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MPI_Initialized - Checks whether MPI has been initialized
#include <mpi.h>
int MPI_Initialized(int *flag)
USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_INITIALIZED(FLAG, IERROR)
LOGICAL FLAG
INTEGER IERROR
USE mpi_f08
MPI_Initialized(flag, ierror)
LOGICAL, INTENT(OUT) :: flag
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
- flag
- True if MPI has been initialized, and false otherwise
(logical).
- IERROR
- Fortran only: Error status (integer).
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 (MPI_Finalized is another).
Almost
all MPI routines return an error value; C routines as the value of the
function and Fortran routines in the last argument. C++ functions do not
return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS,
then on error the C++ exception mechanism will be used to throw an MPI::Exception
object.
Before the error value is returned, the current MPI error handler
is called. By default, this error handler aborts the MPI job, except for
I/O function errors. The error handler may be changed with MPI_Comm_set_errhandler;
the predefined error handler MPI_ERRORS_RETURN may be used to cause error
values to be returned. Note that MPI does not guarantee that an MPI program
can continue past an error.
MPI_Init
MPI_Init_thread
MPI_Finalize
MPI_Finalized
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