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.. _mpi_file_read_at_all:
MPI_File_read_at_all
====================
.. include_body
:ref:`MPI_File_read_at_all` |mdash| Reads a file at explicitly specified offsets
(blocking, collective).
SYNTAX
------
C Syntax
^^^^^^^^
.. code-block:: c
#include <mpi.h>
int MPI_File_read_at_all(MPI_File fh, MPI_Offset offset,
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_AT_ALL(FH, OFFSET, BUF, COUNT,
DATATYPE, STATUS, IERROR)
<type> BUF(*)
INTEGER FH, COUNT, DATATYPE, STATUS(MPI_STATUS_SIZE), IERROR
INTEGER(KIND=MPI_OFFSET_KIND) OFFSET
Fortran 2008 Syntax
^^^^^^^^^^^^^^^^^^^
.. code-block:: fortran
USE mpi_f08
MPI_File_read_at_all(fh, offset, buf, count, datatype, status, ierror)
TYPE(MPI_File), INTENT(IN) :: fh
INTEGER(KIND=MPI_OFFSET_KIND), INTENT(IN) :: offset
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).
* ``offset``: File offset (integer).
* ``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_at_all` is a collective 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_read_at_all` stores the number of *datatype* 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
|
