == 0) {

#ifdef HAVE_STATUS_SET_BYTES

        MPIR_Status_set_bytes(status, datatype, 0);

#endif

        error_code = MPI_SUCCESS;

        goto fn_exit;

    }

    /* --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);

    /* --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);

    /* --BEGIN ERROR HANDLING-- */

    if (error_code != MPI_SUCCESS) {

        error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_FATAL,

                                          myname, __LINE__, MPI_ERR_INTERN, "**iosharedfailed", 0);

        error_code = MPIO_Err_return_file(adio_fh, error_code);

        goto fn_exit;

    }

    /* --END ERROR HANDLING-- */

    xbuf = buf;

    if (adio_fh->is_external32) {

        error_code = MPIU_external32_buffer_setup(buf, count, datatype, &e32buf);

        if (error_code != MPI_SUCCESS)

            goto fn_exit;

        xbuf = e32buf;

    }

    if (buftype_is_contig && filetype_is_contig) {

        /* convert bufocunt and shared_fp to bytes */

        bufsize = datatype_size * count;

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

        /* if atomic mode requested, lock (exclusive) the region, because there

         * could be a concurrent noncontiguous request. On NFS, locking is

         * done in the ADIO_WriteContig. */

        if ((adio_fh->atomicity) && (adio_fh->file_system != ADIO_NFS))

            ADIOI_WRITE_LOCK(adio_fh, off, SEEK_SET, bufsize);

        ADIO_WriteContig(adio_fh, xbuf, count, datatype, ADIO_EXPLICIT_OFFSET,

                         off, status, &error_code);

        if ((adio_fh->atomicity) && (adio_fh->file_system != ADIO_NFS))

            ADIOI_UNLOCK(adio_fh, off, SEEK_SET, bufsize);

    } else {

        ADIO_WriteStrided(adio_fh, xbuf, count, datatype, ADIO_EXPLICIT_OFFSET,

                          shared_fp, status, &error_code);

        /* For strided and atomic mode, locking is done in ADIO_WriteStrided */

    }

    /* --BEGIN ERROR HANDLING-- */

    if (error_code != MPI_SUCCESS)

        error_code = MPIO_Err_return_file(adio_fh, error_code);

    /* --END ERROR HANDLING-- */

  fn_exit:

    if (e32buf != NULL)

        ADIOI_Free(e32buf);

    ROMIO_THREAD_CS_EXIT();

    return error_code;

}