8 #include <talloc/talloc.h>
24 struct timeval timeout;
30 struct list_item list;
34 struct waiter **waiters;
38 struct timeval next_timeout;
40 /* These are kept consistent over each call to waiter_poll, as
41 * set->waiters may be updated (by waiters' callbacks calling
42 * waiter_register or waiter_remove) during iteration. */
43 struct pollfd *pollfds;
45 struct waiter **io_waiters;
47 struct waiter **time_waiters;
50 struct list free_list;
53 struct waitset *waitset_create(void *ctx)
55 struct waitset *set = talloc_zero(ctx, struct waitset);
56 list_init(&set->free_list);
60 static struct waiter *waiter_new(struct waitset *set)
62 struct waiter **waiters, *waiter;
64 waiter = talloc(set, struct waiter);
68 waiters = talloc_realloc(set, set->waiters,
69 struct waiter *, set->n_waiters + 1);
76 set->waiters_changed = true;
77 set->waiters = waiters;
80 set->waiters[set->n_waiters - 1] = waiter;
81 waiter->active = true;
85 struct waiter *waiter_register_io(struct waitset *set, int fd, int events,
86 waiter_cb callback, void *arg)
88 struct waiter *waiter = waiter_new(set);
90 waiter->type = WAITER_IO;
93 waiter->io.events = events;
94 waiter->callback = callback;
100 struct waiter *waiter_register_timeout(struct waitset *set, int delay_ms,
101 waiter_cb callback, void *arg)
103 struct waiter *waiter = waiter_new(set);
104 struct timeval now, delay;
106 delay.tv_sec = delay_ms / 1000;
107 delay.tv_usec = 1000 * (delay_ms % 1000);
109 gettimeofday(&now, NULL);
111 timeradd(&now, &delay, &waiter->timeout);
113 waiter->type = WAITER_TIME;
115 waiter->callback = callback;
121 void waiter_remove(struct waiter *waiter)
123 struct waitset *set = waiter->set;
126 for (i = 0; i < set->n_waiters; i++)
127 if (set->waiters[i] == waiter)
130 assert(i < set->n_waiters);
133 memmove(&set->waiters[i], &set->waiters[i+1],
134 (set->n_waiters - i) * sizeof(set->waiters[0]));
136 set->waiters = talloc_realloc(set, set->waiters,
137 struct waiter *, set->n_waiters);
138 set->waiters_changed = true;
140 waiter->active = false;
141 list_add(&set->free_list, &waiter->list);
144 static void update_waiters(struct waitset *set)
146 int n_io, n_time, i_io, i_time, i;
148 if (!set->waiters_changed)
153 for (i = 0; i < set->n_waiters; i++) {
154 if (set->waiters[i]->type == WAITER_IO)
156 else if (set->waiters[i]->type == WAITER_TIME)
160 /* realloc if counts have changed */
161 if (set->n_io_waiters != n_io) {
162 set->io_waiters = talloc_realloc(set, set->io_waiters,
163 struct waiter *, n_io);
164 set->pollfds = talloc_realloc(set, set->pollfds,
165 struct pollfd, n_io);
166 set->n_io_waiters = n_io;
168 if (set->n_time_waiters != n_time) {
169 set->time_waiters = talloc_realloc(set, set->time_waiters,
170 struct waiter *, n_time);
171 set->n_time_waiters = n_time;
177 timerclear(&set->next_timeout);
179 for (i = 0; i < set->n_waiters; i++) {
180 struct waiter *waiter = set->waiters[i];
182 /* IO waiters: copy to io_waiters, populate pollfds */
183 if (waiter->type == WAITER_IO) {
184 set->pollfds[i_io].fd = waiter->io.fd;
185 set->pollfds[i_io].events = waiter->io.events;
186 set->io_waiters[i_io] = waiter;
190 /* time waiters: copy to time_waiters, calculate next expiry */
191 if (waiter->type == WAITER_TIME) {
192 if (!timerisset(&set->next_timeout) ||
193 timercmp(&waiter->timeout,
194 &set->next_timeout, <))
195 set->next_timeout = waiter->timeout;
197 set->time_waiters[i_time] = waiter;
203 int waiter_poll(struct waitset *set)
205 struct timeval now, timeout;
206 struct waiter *waiter, *tmp;
210 /* If the waiters have been updated, we need to update our
214 if (timerisset(&set->next_timeout)) {
215 gettimeofday(&now, NULL);
216 timersub(&set->next_timeout, &now, &timeout);
217 timeout_ms = timeout.tv_sec * 1000 +
218 timeout.tv_usec / 1000;
226 rc = poll(set->pollfds, set->n_io_waiters, timeout_ms);
231 for (i = 0; i < set->n_io_waiters; i++) {
232 struct waiter *waiter = set->io_waiters[i];
237 if (!set->pollfds[i].revents)
239 rc = waiter->callback(waiter->arg);
242 waiter_remove(waiter);
245 if (set->n_time_waiters > 0)
246 gettimeofday(&now, NULL);
248 for (i = 0; i < set->n_time_waiters; i++) {
249 struct waiter *waiter = set->time_waiters[i];
254 if (timercmp(&waiter->timeout, &now, >))
257 waiter->callback(waiter->arg);
259 waiter_remove(waiter);
265 /* free any waiters that have been removed */
266 list_for_each_entry_safe(&set->free_list, waiter, tmp, list)
268 list_init(&set->free_list);