static int tcp_wait_for_events(tcp_context_t *tcp)
{
/* Wait for events. */
fdset_t *set = &tcp->set;
int nfds = poll(set->pfd, set->n, TCP_SWEEP_INTERVAL * 1000);
/* Mark the time of last poll call. */
time_now(&tcp->last_poll_time);
bool is_throttled = (tcp->last_poll_time.tv_sec < tcp->throttle_end.tv_sec);
if (!is_throttled) {
/* Configuration limit, infer maximal pool size. */
rcu_read_lock();
conf_val_t *val = &conf()->cache.srv_max_tcp_clients;
unsigned max_per_set = MAX(conf_int(val) / conf_tcp_threads(conf()), 1);
rcu_read_unlock();
/* Subtract master sockets check limits. */
is_throttled = (set->n - tcp->client_threshold) >= max_per_set;
}
/* Process events. */
unsigned i = 0;
while (nfds > 0 && i < set->n) {
bool should_close = false;
int fd = set->pfd[i].fd;
if (set->pfd[i].revents & (POLLERR|POLLHUP|POLLNVAL)) {
should_close = (i >= tcp->client_threshold);
--nfds;
} else if (set->pfd[i].revents & (POLLIN)) {
/* Master sockets */
if (i < tcp->client_threshold) {
if (!is_throttled && tcp_event_accept(tcp, i) == KNOT_EBUSY) {
time_now(&tcp->throttle_end);
tcp->throttle_end.tv_sec += tcp_throttle();
}
/* Client sockets */
} else {
if (tcp_event_serve(tcp, i) != KNOT_EOK) {
should_close = true;
}
}
--nfds;
}
/* Evaluate */
if (should_close) {
fdset_remove(set, i);
close(fd);
} else {
++i;
}
}
return nfds;
}
static int tcp_wait_for_events(tcp_context_t *tcp)
{
/* Wait for events. */
fdset_t *set = &tcp->set;
int nfds = poll(set->pfd, set->n, TCP_SWEEP_INTERVAL * 1000);
/* Mark the time of last poll call. */
time_now(&tcp->last_poll_time);
/* Process events. */
unsigned i = 0;
while (nfds > 0 && i < set->n) {
/* Terminate faulty connections. */
int fd = set->pfd[i].fd;
/* Active sockets. */
if (set->pfd[i].revents & POLLIN) {
--nfds; /* One less active event. */
/* Indexes <0, client_threshold) are master sockets. */
if (i < tcp->client_threshold) {
/* Faulty master sockets shall be sorted later. */
(void) tcp_event_accept(tcp, i);
} else {
if (tcp_event_serve(tcp, i) != KNOT_EOK) {
fdset_remove(set, i);
close(fd);
continue; /* Stay on the same index. */
}
}
}
if (set->pfd[i].revents & (POLLERR|POLLHUP|POLLNVAL)) {
--nfds; /* One less active event. */
fdset_remove(set, i);
close(fd);
continue; /* Stay on the same index. */
}
/* Next socket. */
++i;
}
return nfds;
}