.. _mpi_file_iread_all:


MPI_File_iread_all
==================

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:ref:`MPI_File_iread_all` |mdash| Reads a file starting at the location specified
by the individual file pointer (nonblocking, collective).

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.. include:: ./bindings/mpi_file_iread_all.rst

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

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

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

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

:ref:`MPI_File_iread_all` is a nonblocking version of :ref:`MPI_File_read_all`. It
attempts to read from the file associated with *fh* at the current
individual file pointer position maintained by the system in which a
total number of *count* data items having *datatype* type are read into
the user's buffer *buf.* The data is taken out of those parts of the
file specified by the current view. :ref:`MPI_File_iread_all` stores the number
of data-type elements actually read 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 opened.


ERRORS
------

.. include:: ./ERRORS.rst
