/* Iterate through all the event lists (such as connect_events, read_events, * timer_events, etc) and take action for those that have completed (due to * timeout, i/o, etc) */ void iterate_through_event_lists(struct npool *nsp) { gh_lnode_t *current, *next, *last; last = gh_list_last_elem(&nsp->active_iods); for (current = gh_list_first_elem(&nsp->active_iods); current != NULL && gh_lnode_prev(current) != last; current = next) { struct niod *nsi = container_of(current, struct niod, nodeq); process_iod_events(nsp, nsi, get_evmask(nsp, nsi)); next = gh_lnode_next(current); if (nsi->state == NSIOD_STATE_DELETED) { gh_list_remove(&nsp->active_iods, current); gh_list_prepend(&nsp->free_iods, current); } } /* iterate through timers and expired events */ process_expired_events(nsp); }
void process_iod_events(struct npool *nsp, struct niod *nsi, int ev) { int i = 0; /* store addresses of the pointers to the first elements of each kind instead * of storing the values, as a connect can add a read for instance */ gh_lnode_t **start_elems[] = { &nsi->first_connect, &nsi->first_read, &nsi->first_write, #if HAVE_PCAP &nsi->first_pcap_read, #endif NULL }; gh_list_t *evlists[] = { &nsp->connect_events, &nsp->read_events, &nsp->write_events, #if HAVE_PCAP &nsp->pcap_read_events, #endif NULL }; assert(nsp == nsi->nsp); nsock_log_debug_all("Processing events on IOD %lu (ev=%d)", nsi->id, ev); /* We keep the events separate because we want to handle them in the * order: connect => read => write => timer for several reasons: * * 1) Makes sure we have gone through all the net i/o events before * a timer expires (would be a shame to timeout after the data was * available but before we delivered the events * * 2) The connect() results often lead to a read or write that can be * processed in the same cycle. In the same way, read() often * leads to write(). */ for (i = 0; evlists[i] != NULL; i++) { gh_lnode_t *current, *next, *last; /* for each list, get the last event and don't look past it as an event * could add another event in the same list and so on... */ last = gh_list_last_elem(evlists[i]); for (current = *start_elems[i]; current != NULL && gh_lnode_prev(current) != last; current = next) { struct nevent *nse; #if HAVE_PCAP if (evlists[i] == &nsi->nsp->pcap_read_events) nse = lnode_nevent2(current); else #endif nse = lnode_nevent(current); /* events are grouped by IOD. Break if we're done with the events for the * current IOD */ if (nse->iod != nsi) break; process_event(nsp, evlists[i], nse, ev); next = gh_lnode_next(current); if (nse->event_done) { /* event is done, remove it from the event list and update IOD pointers * to the first events of each kind */ update_first_events(nse); gh_list_remove(evlists[i], current); gh_list_append(&nsp->free_events, &nse->nodeq_io); if (nse->timeout.tv_sec) gh_heap_remove(&nsp->expirables, &nse->expire); } } } }