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dbus-mainloop.c
1 /* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
2 /* dbus-mainloop.c Main loop utility
3 *
4 * Copyright © 2003, 2004 Red Hat, Inc.
5 * Copyright © 2011 Nokia Corporation
6 *
7 * Licensed under the Academic Free License version 2.1
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 *
23 */
24
25 #include <config.h>
26 #include "dbus-mainloop.h"
27
28 #ifndef DOXYGEN_SHOULD_SKIP_THIS
29
30 #include <dbus/dbus-hash.h>
31 #include <dbus/dbus-list.h>
32 #include <dbus/dbus-socket-set.h>
33 #include <dbus/dbus-watch.h>
34
35 #define MAINLOOP_SPEW 0
36
37 struct DBusLoop
38 {
39 int refcount;
41 DBusHashTable *watches;
42 DBusSocketSet *socket_set;
43 DBusList *timeouts;
44 int callback_list_serial;
45 int watch_count;
46 int timeout_count;
47 int depth;
48 DBusList *need_dispatch;
51 unsigned oom_watch_pending : 1;
52 };
53
54 typedef struct
55 {
56 DBusTimeout *timeout;
57 unsigned long last_tv_sec;
58 unsigned long last_tv_usec;
59 } TimeoutCallback;
60
61 #define TIMEOUT_CALLBACK(callback) ((TimeoutCallback*)callback)
62
63 static TimeoutCallback*
64 timeout_callback_new (DBusTimeout *timeout)
65 {
66 TimeoutCallback *cb;
67
68 cb = dbus_new (TimeoutCallback, 1);
69 if (cb == NULL)
70 return NULL;
71
72 cb->timeout = timeout;
73 _dbus_get_monotonic_time (&cb->last_tv_sec,
74 &cb->last_tv_usec);
75 return cb;
76 }
77
78 static void
79 timeout_callback_free (TimeoutCallback *cb)
80 {
81 dbus_free (cb);
82 }
83
84 static void
85 free_watch_table_entry (void *data)
86 {
87 DBusList **watches = data;
88 DBusWatch *watch;
89
90 /* DBusHashTable sometimes calls free_function(NULL) even if you never
91 * have NULL as a value */
92 if (watches == NULL)
93 return;
94
95 for (watch = _dbus_list_pop_first (watches);
96 watch != NULL;
97 watch = _dbus_list_pop_first (watches))
98 {
99 _dbus_watch_unref (watch);
100 }
101
102 _dbus_assert (*watches == NULL);
103 dbus_free (watches);
104 }
105
106 DBusLoop*
107 _dbus_loop_new (void)
108 {
109 DBusLoop *loop;
110
111 loop = dbus_new0 (DBusLoop, 1);
112 if (loop == NULL)
113 return NULL;
114
115 loop->watches = _dbus_hash_table_new (DBUS_HASH_INT, NULL,
116 free_watch_table_entry);
117
118 loop->socket_set = _dbus_socket_set_new (0);
119
120 if (loop->watches == NULL || loop->socket_set == NULL)
121 {
122 if (loop->watches != NULL)
123 _dbus_hash_table_unref (loop->watches);
124
125 if (loop->socket_set != NULL)
126 _dbus_socket_set_free (loop->socket_set);
127
128 dbus_free (loop);
129 return NULL;
130 }
131
132 loop->refcount = 1;
133
134 return loop;
135 }
136
137 DBusLoop *
138 _dbus_loop_ref (DBusLoop *loop)
139 {
140 _dbus_assert (loop != NULL);
141 _dbus_assert (loop->refcount > 0);
142
143 loop->refcount += 1;
144
145 return loop;
146 }
147
148 void
149 _dbus_loop_unref (DBusLoop *loop)
150 {
151 _dbus_assert (loop != NULL);
152 _dbus_assert (loop->refcount > 0);
153
154 loop->refcount -= 1;
155 if (loop->refcount == 0)
156 {
157 while (loop->need_dispatch)
158 {
159 DBusConnection *connection = _dbus_list_pop_first (&loop->need_dispatch);
160
161 dbus_connection_unref (connection);
162 }
163
164 _dbus_hash_table_unref (loop->watches);
165 _dbus_socket_set_free (loop->socket_set);
166 dbus_free (loop);
167 }
168 }
169
170 static DBusList **
171 ensure_watch_table_entry (DBusLoop *loop,
172 int fd)
173 {
174 DBusList **watches;
175
176 watches = _dbus_hash_table_lookup_int (loop->watches, fd);
177
178 if (watches == NULL)
179 {
180 watches = dbus_new0 (DBusList *, 1);
181
182 if (watches == NULL)
183 return watches;
184
185 if (!_dbus_hash_table_insert_int (loop->watches, fd, watches))
