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MPI_Initialized(3) man page (version 1.10.1)

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MPI_Initialized - Indicates whether MPI_Init has been called.


C Syntax

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

Fortran Syntax

INCLUDE ’mpif.h’

C++ Syntax

#include <mpi.h>
bool Is_initialized()

Output Parameters

Flag is true if MPI_Init has been called and false otherwise.
Fortran only: Error status (integer).


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.


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


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