D-Bus  1.13.7
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-timeout.h>
34 #include <dbus/dbus-watch.h>
35 
36 #define MAINLOOP_SPEW 0
37 
38 struct DBusLoop
39 {
40  int refcount;
42  DBusHashTable *watches;
43  DBusSocketSet *socket_set;
44  DBusList *timeouts;
45  int callback_list_serial;
46  int watch_count;
47  int timeout_count;
48  int depth;
49  DBusList *need_dispatch;
52  unsigned oom_watch_pending : 1;
53 };
54 
55 typedef struct
56 {
57  DBusTimeout *timeout;
58  long last_tv_sec;
59  long last_tv_usec;
60 } TimeoutCallback;
61 
62 #define TIMEOUT_CALLBACK(callback) ((TimeoutCallback*)callback)
63 
64 static TimeoutCallback*
65 timeout_callback_new (DBusTimeout *timeout)
66 {
67  TimeoutCallback *cb;
68 
69  cb = dbus_new (TimeoutCallback, 1);
70  if (cb == NULL)
71  return NULL;
72 
73  cb->timeout = timeout;
74  _dbus_get_monotonic_time (&cb->last_tv_sec,
75  &cb->last_tv_usec);
76  return cb;
77 }
78 
79 static void
80 timeout_callback_free (TimeoutCallback *cb)
81 {
82  dbus_free (cb);
83 }
84 
85 static void
86 free_watch_table_entry (void *data)
87 {
88  DBusList **watches = data;
89  DBusWatch *watch;
90 
91  /* DBusHashTable sometimes calls free_function(NULL) even if you never
92  * have NULL as a value */
93  if (watches == NULL)
94  return;
95 
96  for (watch = _dbus_list_pop_first (watches);
97  watch != NULL;
98  watch = _dbus_list_pop_first (watches))
99  {
100  _dbus_watch_unref (watch);
101  }
102 
103  _dbus_assert (*watches == NULL);
104  dbus_free (watches);
105 }
106 
107 DBusLoop*
108 _dbus_loop_new (void)
109 {
110  DBusLoop *loop;
111 
112  loop = dbus_new0 (DBusLoop, 1);
113  if (loop == NULL)
114  return NULL;
115 
116  loop->watches = _dbus_hash_table_new (DBUS_HASH_POLLABLE, NULL,
117  free_watch_table_entry);
118 
119  loop->socket_set = _dbus_socket_set_new (0);
120 
121  if (loop->watches == NULL || loop->socket_set == NULL)
122  {
123  if (loop->watches != NULL)
124  _dbus_hash_table_unref (loop->watches);
125 
126  if (loop->socket_set != NULL)
127  _dbus_socket_set_free (loop->socket_set);
128 
129  dbus_free (loop);
130  return NULL;
131  }
132 
133  loop->refcount = 1;
134 
135  return loop;
136 }
137 
138 DBusLoop *
139 _dbus_loop_ref (DBusLoop *loop)
140 {
141  _dbus_assert (loop != NULL);
142  _dbus_assert (loop->refcount > 0);
143 
144  loop->refcount += 1;
145 
146  return loop;
147 }
148 
149 void
150 _dbus_loop_unref (DBusLoop *loop)
151 {
152  _dbus_assert (loop != NULL);
153  _dbus_assert (loop->refcount > 0);
154 
155  loop->refcount -= 1;
156  if (loop->refcount == 0)
157  {
158  while (loop->need_dispatch)
159  {
160  DBusConnection *connection = _dbus_list_pop_first (&loop->need_dispatch);
161 
162  dbus_connection_unref (connection);
163  }
164 
165  _dbus_hash_table_unref (loop->watches);
166  _dbus_socket_set_free (loop->socket_set);
167  dbus_free (loop);
168  }
169 }
170 
171 static DBusList **
172 ensure_watch_table_entry (DBusLoop *loop,
173  DBusPollable fd)
174 {
175  DBusList **watches;
176 