186 {
187 dbus_free (watches);
188 watches = NULL;
189 }
190 }
191
192 return watches;
193 }
194
195 static void
196 cull_watches_for_invalid_fd (DBusLoop *loop,
197 int fd)
198 {
199 DBusList *link;
200 DBusList **watches;
201
202 _dbus_warn ("invalid request, socket fd %d not open\n", fd);
203 watches = _dbus_hash_table_lookup_int (loop->watches, fd);
204
205 if (watches != NULL)
206 {
207 for (link = _dbus_list_get_first_link (watches);
208 link != NULL;
209 link = _dbus_list_get_next_link (watches, link))
210 _dbus_watch_invalidate (link->data);
211 }
212
213 _dbus_hash_table_remove_int (loop->watches, fd);
214 }
215
216 static dbus_bool_t
217 gc_watch_table_entry (DBusLoop *loop,
218 DBusList **watches,
219 int fd)
220 {
221 /* If watches is already NULL we have nothing to do */
222 if (watches == NULL)
223 return FALSE;
224
225 /* We can't GC hash table entries if they're non-empty lists */
226 if (*watches != NULL)
227 return FALSE;
228
229 _dbus_hash_table_remove_int (loop->watches, fd);
230 return TRUE;
231 }
232
233 static void
234 refresh_watches_for_fd (DBusLoop *loop,
235 DBusList **watches,
236 int fd)
237 {
238 DBusList *link;
239 unsigned int flags = 0;
240 dbus_bool_t interested = FALSE;
241
242 _dbus_assert (fd != -1);
243
244 if (watches == NULL)
245 watches = _dbus_hash_table_lookup_int (loop->watches, fd);
246
247 /* we allocated this in the first _dbus_loop_add_watch for the fd, and keep
248 * it until there are none left */
249 _dbus_assert (watches != NULL);
250
251 for (link = _dbus_list_get_first_link (watches);
252 link != NULL;
253 link = _dbus_list_get_next_link (watches, link))
254 {
255 if (dbus_watch_get_enabled (link->data) &&
256 !_dbus_watch_get_oom_last_time (link->data))
257 {
258 flags |= dbus_watch_get_flags (link->data);
259 interested = TRUE;
260 }
261 }
262
263 if (interested)
264 _dbus_socket_set_enable (loop->socket_set, fd, flags);
265 else
266 _dbus_socket_set_disable (loop->socket_set, fd);
267 }
268
269 dbus_bool_t
270 _dbus_loop_add_watch (DBusLoop *loop,
271 DBusWatch *watch)
272 {
273 int fd;
274 DBusList **watches;
275
276 fd = dbus_watch_get_socket (watch);
277 _dbus_assert (fd != -1);
278
279 watches = ensure_watch_table_entry (loop, fd);
280
281 if (watches == NULL)
282 return FALSE;
283
284 if (!_dbus_list_append (watches, _dbus_watch_ref (watch)))
285 {
286 _dbus_watch_unref (watch);
287 gc_watch_table_entry (loop, watches, fd);
288
289 return FALSE;
290 }
291
292 if (_dbus_list_length_is_one (watches))
293 {
294 if (!_dbus_socket_set_add (loop->socket_set, fd,
295 dbus_watch_get_flags (watch),
296 dbus_watch_get_enabled (watch)))
297 {
298 _dbus_hash_table_remove_int (loop->watches, fd);
299 return FALSE;
300 }
301 }
302 else
303 {
304 /* we're modifying, not adding, which can't fail with OOM */
305 refresh_watches_for_fd (loop, watches, fd);
306 }
307
308 loop->callback_list_serial += 1;
309 loop->watch_count += 1;
310 return TRUE;
311 }
312
313 void
314 _dbus_loop_toggle_watch (DBusLoop *loop,
315 DBusWatch *watch)
316 {
317 refresh_watches_for_fd (loop, NULL, dbus_watch_get_socket (watch));
318 }
319
320 void
321 _dbus_loop_remove_watch (DBusLoop *loop,
322 DBusWatch *watch)
323 {
324 DBusList **watches;
325 DBusList *link;
326 int fd;
327
328 /* This relies on people removing watches before they invalidate them,
329 * which has been safe since fd.o #33336 was fixed. Assert about it
330 * so we don't regress. */
331 fd = dbus_watch_get_socket (watch);
332 _dbus_assert (fd != -1);
333
334 watches = _dbus_hash_table_lookup_int (loop->watches, fd);
335
336 if (watches != NULL)
337 {
