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MPI_Info_get_nthkey(3OpenMPI)                                                  MPI_Info_get_nthkey(3OpenMPI)



NAME
       MPI_Info_get_nthkey - Returns the nth defined key in info.


SYNTAX
C Syntax
       #include <mpi.h>
       int MPI_Info_get_nthkey(MPI_Info info, int n, char *key)


Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_INFO_GET_NTHKEY(INFO, N, KEY, IERROR)
            INTEGER        INFO, N, IERROR
            CHARACTER*(*)  KEY


C++ Syntax
       #include <mpi.h>
       void MPI::Info::Get_nthkey(int n, char* key) const


INPUT PARAMETERS
       info      Info object (handle).

       n         Key number (integer).


OUTPUT PARAMETERS
       key       Key (string).

       IERROR    Fortran only: Error status (integer).


DESCRIPTION
       MPI_Info_get_nthkey  returns  the nth defined key in info. Keys are numbered 0...N - 1 where N is the
       value returned by MPI_Info_get_nkeys. All keys between 0 and N - 1 are guaranteed to be defined.  The
       number  of  a  given  key  does  not  change  as  long  as  info is not modified with MPI_Info_set or
       MPI_Info_delete.


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_Info_get
       MPI_Info_get_nkeys
       MPI_Info_get_valueln




Open MPI 1.2                                   September 2006                  MPI_Info_get_nthkey(3OpenMPI)