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.. _mpi_initialized:
MPI_Initialized
===============
.. include_body
:ref:`MPI_Initialized` |mdash| Checks whether MPI has been initialized
SYNTAX
------
C Syntax
^^^^^^^^
.. code-block:: c
#include <mpi.h>
int MPI_Initialized(int *flag)
Fortran Syntax
^^^^^^^^^^^^^^
.. code-block:: fortran
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_INITIALIZED(FLAG, IERROR)
LOGICAL FLAG
INTEGER IERROR
Fortran 2008 Syntax
^^^^^^^^^^^^^^^^^^^
.. code-block:: fortran
USE mpi_f08
MPI_Initialized(flag, ierror)
LOGICAL, INTENT(OUT) :: flag
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
OUTPUT PARAMETERS
-----------------
* ``flag``: True if MPI has been initialized, and false otherwise (logical).
* ``ierror``: Fortran only: Error status (integer).
DESCRIPTION
-----------
This routine may be used to determine whether MPI has been initialized.
It is one of a small number of routines that may be called before MPI is
initialized and after MPI has been finalized (:ref:`MPI_Finalized` is another).
ERRORS
------
.. include:: ./ERRORS.rst
.. seealso::
* :ref:`MPI_Init`
* :ref:`MPI_Init_thread`
* :ref:`MPI_Finalize`
* :ref:`MPI_Finalized`
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