338 link = _dbus_list_get_first_link (watches);
339 while (link != NULL)
340 {
341 DBusList *next = _dbus_list_get_next_link (watches, link);
342 DBusWatch *this = link->data;
343
344 if (this == watch)
345 {
346 _dbus_list_remove_link (watches, link);
347 loop->callback_list_serial += 1;
348 loop->watch_count -= 1;
349 _dbus_watch_unref (this);
350
351 /* if that was the last watch for that fd, drop the hash table
352 * entry, and stop reserving space for it in the socket set */
353 if (gc_watch_table_entry (loop, watches, fd))
354 {
355 _dbus_socket_set_remove (loop->socket_set, fd);
356 }
357
358 return;
359 }
360
361 link = next;
362 }
363 }
364
365 _dbus_warn ("could not find watch %p to remove\n", watch);
366 }
367
368 dbus_bool_t
369 _dbus_loop_add_timeout (DBusLoop *loop,
370 DBusTimeout *timeout)
371 {
372 TimeoutCallback *tcb;
373
374 tcb = timeout_callback_new (timeout);
375 if (tcb == NULL)
376 return FALSE;
377
378 if (_dbus_list_append (&loop->timeouts, tcb))
379 {
380 loop->callback_list_serial += 1;
381 loop->timeout_count += 1;
382 }
383 else
384 {
385 timeout_callback_free (tcb);
386 return FALSE;
387 }
388
389 return TRUE;
390 }
391
392 void
393 _dbus_loop_remove_timeout (DBusLoop *loop,
394 DBusTimeout *timeout)
395 {
396 DBusList *link;
397
398 link = _dbus_list_get_first_link (&loop->timeouts);
399 while (link != NULL)
400 {
401 DBusList *next = _dbus_list_get_next_link (&loop->timeouts, link);
402 TimeoutCallback *this = link->data;
403
404 if (this->timeout == timeout)
405 {
406 _dbus_list_remove_link (&loop->timeouts, link);
407 loop->callback_list_serial += 1;
408 loop->timeout_count -= 1;
409 timeout_callback_free (this);
410
411 return;
412 }
413
414 link = next;
415 }
416
417 _dbus_warn ("could not find timeout %p to remove\n", timeout);
418 }
419
420 /* Convolutions from GLib, there really must be a better way
421 * to do this.
422 */
423 static dbus_bool_t
424 check_timeout (unsigned long tv_sec,
425 unsigned long tv_usec,
426 TimeoutCallback *tcb,
427 int *timeout)
428 {
429 long sec_remaining;
430 long msec_remaining;
431 unsigned long expiration_tv_sec;
432 unsigned long expiration_tv_usec;
433 long interval_seconds;
434 long interval_milliseconds;
435 int interval;
436
437 /* I'm pretty sure this function could suck (a lot) less */
438
439 interval = dbus_timeout_get_interval (tcb->timeout);
440
441 interval_seconds = interval / 1000L;
442 interval_milliseconds = interval % 1000L;
443
444 expiration_tv_sec = tcb->last_tv_sec + interval_seconds;
445 expiration_tv_usec = tcb->last_tv_usec + interval_milliseconds * 1000;
446 if (expiration_tv_usec >= 1000000)
447 {
448 expiration_tv_usec -= 1000000;
449 expiration_tv_sec += 1;
450 }
451
452 sec_remaining = expiration_tv_sec - tv_sec;
453 /* need to force this to be signed, as it is intended to sometimes
454 * produce a negative result
455 */
456 msec_remaining = ((long) expiration_tv_usec - (long) tv_usec) / 1000L;
457
458 #if MAINLOOP_SPEW
459 _dbus_verbose ("Interval is %ld seconds %ld msecs\n",
460 interval_seconds,
461 interval_milliseconds);
462 _dbus_verbose ("Now is %lu seconds %lu usecs\n",
463 tv_sec, tv_usec);
464 _dbus_verbose ("Last is %lu seconds %lu usecs\n",
465 tcb->last_tv_sec, tcb->last_tv_usec);
466 _dbus_verbose ("Exp is %lu seconds %lu usecs\n",
467 expiration_tv_sec, expiration_tv_usec);
468 _dbus_verbose ("Pre-correction, sec_remaining %ld msec_remaining %ld\n",
469 sec_remaining, msec_remaining);
470 #endif
471
472 /* We do the following in a rather convoluted fashion to deal with
473 * the fact that we don't have an integral type big enough to hold
474 * the difference of two timevals in milliseconds.