177  watches = _dbus_hash_table_lookup_pollable (loop->watches, fd);
178 
179  if (watches == NULL)
180  {
181  watches = dbus_new0 (DBusList *, 1);
182 
183  if (watches == NULL)
184  return watches;
185 
186  if (!_dbus_hash_table_insert_pollable (loop->watches, fd, watches))
187  {
188  dbus_free (watches);
189  watches = NULL;
190  }
191  }
192 
193  return watches;
194 }
195 
196 static void
197 cull_watches_for_invalid_fd (DBusLoop *loop,
198  DBusPollable fd)
199 {
200  DBusList *link;
201  DBusList **watches;
202 
203  _dbus_warn ("invalid request, socket fd %" DBUS_POLLABLE_FORMAT " not open",
204  _dbus_pollable_printable (fd));
205  watches = _dbus_hash_table_lookup_pollable (loop->watches, fd);
206 
207  if (watches != NULL)
208  {
209  for (link = _dbus_list_get_first_link (watches);
210  link != NULL;
211  link = _dbus_list_get_next_link (watches, link))
213  }
214 
215  _dbus_hash_table_remove_pollable (loop->watches, fd);
216 }
217 
218 static dbus_bool_t
219 gc_watch_table_entry (DBusLoop *loop,
220  DBusList **watches,
221  DBusPollable fd)
222 {
223  /* If watches is already NULL we have nothing to do */
224  if (watches == NULL)
225  return FALSE;
226 
227  /* We can't GC hash table entries if they're non-empty lists */
228  if (*watches != NULL)
229  return FALSE;
230 
231  _dbus_hash_table_remove_pollable (loop->watches, fd);
232  return TRUE;
233 }
234 
235 static void
236 refresh_watches_for_fd (DBusLoop *loop,
237  DBusList **watches,
238  DBusPollable fd)
239 {
240  DBusList *link;
241  unsigned int flags = 0;
242  dbus_bool_t interested = FALSE;
243 
244  _dbus_assert (_dbus_pollable_is_valid (fd));
245 
246  if (watches == NULL)
247  watches = _dbus_hash_table_lookup_pollable (loop->watches, fd);
248 
249  /* we allocated this in the first _dbus_loop_add_watch for the fd, and keep
250  * it until there are none left */
251  _dbus_assert (watches != NULL);
252 
253  for (link = _dbus_list_get_first_link (watches);
254  link != NULL;
255  link = _dbus_list_get_next_link (watches, link))
256  {
257  if (dbus_watch_get_enabled (link->data) &&
258  !_dbus_watch_get_oom_last_time (link->data))
259  {
260  flags |= dbus_watch_get_flags (link->data);
261  interested = TRUE;
262  }
263  }
264 
265  if (interested)
266  _dbus_socket_set_enable (loop->socket_set, fd, flags);
267  else
268  _dbus_socket_set_disable (loop->socket_set, fd);
269 }
270 
272 _dbus_loop_add_watch (DBusLoop *loop,
273  DBusWatch *watch)
274 {
275  DBusPollable fd;
276  DBusList **watches;
277 
278  fd = _dbus_watch_get_pollable (watch);
279  _dbus_assert (_dbus_pollable_is_valid (fd));
280 
281  watches = ensure_watch_table_entry (loop, fd);
282 
283  if (watches == NULL)
284  return FALSE;
285 
286  if (!_dbus_list_append (watches, _dbus_watch_ref (watch)))
287  {
288  _dbus_watch_unref (watch);
289  gc_watch_table_entry (loop, watches, fd);
290 
291  return FALSE;
292  }
293 
294  if (_dbus_list_length_is_one (watches))
295  {
296  if (!_dbus_socket_set_add (loop->socket_set, fd,
297  dbus_watch_get_flags (watch),
