+
+int smpi_comm_keyval_create(MPI_Comm_copy_attr_function* copy_fn, MPI_Comm_delete_attr_function* delete_fn, int* keyval, void* extra_state);
+int smpi_comm_keyval_free(int* keyval);
+int smpi_comm_attr_delete(MPI_Comm comm, int keyval);
+int smpi_comm_attr_get(MPI_Comm comm, int keyval, void* attr_value, int* flag);
+int smpi_comm_attr_put(MPI_Comm comm, int keyval, void* attr_value);
+int smpi_type_attr_delete(MPI_Datatype type, int keyval);
+int smpi_type_attr_get(MPI_Datatype type, int keyval, void* attr_value, int* flag);
+int smpi_type_attr_put(MPI_Datatype type, int keyval, void* attr_value);
+int smpi_type_keyval_create(MPI_Type_copy_attr_function* copy_fn, MPI_Type_delete_attr_function* delete_fn, int* keyval, void* extra_state);
+int smpi_type_keyval_free(int* keyval);