475 */
476 if (sec_remaining < 0 || (sec_remaining == 0 && msec_remaining < 0))
477 {
478 *timeout = 0;
479 }
480 else
481 {
482 if (msec_remaining < 0)
483 {
484 msec_remaining += 1000;
485 sec_remaining -= 1;
486 }
487
488 if (sec_remaining > (_DBUS_INT_MAX / 1000) ||
489 msec_remaining > _DBUS_INT_MAX)
490 *timeout = _DBUS_INT_MAX;
491 else
492 *timeout = sec_remaining * 1000 + msec_remaining;
493 }
494
495 if (*timeout > interval)
496 {
497 /* This indicates that the system clock probably moved backward */
498 _dbus_verbose ("System clock set backward! Resetting timeout.\n");
499
500 tcb->last_tv_sec = tv_sec;
501 tcb->last_tv_usec = tv_usec;
502
503 *timeout = interval;
504 }
505
506 #if MAINLOOP_SPEW
507 _dbus_verbose (" timeout expires in %d milliseconds\n", *timeout);
508 #endif
509
510 return *timeout == 0;
511 }
512
513 dbus_bool_t
514 _dbus_loop_dispatch (DBusLoop *loop)
515 {
516
517 #if MAINLOOP_SPEW
518 _dbus_verbose (" %d connections to dispatch\n", _dbus_list_get_length (&loop->need_dispatch));
519 #endif
520
521 if (loop->need_dispatch == NULL)
522 return FALSE;
523
524 next:
525 while (loop->need_dispatch != NULL)
526 {
527 DBusConnection *connection = _dbus_list_pop_first (&loop->need_dispatch);
528
529 while (TRUE)
530 {
531 DBusDispatchStatus status;
532
533 status = dbus_connection_dispatch (connection);
534
535 if (status == DBUS_DISPATCH_COMPLETE)
536 {
537 dbus_connection_unref (connection);
538 goto next;
539 }
540 else
541 {
542 if (status == DBUS_DISPATCH_NEED_MEMORY)
543 _dbus_wait_for_memory ();
544 }
545 }
546 }
547
548 return TRUE;
549 }
550
551 dbus_bool_t
552 _dbus_loop_queue_dispatch (DBusLoop *loop,
553 DBusConnection *connection)
554 {
555 if (_dbus_list_append (&loop->need_dispatch, connection))
556 {
557 dbus_connection_ref (connection);
558 return TRUE;
559 }
560 else
561 return FALSE;
562 }
563
564 /* Returns TRUE if we invoked any timeouts or have ready file
565 * descriptors, which is just used in test code as a debug hack
566 */
567
568 dbus_bool_t
569 _dbus_loop_iterate (DBusLoop *loop,
570 dbus_bool_t block)
571 {
572 #define N_STACK_DESCRIPTORS 64
573 dbus_bool_t retval;
574 DBusSocketEvent ready_fds[N_STACK_DESCRIPTORS];
575 int i;
576 DBusList *link;
577 int n_ready;
578 int initial_serial;
579 long timeout;
580 int orig_depth;
581
582 retval = FALSE;
583
584 orig_depth = loop->depth;
585
586 #if MAINLOOP_SPEW
587 _dbus_verbose ("Iteration block=%d depth=%d timeout_count=%d watch_count=%d\n",
588 block, loop->depth, loop->timeout_count, loop->watch_count);
589 #endif
590
591 if (_dbus_hash_table_get_n_entries (loop->watches) == 0 &&
592 loop->timeouts == NULL)
593 goto next_iteration;
594
595 timeout = -1;
596 if (loop->timeout_count > 0)
597 {
598 unsigned long tv_sec;
599 unsigned long tv_usec;
600
601 _dbus_get_monotonic_time (&tv_sec, &tv_usec);
602
603 link = _dbus_list_get_first_link (&loop->timeouts);
604 while (link != NULL)
605 {
606 DBusList *next = _dbus_list_get_next_link (&loop->timeouts, link);
607 TimeoutCallback *tcb = link->data;
608
609 if (dbus_timeout_get_enabled (tcb->timeout))
610 {
611 int msecs_remaining;
612
613 check_timeout (tv_sec, tv_usec, tcb, &msecs_remaining);
614
615 if (timeout < 0)
616 timeout = msecs_remaining;
617 else
618 timeout = MIN (msecs_remaining, timeout);
619
620 #if MAINLOOP_SPEW
621 _dbus_verbose (" timeout added, %d remaining, aggregate timeout %ld\n",
622 msecs_remaining, timeout);
623 #endif
624
625 _dbus_assert (timeout >= 0);
626
627 if (timeout == 0)
628 break; /* it's not going to get shorter... */
629 }
