Callback Functions

• What about the extra arguments passed to MPI_Keyval_create()?

MPI_Keyval_create( MPI_DUP_FN,

MPI_NULL_DELETE_FN,

&IO_KEY,

extra_arg);

int MPI_Keyval_create( MPI_Copy_function *copy_fct,

MPI_Delete_function *delete_fct,

int *keyval,

void *extra_arg);

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