Attach data to hg_bulk_t and hg_addr_t

[mdorier]

Is your feature request related to a problem? Please describe.

In Margo we use HG_Set/Get_data to attach data to hg_handle_t handles (typically we attach the margo_instance_id that was used to create the handle, along with some other information). A similar mechanism for hg_bulk_t and hg_addr_t would be really useful.

Describe the solution you'd like

hg_return_t HG_Bulk_set_data(hg_bulk_t handle, void *data, void (*free_callback)(void *));
void * HG_Bulk_get_data(hg_bulk_t handle);

hg_return_t HG_Addr_set_data(hg_addr_t handle, void *data, void (*free_callback)(void *));
void * HG_Addr_get_data(hg_addr_t handle);

[soumagne]

Yes I think I agree and that would prevent you for example from re-implementing another hash table or something similar to retrieve whatever you need to associate to the addr / bulk.