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.. _mpi_file_read_all:
MPI_File_read_all
=================
.. include_body
:ref:`MPI_File_read_all` |mdash| Reads a file starting at the locations specified
by individual file pointers (blocking, collective).
SYNTAX
------
C Syntax
^^^^^^^^
.. code-block:: c
#include <mpi.h>
int MPI_File_read_all(MPI_File fh, void *buf,
int count, MPI_Datatype datatype, MPI_Status *status)
Fortran Syntax
^^^^^^^^^^^^^^
.. code-block:: fortran
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_FILE_READ_ALL(FH, BUF, COUNT,
DATATYPE, STATUS, IERROR)
<type> BUF(*)
INTEGER FH, COUNT, DATATYPE, STATUS(MPI_STATUS_SIZE),IERROR
Fortran 2008 Syntax
^^^^^^^^^^^^^^^^^^^
.. code-block:: fortran
USE mpi_f08
MPI_File_read_all(fh, buf, count, datatype, status, ierror)
TYPE(MPI_File), INTENT(IN) :: fh
TYPE(*), DIMENSION(..) :: buf
INTEGER, INTENT(IN) :: count
TYPE(MPI_Datatype), INTENT(IN) :: datatype
TYPE(MPI_Status) :: status
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
INPUT PARAMETERS
----------------
* ``fh``: File handle (handle).
* ``count``: Number of elements in buffer (integer).
* ``datatype``: Data type of each buffer element (handle).
OUTPUT PARAMETERS
-----------------
* ``buf``: Initial address of buffer (choice).
* ``status``: Status object (status).
* ``ierror``: Fortran only: Error status (integer).
DESCRIPTION
-----------
:ref:`MPI_File_read_all` is a collective routine that attempts to read from 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 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_read_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
|