298  dbus_watch_get_enabled (watch)))
299  {
300  _dbus_hash_table_remove_pollable (loop->watches, fd);
301  return FALSE;
302  }
303  }
304  else
305  {
306  /* we're modifying, not adding, which can't fail with OOM */
307  refresh_watches_for_fd (loop, watches, fd);
308  }
309 
310  loop->callback_list_serial += 1;
311  loop->watch_count += 1;
312  return TRUE;
313 }
314 
315 void
316 _dbus_loop_toggle_watch (DBusLoop *loop,
317  DBusWatch *watch)
318 {
319  refresh_watches_for_fd (loop, NULL, _dbus_watch_get_pollable (watch));
320 }
321 
322 void
323 _dbus_loop_remove_watch (DBusLoop *loop,
324  DBusWatch *watch)
325 {
326  DBusList **watches;
327  DBusList *link;
328  DBusPollable fd;
329 
330  /* This relies on people removing watches before they invalidate them,
331  * which has been safe since fd.o #33336 was fixed. Assert about it
332  * so we don't regress. */
333  fd = _dbus_watch_get_pollable (watch);
334  _dbus_assert (_dbus_pollable_is_valid (fd));
335 
336  watches = _dbus_hash_table_lookup_pollable (loop->watches, fd);
337 
338  if (watches != NULL)
339  {
340  link = _dbus_list_get_first_link (watches);
341  while (link != NULL)
342  {
343  DBusList *next = _dbus_list_get_next_link (watches, link);
344  DBusWatch *this = link->data;
345 
346  if (this == watch)
347  {
348  _dbus_list_remove_link (watches, link);
349  loop->callback_list_serial += 1;
350  loop->watch_count -= 1;
351  _dbus_watch_unref (this);
352 
353  /* if that was the last watch for that fd, drop the hash table
354  * entry, and stop reserving space for it in the socket set */
355  if (gc_watch_table_entry (loop, watches, fd))
356  {
357  _dbus_socket_set_remove (loop->socket_set, fd);
358  }
359 
360  return;
361  }
362 
363  link = next;
364  }
365  }
366 
367  _dbus_warn ("could not find watch %p to remove", watch);
368 }
369 
371 _dbus_loop_add_timeout (DBusLoop *loop,
372  DBusTimeout *timeout)
373 {
374  TimeoutCallback *tcb;
375 
376  tcb = timeout_callback_new (timeout);
377  if (tcb == NULL)
378  return FALSE;
379 
380  if (_dbus_list_append (&loop->timeouts, tcb))
381  {
382  loop->callback_list_serial += 1;
383  loop->timeout_count += 1;
384  }
385  else
386  {
387  timeout_callback_free (tcb);
388  return FALSE;
389  }
390 
391  return TRUE;
392 }
393 
394 void
395 _dbus_loop_remove_timeout (DBusLoop *loop,
396  DBusTimeout *timeout)
397 {
398  DBusList *link;
399 
400  link = _dbus_list_get_first_link (&loop->timeouts);
401  while (link != NULL)
402  {
403  DBusList *next = _dbus_list_get_next_link (&loop->timeouts, link);
404  TimeoutCallback *this = link->data;
405 
406  if (this->timeout == timeout)
407  {
408  _dbus_list_remove_link (&loop->timeouts, link);
409  loop->callback_list_serial += 1;
410  loop->timeout_count -= 1;
411  timeout_callback_free (this);
412 
413  return;
414  }
415 
416  link = next;
417  }
418 
419  _dbus_warn ("could not find timeout %p to remove", timeout);
420 }
421 
422 /* Convolutions from GLib, there really must be a better way
423  * to do this.
