.. _mpi_file_write_at_all_begin:


MPI_File_write_at_all_begin
===========================

.. include_body

:ref:`MPI_File_write_at_all_begin` |mdash| Writes a file at explicitly specified
offsets; beginning part of a split collective routine (nonblocking).

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.. include:: ./bindings/mpi_file_write_at_all_begin.rst

INPUT/OUTPUT PARAMETER
----------------------
* ``fh``: File handle (handle).

INPUT PARAMETERS
----------------
* ``offset``: File offset (handle).
* ``buf``: Initial address of buffer (choice).
* ``count``: Number of elements in buffer (integer).
* ``datatype``: Data type of each buffer element (handle).

OUTPUT PARAMETER
----------------
* ``ierror``: Fortran only: Error status (integer).

DESCRIPTION
-----------

:ref:`MPI_File_write_at_all_begin` is the beginning part of a split collective,
that is, a nonblocking routine that attempts to write into the file
associated with *fh* (at the *offset* position) a total number of
*count* data items having *datatype* type from the user's buffer *buf.*
The offset is in etype units relative to the current view. That is,
holes are not counted when locating an offset. The data is written into
those parts of the file specified by the current view.


NOTES
-----

All the nonblocking collective routines for data access are "split" into
two routines, each with ``_begin`` or ``_end`` as a suffix. These split
collective routines are subject to the semantic rules described in
Section 9.4.5 of the MPI-2 standard.


ERRORS
------

.. include:: ./ERRORS.rst