Here is a list of all documented struct and union fields with links to the struct/union documentation for each field:

this_shm : em_shm_t
thread_per_core : em_conf_t
tmo : event_hdr
tmo_type : event_hdr
to_active_hook : em_idle_hooks_t
to_active_hook_storage : em_shm_t
to_active_hook_tbl : em_shm_t
to_idle_hook : em_idle_hooks_t
to_idle_hook_storage : em_shm_t
to_idle_hook_tbl : em_shm_t
total_ops : em_pool_stats_opt_t , em_pool_subpool_stats_selected_t , em_pool_subpool_stats_t
type : queue_elem_t