424  */
425 static dbus_bool_t
426 check_timeout (long tv_sec,
427  long tv_usec,
428  TimeoutCallback *tcb,
429  int *timeout)
430 {
431  long sec_remaining;
432  long msec_remaining;
433  long expiration_tv_sec;
434  long expiration_tv_usec;
435  long interval_seconds;
436  long interval_milliseconds;
437  int interval;
438 
439  /* I'm pretty sure this function could suck (a lot) less */
440 
441  interval = dbus_timeout_get_interval (tcb->timeout);
442 
443  interval_seconds = interval / 1000L;
444  interval_milliseconds = interval % 1000L;
445 
446  expiration_tv_sec = tcb->last_tv_sec + interval_seconds;
447  expiration_tv_usec = tcb->last_tv_usec + interval_milliseconds * 1000;
448  if (expiration_tv_usec >= 1000000)
449  {
450  expiration_tv_usec -= 1000000;
451  expiration_tv_sec += 1;
452  }
453 
454  sec_remaining = expiration_tv_sec - tv_sec;
455  msec_remaining = (expiration_tv_usec - tv_usec) / 1000L;
456 
457 #if MAINLOOP_SPEW
458  _dbus_verbose ("Interval is %ld seconds %ld msecs\n",
459  interval_seconds,
460  interval_milliseconds);
461  _dbus_verbose ("Now is %lu seconds %lu usecs\n",
462  tv_sec, tv_usec);
463  _dbus_verbose ("Last is %lu seconds %lu usecs\n",
464  tcb->last_tv_sec, tcb->last_tv_usec);
465  _dbus_verbose ("Exp is %lu seconds %lu usecs\n",
466  expiration_tv_sec, expiration_tv_usec);
467  _dbus_verbose ("Pre-correction, sec_remaining %ld msec_remaining %ld\n",
468  sec_remaining, msec_remaining);
469 #endif
470 
471  /* We do the following in a rather convoluted fashion to deal with
472  * the fact that we don't have an integral type big enough to hold
473  * the difference of two timevals in milliseconds.
474  */
475  if (sec_remaining < 0 || (sec_remaining == 0 && msec_remaining < 0))
476  {
477  *timeout = 0;
478  }
479  else
480  {
481  if (msec_remaining < 0)
482  {
483  msec_remaining += 1000;
484  sec_remaining -= 1;
485  }
486 
487  if (sec_remaining > (_DBUS_INT_MAX / 1000) ||
488  msec_remaining > _DBUS_INT_MAX)
489  *timeout = _DBUS_INT_MAX;
490  else
491  *timeout = sec_remaining * 1000 + msec_remaining;
492  }
493 
494  if (*timeout > interval)
495  {
496  /* This indicates that the system clock probably moved backward */
497  _dbus_verbose ("System clock set backward! Resetting timeout.\n");
498 
499  tcb->last_tv_sec = tv_sec;
500  tcb->last_tv_usec = tv_usec;
501 
502  *timeout = interval;
503  }
504 
505 #if MAINLOOP_SPEW
506  _dbus_verbose (" timeout expires in %d milliseconds\n", *timeout);
507 #endif
508 
509  return *timeout == 0;
510 }
511 
513 _dbus_loop_dispatch (DBusLoop *loop)
514 {
515 
516 #if MAINLOOP_SPEW
517  _dbus_verbose (" %d connections to dispatch\n", _dbus_list_get_length (&loop->need_dispatch));
518 #endif
519 
520  if (loop->need_dispatch == NULL)
521  return FALSE;
522 
523  next:
524  while (loop->need_dispatch != NULL)
525  {
526  DBusConnection *connection = _dbus_list_pop_first (&loop->need_dispatch);
527 
528  while (TRUE)
529  {
530  DBusDispatchStatus status;
531 
532  status = dbus_connection_dispatch (connection);
533 
534  if (status == DBUS_DISPATCH_COMPLETE)
535  {
536  dbus_connection_unref (connection);
537  goto next;
538  }
539  else
540  {
541  if (status == DBUS_DISPATCH_NEED_MEMORY)
542  _dbus_wait_for_memory ();
543  }
544  }
545  }
546 
547  return TRUE;
548 }
549 
551 _dbus_loop_queue_dispatch (DBusLoop *loop,
552  DBusConnection *connection)
553 {
554  if (_dbus_list_append (&loop->need_dispatch, connection))