630 #if MAINLOOP_SPEW
631 else
632 {
633 _dbus_verbose (" skipping disabled timeout\n");
634 }
635 #endif
636
637 link = next;
638 }
639 }
640
641 /* Never block if we have stuff to dispatch */
642 if (!block || loop->need_dispatch != NULL)
643 {
644 timeout = 0;
645 #if MAINLOOP_SPEW
646 _dbus_verbose (" timeout is 0 as we aren't blocking\n");
647 #endif
648 }
649
650 /* if a watch was OOM last time, don't wait longer than the OOM
651 * wait to re-enable it
652 */
653 if (loop->oom_watch_pending)
654 timeout = MIN (timeout, _dbus_get_oom_wait ());
655
656 #if MAINLOOP_SPEW
657 _dbus_verbose (" polling on %d descriptors timeout %ld\n", _DBUS_N_ELEMENTS (ready_fds), timeout);
658 #endif
659
660 n_ready = _dbus_socket_set_poll (loop->socket_set, ready_fds,
661 _DBUS_N_ELEMENTS (ready_fds), timeout);
662
663 /* re-enable any watches we skipped this time */
664 if (loop->oom_watch_pending)
665 {
666 DBusHashIter hash_iter;
667
668 loop->oom_watch_pending = FALSE;
669
670 _dbus_hash_iter_init (loop->watches, &hash_iter);
671
672 while (_dbus_hash_iter_next (&hash_iter))
673 {
674 DBusList **watches;
675 int fd;
676 dbus_bool_t changed;
677
678 changed = FALSE;
679 fd = _dbus_hash_iter_get_int_key (&hash_iter);
680 watches = _dbus_hash_iter_get_value (&hash_iter);
681
682 for (link = _dbus_list_get_first_link (watches);
683 link != NULL;
684 link = _dbus_list_get_next_link (watches, link))
685 {
686 DBusWatch *watch = link->data;
687
688 if (_dbus_watch_get_oom_last_time (watch))
689 {
690 _dbus_watch_set_oom_last_time (watch, FALSE);
691 changed = TRUE;
692 }
693 }
694
695 if (changed)
696 refresh_watches_for_fd (loop, watches, fd);
697 }
698
699 retval = TRUE; /* return TRUE here to keep the loop going,
700 * since we don't know the watch was inactive */
701 }
702
703 initial_serial = loop->callback_list_serial;
704
705 if (loop->timeout_count > 0)
706 {
707 unsigned long tv_sec;
708 unsigned long tv_usec;
709
710 _dbus_get_monotonic_time (&tv_sec, &tv_usec);
711
712 /* It'd be nice to avoid this O(n) thingy here */
713 link = _dbus_list_get_first_link (&loop->timeouts);
714 while (link != NULL)
715 {
716 DBusList *next = _dbus_list_get_next_link (&loop->timeouts, link);
717 TimeoutCallback *tcb = link->data;
718
719 if (initial_serial != loop->callback_list_serial)
720 goto next_iteration;
721
722 if (loop->depth != orig_depth)
723 goto next_iteration;
724
725 if (dbus_timeout_get_enabled (tcb->timeout))
726 {
727 int msecs_remaining;
728
729 if (check_timeout (tv_sec, tv_usec,
730 tcb, &msecs_remaining))
731 {
732 /* Save last callback time and fire this timeout */
733 tcb->last_tv_sec = tv_sec;
734 tcb->last_tv_usec = tv_usec;
735
736 #if MAINLOOP_SPEW
737 _dbus_verbose (" invoking timeout\n");
738 #endif
739
740 /* can theoretically return FALSE on OOM, but we just
741 * let it fire again later - in practice that's what
742 * every wrapper callback in dbus-daemon used to do */
743 dbus_timeout_handle (tcb->timeout);
744
745 retval = TRUE;
746 }
747 else
748 {
749 #if MAINLOOP_SPEW
750 _dbus_verbose (" timeout has not expired\n");
751 #endif
752 }
753 }
754 #if MAINLOOP_SPEW
755 else
756 {
757 _dbus_verbose (" skipping invocation of disabled timeout\n");
758 }
759 #endif
760
761 link = next;
762 }
763 }
764
765 if (n_ready > 0)
766 {
767 for (i = 0; i < n_ready; i++)
768 {
769 DBusList **watches;
770 DBusList *next;
771 unsigned int condition;
772 dbus_bool_t any_oom;
773
774 /* FIXME I think this "restart if we change the watches"
775 * approach could result in starving watches
776 * toward the end of the list.
