This feature should allow app to get cpg groups and members. It's
modeled like ckpt section iteration, so:
Data types:
/* Handle to cpg_iteration instance */
typedef uint64_t cpg_iteration_handle_t;
/* Type of iteration */
typedef enum {
CPG_ITERATION_NAME_ONLY = 1, /* We will return only group names,
and nodeid + pid will be set to 0*/
CPG_ITERATION_ONE_GROUP = 2, /* Return only members of one
specified group*/
CPG_ITERATION_ALL = 3, /* Return everything*/
} cpg_iteration_type_t;
/* Result of calling cpg_iteration_next */
struct cpg_iteration_description_t {
struct cpg_name group; /* Group name, always set */
uint32_t nodeid;
uint32_t pid;
};
Functions:
/* Initialize iteration. in case
iteration_type == CPG_ITERATION_ONE_GROUP -> group must be set,
otherwise it must be NULL.
*/
cs_error_t cpg_iteration_initialize(
cpg_handle_t handle,
cpg_iteration_type_t iteration_type,
const struct cpg_name *group,
cpg_iteration_handle_t *cpg_iteration_handle);
/* Return ONE cpg_iteration_description_t item*/
cs_error_t cpg_iteration_next(
cpg_iteration_handle_t handle,
struct cpg_iteration_description_t *description);
/* No comment */
cs_error_t cpg_iteration_finalize (
cpg_iteration_handle_t handle);
This scheme should be very scalable. In corosync service part, snapshot
of process_info is created in time of cpg_iteration_initialize call and
cpg_iteration_nex will return items from this snapshot. Snapshot is
"GROUPED BY" group_name so this should make displaying group with all
members easier, and reduce number of calls, because without this featur
it will mean to.
foreach grp_name in (get group names);do
foreach grp_member in (get group items in group grp_name);do
print grp_member_info
done
done
what is not only more ugly, but there can be potentially risk of delete
of group before displaying content.
One part, where I'm not so sure is cpg_iteration_type_t data type. It
can be:
- enum as it is
- or bit-field, with bits for NAME_ONLY and GROUP_SPECIFIED. This will
make fourth case (both bits set), which isn't very useful from practical
point of view, but it's possible (return name of group which user will
enter).
Comments (like better, more self-explaining names, ...) are highly welcomed.
Regards,
Honza
_______________________________________________
Openais mailing list
[email protected]
https://lists.linux-foundation.org/mailman/listinfo/openais
