.. _mpi_file_iread_at_all:


MPI_File_iread_at_all
=====================

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:ref:`MPI_File_iread_at_all` |mdash| Reads a file at an explicitly specified
offset (nonblocking, collective).

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.. include:: ./bindings/mpi_file_iread_at_all.rst

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

OUTPUT PARAMETERS
-----------------
* ``buf``: Initial address of the buffer (choice).
* ``request``: Request object (handle).
* ``ierror``: Fortran only: Error status (integer).

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

:ref:`MPI_File_iread_at_all` is the nonblocking version of
:ref:`MPI_File_read_at_all`.

:ref:`MPI_File_iread_at_all` is a nonblocking routine that attempts to read
from the file associated with *fh* at the *offset* position a total
number of *count* data items having *datatype* type into 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 taken out of those parts of the file specified by the current view.
:ref:`MPI_File_iread_at_all` stores the number of *datatype* elements actually
read in *status.* All other fields of *status* are undefined.


ERRORS
------

.. include:: ./ERRORS.rst