777 */
778 if (initial_serial != loop->callback_list_serial)
779 goto next_iteration;
780
781 if (loop->depth != orig_depth)
782 goto next_iteration;
783
784 _dbus_assert (ready_fds[i].flags != 0);
785
786 if (_DBUS_UNLIKELY (ready_fds[i].flags & _DBUS_WATCH_NVAL))
787 {
788 cull_watches_for_invalid_fd (loop, ready_fds[i].fd);
789 goto next_iteration;
790 }
791
792 condition = ready_fds[i].flags;
793 _dbus_assert ((condition & _DBUS_WATCH_NVAL) == 0);
794
795 /* condition may still be 0 if we got some
796 * weird POLLFOO thing like POLLWRBAND
797 */
798 if (condition == 0)
799 continue;
800
801 watches = _dbus_hash_table_lookup_int (loop->watches,
802 ready_fds[i].fd);
803
804 if (watches == NULL)
805 continue;
806
807 any_oom = FALSE;
808
809 for (link = _dbus_list_get_first_link (watches);
810 link != NULL;
811 link = next)
812 {
813 DBusWatch *watch = link->data;
814
815 next = _dbus_list_get_next_link (watches, link);
816
817 if (dbus_watch_get_enabled (watch))
818 {
819 dbus_bool_t oom;
820
821 oom = !dbus_watch_handle (watch, condition);
822
823 if (oom)
824 {
825 _dbus_watch_set_oom_last_time (watch, TRUE);
826 loop->oom_watch_pending = TRUE;
827 any_oom = TRUE;
828 }
829
830 #if MAINLOOP_SPEW
831 _dbus_verbose (" Invoked watch, oom = %d\n", oom);
832 #endif
833 retval = TRUE;
834
835 /* We re-check this every time, in case the callback
836 * added/removed watches, which might make our position in
837 * the linked list invalid. See the FIXME above. */
838 if (initial_serial != loop->callback_list_serial ||
839 loop->depth != orig_depth)
840 {
841 if (any_oom)
842 refresh_watches_for_fd (loop, NULL, ready_fds[i].fd);
843
844 goto next_iteration;
845 }
846 }
847 }
848
849 if (any_oom)
850 refresh_watches_for_fd (loop, watches, ready_fds[i].fd);
851 }
852 }
853
854 next_iteration:
855 #if MAINLOOP_SPEW
856 _dbus_verbose (" moving to next iteration\n");
857 #endif
858
859 if (_dbus_loop_dispatch (loop))
860 retval = TRUE;
861
862 #if MAINLOOP_SPEW
863 _dbus_verbose ("Returning %d\n", retval);
864 #endif
865
866 return retval;
867 }
868
869 void
870 _dbus_loop_run (DBusLoop *loop)
871 {
872 int our_exit_depth;
873
874 _dbus_assert (loop->depth >= 0);
875
876 _dbus_loop_ref (loop);
877
878 our_exit_depth = loop->depth;
879 loop->depth += 1;
880
881 _dbus_verbose ("Running main loop, depth %d -> %d\n",
882 loop->depth - 1, loop->depth);
883
884 while (loop->depth != our_exit_depth)
885 _dbus_loop_iterate (loop, TRUE);
886
887 _dbus_loop_unref (loop);
888 }
889
890 void
891 _dbus_loop_quit (DBusLoop *loop)
892 {
893 _dbus_assert (loop->depth > 0);
894
895 loop->depth -= 1;
896
897 _dbus_verbose ("Quit main loop, depth %d -> %d\n",
898 loop->depth + 1, loop->depth);
899 }
900
901 int
902 _dbus_get_oom_wait (void)
903 {
904 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
905 /* make tests go fast */
906 return 0;
907 #else
908 return 500;
909 #endif
910 }
911
912 void
913 _dbus_wait_for_memory (void)
914 {
915 _dbus_verbose ("Waiting for more memory\n");
916 _dbus_sleep_milliseconds (_dbus_get_oom_wait ());
917 }
918
919 #endif /* !DOXYGEN_SHOULD_SKIP_THIS */
DBusTimeout
Internals of DBusTimeout.
