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.. _mpi_file_set_atomicity:
MPI_File_set_atomicity
======================
.. include_body
:ref:`MPI_File_set_atomicity` |mdash| Sets consistency semantics for data-access
operations (collective).
SYNTAX
------
C Syntax
^^^^^^^^
.. code-block:: c
#include <mpi.h>
int MPI_File_set_atomicity(MPI_File fh, int flag)
Fortran Syntax
^^^^^^^^^^^^^^
.. code-block:: fortran
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_FILE_SET_ATOMICITY(FH, FLAG, IERROR)
INTEGER FH, FLAG, IERROR
Fortran 2008 Syntax
^^^^^^^^^^^^^^^^^^^
.. code-block:: fortran
USE mpi_f08
MPI_File_set_atomicity(fh, flag, ierror)
TYPE(MPI_File), INTENT(IN) :: fh
LOGICAL, INTENT(IN) :: flag
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
INPUT PARAMETERS
----------------
* ``fh``: File handle (handle).
* ``flag``: **true** to enable atomic mode, **false** to enable nonatomic mode (boolean).
OUTPUT PARAMETER
----------------
* ``ierror``: Fortran only: Error status (integer).
DESCRIPTION
-----------
The consistency semantics for data-access operations using the set of
file handles created by one collective :ref:`MPI_File_open` is set by
collectively calling :ref:`MPI_File_set_atomicity`. All processes in the group
must pass identical values for *fh* and *flag.* If *flag* is *true,*
atomic mode is set; if *flag* is *false,* nonatomic mode is set.
The default value on a call to :ref:`MPI_File_open` in Open MPI is *true* for
jobs running on more than one node, *false* for jobs running on a single
SMP. For more information, see the MPI-2 standard.
ERRORS
------
.. include:: ./ERRORS.rst
|