555  {
556  dbus_connection_ref (connection);
557  return TRUE;
558  }
559  else
560  return FALSE;
561 }
562 
563 /* Returns TRUE if we invoked any timeouts or have ready file
564  * descriptors, which is just used in test code as a debug hack
565  */
566 
568 _dbus_loop_iterate (DBusLoop *loop,
569  dbus_bool_t block)
570 {
571 #define N_STACK_DESCRIPTORS 64
572  dbus_bool_t retval;
573  DBusSocketEvent ready_fds[N_STACK_DESCRIPTORS];
574  int i;
575  DBusList *link;
576  int n_ready;
577  int initial_serial;
578  long timeout;
579  int orig_depth;
580 
581  retval = FALSE;
582 
583  orig_depth = loop->depth;
584 
585 #if MAINLOOP_SPEW
586  _dbus_verbose ("Iteration block=%d depth=%d timeout_count=%d watch_count=%d\n",
587  block, loop->depth, loop->timeout_count, loop->watch_count);
588 #endif
589 
590  if (_dbus_hash_table_get_n_entries (loop->watches) == 0 &&
591  loop->timeouts == NULL)
592  goto next_iteration;
593 
594  timeout = -1;
595  if (loop->timeout_count > 0)
596  {
597  long tv_sec;
598  long tv_usec;
599 
600  _dbus_get_monotonic_time (&tv_sec, &tv_usec);
601 
602  link = _dbus_list_get_first_link (&loop->timeouts);
603  while (link != NULL)
604  {
605  DBusList *next = _dbus_list_get_next_link (&loop->timeouts, link);
606  TimeoutCallback *tcb = link->data;
607 
608  if (dbus_timeout_get_enabled (tcb->timeout))
609  {
610  int msecs_remaining;
611 
612  if (_dbus_timeout_needs_restart (tcb->timeout))
613  {
614  tcb->last_tv_sec = tv_sec;
615  tcb->last_tv_usec = tv_usec;
616  _dbus_timeout_restarted (tcb->timeout);
617  }
618 
619  check_timeout (tv_sec, tv_usec, tcb, &msecs_remaining);
620 
621  if (timeout < 0)
622  timeout = msecs_remaining;
623  else
624  timeout = MIN (msecs_remaining, timeout);
625 
626 #if MAINLOOP_SPEW
627  _dbus_verbose (" timeout added, %d remaining, aggregate timeout %ld\n",
628  msecs_remaining, timeout);
629 #endif
630 
631  _dbus_assert (timeout >= 0);
632  }
633 #if MAINLOOP_SPEW
634  else
635  {
636  _dbus_verbose (" skipping disabled timeout\n");
637  }
638 #endif
639 
640  link = next;
641  }
642  }
643 
644  /* Never block if we have stuff to dispatch */
645  if (!block || loop->need_dispatch != NULL)
646  {
647  timeout = 0;
648 #if MAINLOOP_SPEW
649  _dbus_verbose (" timeout is 0 as we aren't blocking\n");
650 #endif
651  }
652 
653  /* if a watch was OOM last time, don't wait longer than the OOM
654  * wait to re-enable it
655  */
656  if (loop->oom_watch_pending)
657  timeout = MIN (timeout, _dbus_get_oom_wait ());
658 
659 #if MAINLOOP_SPEW
660  _dbus_verbose (" polling on %d descriptors timeout %ld\n", _DBUS_N_ELEMENTS (ready_fds), timeout);
661 #endif
662 
663  n_ready = _dbus_socket_set_poll (loop->socket_set, ready_fds,
664  _DBUS_N_ELEMENTS (ready_fds), timeout);
665 
666  /* re-enable any watches we skipped this time */
667  if (loop->oom_watch_pending)
668  {
669  DBusHashIter hash_iter;
670 
671  loop->oom_watch_pending = FALSE;
672 
673  _dbus_hash_iter_init (loop->watches, &hash_iter);
674 
675  while (_dbus_hash_iter_next (&hash_iter))
676  {
677  DBusList **watches;
678  DBusPollable fd;
679  dbus_bool_t changed;
680 
681  changed = FALSE;
682  fd = _dbus_hash_iter_get_pollable_key (&hash_iter);
683  watches = _dbus_hash_iter_get_value (&hash_iter);
684 
685  for (link = _dbus_list_get_first_link (watches);
686  link != NULL;
687  link = _dbus_list_get_next_link (watches, link))
688  {
689  DBusWatch *watch = link->data;