Definition: dbus-timeout.c:40
_dbus_hash_table_get_n_entries
int _dbus_hash_table_get_n_entries(DBusHashTable *table)
Gets the number of hash entries in a hash table.
Definition: dbus-hash.c:1397
DBusDispatchStatus
DBusDispatchStatus
Indicates the status of incoming data on a DBusConnection.
Definition: dbus-connection.h:79
DBusWatch
Implementation of DBusWatch.
Definition: dbus-watch.c:40
NULL
#define NULL
A null pointer, defined appropriately for C or C++.
DBUS_DISPATCH_NEED_MEMORY
More memory is needed to continue.
Definition: dbus-connection.h:83
dbus_free
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
Definition: dbus-memory.c:701
_dbus_list_length_is_one
dbus_bool_t _dbus_list_length_is_one(DBusList **list)
Check whether length is exactly one.
Definition: dbus-list.c:783
_dbus_watch_invalidate
void _dbus_watch_invalidate(DBusWatch *watch)
Clears the file descriptor from a now-invalid watch object so that no one tries to use it...
Definition: dbus-watch.c:169
dbus_new
#define dbus_new(type, count)
Safe macro for using dbus_malloc().
Definition: dbus-memory.h:58
dbus_watch_get_enabled
DBUS_EXPORT dbus_bool_t dbus_watch_get_enabled(DBusWatch *watch)
Returns whether a watch is enabled or not.
Definition: dbus-watch.c:667
_dbus_list_remove_link
void _dbus_list_remove_link(DBusList **list, DBusList *link)
Removes a link from the list.
Definition: dbus-list.c:527
dbus_connection_ref
DBusConnection * dbus_connection_ref(DBusConnection *connection)
Increments the reference count of a DBusConnection.
Definition: dbus-connection.c:2681
_dbus_assert
#define _dbus_assert(condition)
Aborts with an error message if the condition is false.
Definition: dbus-internals.h:135
DBusList::data
void * data
Data stored at this element.
Definition: dbus-list.h:38
DBusConnection
Implementation details of DBusConnection.
Definition: dbus-connection.c:256
_dbus_hash_table_remove_int
dbus_bool_t _dbus_hash_table_remove_int(DBusHashTable *table, int key)
Removes the hash entry for the given key.
Definition: dbus-hash.c:1151
_dbus_hash_table_unref
void _dbus_hash_table_unref(DBusHashTable *table)
Decrements the reference count for a hash table, freeing the hash table if the count reaches zero...
Definition: dbus-hash.c:361
DBusHashIter
Hash iterator object.
Definition: dbus-hash.h:49
_dbus_list_get_next_link
#define _dbus_list_get_next_link(list, link)
Gets the next link in the list, or NULL if there are no more links.
Definition: dbus-list.h:90
_DBUS_INT_MAX
#define _DBUS_INT_MAX
Maximum value of type "int".
Definition: dbus-internals.h:231
_dbus_hash_table_lookup_int
void * _dbus_hash_table_lookup_int(DBusHashTable *table, int key)
Looks up the value for a given integer in a hash table of type DBUS_HASH_INT.
Definition: dbus-hash.c:1074
_dbus_get_monotonic_time
void _dbus_get_monotonic_time(long *tv_sec, long *tv_usec)
Get current time, as in gettimeofday().
Definition: dbus-sysdeps-unix.c:2671
dbus_timeout_get_enabled
DBUS_EXPORT dbus_bool_t dbus_timeout_get_enabled(DBusTimeout *timeout)
Returns whether a timeout is enabled or not.
Definition: dbus-timeout.c:486
_dbus_hash_iter_get_int_key
int _dbus_hash_iter_get_int_key(DBusHashIter *iter)
Gets the key for the current entry.
Definition: dbus-hash.c:659
DBUS_HASH_INT
Hash keys are integers.
Definition: dbus-hash.h:70
dbus_new0
#define dbus_new0(type, count)
Safe macro for using dbus_malloc0().
Definition: dbus-memory.h:59
_dbus_hash_table_new
DBusHashTable * _dbus_hash_table_new(DBusHashType type, DBusFreeFunction key_free_function, DBusFreeFunction value_free_function)
Constructs a new hash table.
