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.. _mpi_file_iwrite:
MPI_File_iwrite
===============
.. include_body
:ref:`MPI_File_iwrite` |mdash| Writes a file starting at the location specified
by the individual file pointer (nonblocking, noncollective).
SYNTAX
------
C Syntax
^^^^^^^^
.. code-block:: c
#include <mpi.h>
int MPI_File_iwrite(MPI_File fh, const void *buf, int count,
MPI_Datatype datatype, MPI_Request *request)
Fortran Syntax
^^^^^^^^^^^^^^
.. code-block:: fortran
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_FILE_IWRITE(FH, BUF, COUNT, DATATYPE, REQUEST, IERROR)
<type> BUF(*)
INTEGER FH, COUNT, DATATYPE, REQUEST, IERROR
Fortran 2008 Syntax
^^^^^^^^^^^^^^^^^^^
.. code-block:: fortran
USE mpi_f08
MPI_File_iwrite(fh, buf, count, datatype, request, ierror)
TYPE(MPI_File), INTENT(IN) :: fh
TYPE(*), DIMENSION(..), INTENT(IN), ASYNCHRONOUS :: buf
INTEGER, INTENT(IN) :: count
TYPE(MPI_Datatype), INTENT(IN) :: datatype
TYPE(MPI_Request), INTENT(OUT) :: request
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
INPUT/OUTPUT PARAMETER
----------------------
* ``fh``: File handle (handle).
INPUT PARAMETERS
----------------
* ``buf``: Initial address of buffer (choice).
* ``count``: Number of elements in buffer (integer).
* ``datatype``: Data type of each buffer element (handle).
OUTPUT PARAMETER
----------------
* ``request``: Request object (handle).
* ``ierror``: Fortran only: Error status (integer).
DESCRIPTION
-----------
:ref:`MPI_File_iwrite` is a nonblocking version of the :ref:`MPI_File_write`
interface. It attempts to write into the file associated with *fh* (at
the current individual file pointer position maintained by the system) a
total number of *count* data items having *datatype* type from the
user's buffer *buf.* The data is written into those parts of the file
specified by the current view. :ref:`MPI_File_iwrite` stores the number of
*datatype* elements actually written in *status.* All other fields of
*status* are undefined.
It is erroneous to call this function if ``MPI_MODE_SEQUENTIAL`` mode was
specified when the file was open.
ERRORS
------
.. include:: ./ERRORS.rst
|
