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MPI_Info_get_nthkey - Returns the nth defined key in info.
#include <mpi.h>
int MPI_Info_get_nthkey(MPI_Info info, int n, char *key)
USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_INFO_GET_NTHKEY(INFO, N, KEY, IERROR)
INTEGER INFO, N, IERROR
CHARACTER*(*) KEY
USE mpi_f08
MPI_Info_get_nthkey(info, n, key, ierror)
TYPE(MPI_Info), INTENT(IN) :: info
INTEGER, INTENT(IN) :: n
CHARACTER(LEN=*), INTENT(OUT) :: key
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
- info
- Info object (handle).
- n
- Key number (integer).
- key
- Key (string).
- IERROR
- Fortran only: Error status (integer).
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.
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_Info_get
MPI_Info_get_nkeys
MPI_Info_get_valuelen
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