Definition: dbus-hash.c:285
dbus_bool_t
dbus_uint32_t dbus_bool_t
A boolean, valid values are TRUE and FALSE.
Definition: dbus-types.h:35
dbus_watch_get_socket
DBUS_EXPORT int dbus_watch_get_socket(DBusWatch *watch)
Returns a socket to be watched, on UNIX this will return -1 if our transport is not socket-based so d...
Definition: dbus-watch.c:586
dbus_timeout_handle
DBUS_EXPORT dbus_bool_t dbus_timeout_handle(DBusTimeout *timeout)
Calls the timeout handler for this timeout.
Definition: dbus-timeout.c:472
dbus_connection_dispatch
DBusDispatchStatus dbus_connection_dispatch(DBusConnection *connection)
Processes any incoming data.
Definition: dbus-connection.c:4549
DBUS_DISPATCH_COMPLETE
All currently available data has been processed.
Definition: dbus-connection.h:82
_dbus_warn
void _dbus_warn(const char *format,...)
Prints a warning message to stderr.
Definition: dbus-internals.c:230
_dbus_list_append
dbus_bool_t _dbus_list_append(DBusList **list, void *data)
Appends a value to the list.
Definition: dbus-list.c:270
_dbus_hash_iter_next
dbus_bool_t _dbus_hash_iter_next(DBusHashIter *iter)
Move the hash iterator forward one step, to the next hash entry.
Definition: dbus-hash.c:543
_dbus_list_pop_first
void * _dbus_list_pop_first(DBusList **list)
Removes the first value in the list and returns it.
Definition: dbus-list.c:649
_DBUS_N_ELEMENTS
#define _DBUS_N_ELEMENTS(array)
Computes the number of elements in a fixed-size array using sizeof().
Definition: dbus-internals.h:174
_dbus_hash_table_insert_int
dbus_bool_t _dbus_hash_table_insert_int(DBusHashTable *table, int key, void *value)
Creates a hash entry with the given key and value.
Definition: dbus-hash.c:1248
TRUE
#define TRUE
Expands to "1".
_dbus_watch_ref
DBusWatch * _dbus_watch_ref(DBusWatch *watch)
Increments the reference count of a DBusWatch object.
Definition: dbus-watch.c:124
DBusList
A node in a linked list.
Definition: dbus-list.h:34
_dbus_list_get_length
int _dbus_list_get_length(DBusList **list)
Gets the length of a list.
Definition: dbus-list.c:730
_dbus_hash_iter_init
void _dbus_hash_iter_init(DBusHashTable *table, DBusHashIter *iter)
Initializes a hash table iterator.
Definition: dbus-hash.c:517
_dbus_hash_iter_get_value
void * _dbus_hash_iter_get_value(DBusHashIter *iter)
Gets the value of the current entry.
Definition: dbus-hash.c:613
_dbus_list_get_first_link
DBusList * _dbus_list_get_first_link(DBusList **list)
Gets the first link in the list.
Definition: dbus-list.c:567
FALSE
#define FALSE
Expands to "0".
dbus_watch_handle
DBUS_EXPORT dbus_bool_t dbus_watch_handle(DBusWatch *watch, unsigned int flags)
Called to notify the D-Bus library when a previously-added watch is ready for reading or writing...
Definition: dbus-watch.c:698
_dbus_watch_unref
void _dbus_watch_unref(DBusWatch *watch)
Decrements the reference count of a DBusWatch object and finalizes the object if the count reaches ze...
Definition: dbus-watch.c:138
dbus_watch_get_flags
DBUS_EXPORT unsigned int dbus_watch_get_flags(DBusWatch *watch)
Gets flags from DBusWatchFlags indicating what conditions should be monitored on the file descriptor...
Definition: dbus-watch.c:607
dbus_connection_unref
void dbus_connection_unref(DBusConnection *connection)
Decrements the reference count of a DBusConnection, and finalizes it if the count reaches zero...
Definition: dbus-connection.c:2817
DBusHashTable
Internals of DBusHashTable.
Definition: dbus-hash.c:168
_dbus_sleep_milliseconds
void _dbus_sleep_milliseconds(int milliseconds)
Sleeps the given number of milliseconds.
Definition: dbus-sysdeps-unix.c:2803
dbus_timeout_get_interval
DBUS_EXPORT int dbus_timeout_get_interval(DBusTimeout *timeout)
Gets the timeout interval.
Definition: dbus-timeout.c:416