/* -*- 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 = PMPI_File_write
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_File_write MPI_File_write
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_File_write as PMPI_File_write
/* end of weak pragmas */
#elif defined(HAVE_WEAK_ATTRIBUTE)
int MPI_File_write(MPI_File fh, const void *buf, int count, MPI_Datatype datatype,
                   MPI_Status *status) __attribute__((weak,alias("PMPI_File_write")));
#endif

/* Include mapping from MPI->PMPI */
#define MPIO_BUILD_PROFILING
#include "mpioprof.h"
#endif

/* status object not filled currently */

/*@
    MPI_File_write - Write using individual 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(MPI_File fh, ROMIO_CONST void *buf, int count,
                   MPI_Datatype datatype, MPI_Status *status)
{
    int error_code;
    static char myname[] = "MPI_FILE_WRITE";
#ifdef MPI_hpux
    int fl_xmpi;

    HPMP_IO_START(fl_xmpi, BLKMPIFILEWRITE, TRDTBLOCK, fh, datatype, count);
#endif /* MPI_hpux */

    error_code = MPIOI_File_write(fh, (MPI_Offset) 0, ADIO_INDIVIDUAL, buf,
				  count, datatype, myname, status);

#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_write(MPI_File fh,
		     MPI_Offset offset,
		     int file_ptr_type,
		     const void *buf,
		     int count,
		     MPI_Datatype datatype,
		     char *myname,
		     MPI_Status *status)
{
    int error_code, buftype_is_contig, filetype_is_contig;
    MPI_Count datatype_size;
    ADIO_Offset off, bufsize;
    ADIO_File adio_fh;
    void *e32buf=NULL;
    const void *xbuf=NULL;

    MPIU_THREAD_CS_ENTER(ALLFUNC,);

    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_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_WRITABLE(adio_fh, myname, error_code);
    MPIO_CHECK_NOT_SEQUENTIAL_MODE(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);

    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 bufcount 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 /* ADIO_INDIVIDUAL */ {
	    off = adio_fh->fp_ind;
	}

        /* if atomic mode requested, lock (exclusive) the region, because
           there could be a concurrent noncontiguous request. Locking doesn't
           work on PIOFS and PVFS, and on NFS it is done in the
           ADIO_WriteContig.
	 */

        if ((adio_fh->atomicity) && ADIO_Feature(adio_fh, ADIO_LOCKS))
	{
            ADIOI_WRITE_LOCK(adio_fh, off, SEEK_SET, bufsize);
	}

	ADIO_WriteContig(adio_fh, xbuf, count, datatype, file_ptr_type,
		     off, status, &error_code);

        if ((adio_fh->atomicity) && ADIO_Feature(adio_fh, ADIO_LOCKS))
	{
            ADIOI_UNLOCK(adio_fh, off, SEEK_SET, bufsize);
	}
    }
    else
    {
	/* For strided and atomic mode, locking is done in ADIO_WriteStrided */
	ADIO_WriteStrided(adio_fh, xbuf, count, datatype, file_ptr_type,
			  offset, status, &error_code);
    }


    /* --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);
    MPIU_THREAD_CS_EXIT(ALLFUNC,);

    return error_code;
}
#endif
