NAME

       MPI_Initialized - Indicates whether MPI_Init has been called.

SYNTAX

C Syntax

       #include <mpi.h>
       int MPI_Initialized(int *flag)

Fortran Syntax

       INCLUDE 'mpif.h'
       MPI_INITIALIZED(FLAG, IERROR)
            LOGICAL   FLAG
            INTEGER   IERROR

C++ Syntax

       #include <mpi.h>
       bool Is_initialized()

OUTPUT PARAMETERS

       flag      Flag is true if MPI_Init has been called and false otherwise.

       IERROR    Fortran only: Error status (integer).

DESCRIPTION

       This  routine  may  be  used to determine whether MPI_Init has been called. It is the only
       routine that may be called before MPI_Init is called.

ERRORS

       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.

SEE ALSO

       MPI_Init