690 
691  if (_dbus_watch_get_oom_last_time (watch))
692  {
693  _dbus_watch_set_oom_last_time (watch, FALSE);
694  changed = TRUE;
695  }
696  }
697 
698  if (changed)
699  refresh_watches_for_fd (loop, watches, fd);
700  }
701 
702  retval = TRUE; /* return TRUE here to keep the loop going,
703  * since we don't know the watch was inactive */
704  }
705 
706  initial_serial = loop->callback_list_serial;
707 
708  if (loop->timeout_count > 0)
709  {
710  long tv_sec;
711  long tv_usec;
712 
713  _dbus_get_monotonic_time (&tv_sec, &tv_usec);
714 
715  /* It'd be nice to avoid this O(n) thingy here */
716  link = _dbus_list_get_first_link (&loop->timeouts);
717  while (link != NULL)
718  {
719  DBusList *next = _dbus_list_get_next_link (&loop->timeouts, link);
720  TimeoutCallback *tcb = link->data;
721 
722  if (initial_serial != loop->callback_list_serial)
723  goto next_iteration;
724 
725  if (loop->depth != orig_depth)
726  goto next_iteration;
727 
728  if (dbus_timeout_get_enabled (tcb->timeout))
729  {
730  int msecs_remaining;
731 
732  if (check_timeout (tv_sec, tv_usec,
733  tcb, &msecs_remaining))
734  {
735  /* Save last callback time and fire this timeout */
736  tcb->last_tv_sec = tv_sec;
737  tcb->last_tv_usec = tv_usec;
738 
739 #if MAINLOOP_SPEW
740  _dbus_verbose (" invoking timeout\n");
741 #endif
742 
743  /* can theoretically return FALSE on OOM, but we just
744  * let it fire again later - in practice that's what
745  * every wrapper callback in dbus-daemon used to do */
746  dbus_timeout_handle (tcb->timeout);
747 
748  retval = TRUE;
749  }
750  else
751  {
752 #if MAINLOOP_SPEW
753  _dbus_verbose (" timeout has not expired\n");
754 #endif
755  }
756  }
757 #if MAINLOOP_SPEW
758  else
759  {
760  _dbus_verbose (" skipping invocation of disabled timeout\n");
761  }
762 #endif
763 
764  link = next;
765  }
766  }
767 
768  if (n_ready > 0)
769  {
770  for (i = 0; i < n_ready; i++)
771  {
772  DBusList **watches;
773  DBusList *next;
774  unsigned int condition;
775  dbus_bool_t any_oom;
776 
777  /* FIXME I think this "restart if we change the watches"
778  * approach could result in starving watches
779  * toward the end of the list.
780  */
781  if (initial_serial != loop->callback_list_serial)
782  goto next_iteration;
783 
784  if (loop->depth != orig_depth)
785  goto next_iteration;
786 
787  _dbus_assert (ready_fds[i].flags != 0);
788 
789  if (_DBUS_UNLIKELY (ready_fds[i].flags & _DBUS_WATCH_NVAL))
790  {
791  cull_watches_for_invalid_fd (loop, ready_fds[i].fd);
792  goto next_iteration;
793  }
794 
795  condition = ready_fds[i].flags;
796  _dbus_assert ((condition & _DBUS_WATCH_NVAL) == 0);
797 
798  /* condition may still be 0 if we got some
799  * weird POLLFOO thing like POLLWRBAND
800  */
801  if (condition == 0)
802  continue;
803 
804  watches = _dbus_hash_table_lookup_pollable (loop->watches,
805  ready_fds[i].fd);
806 
807  if (watches == NULL)
808  continue;
809 
810  any_oom = FALSE;
811 
812  for (link = _dbus_list_get_first_link (watches);
813  link != NULL;
814  link = next)
815  {
816  DBusWatch *watch = link->data;
817 
818  next = _dbus_list_get_next_link (watches, link);
819 
820  if (dbus_watch_get_enabled (watch))
821  {
822  dbus_bool_t oom;
823 
824  oom = !dbus_watch_handle (watch, condition);
825 
826  if (oom)
827  {
828  _dbus_watch_set_oom_last_time (watch, TRUE);
829  loop->oom_watch_pending = TRUE;
830  any_oom = TRUE;
831  }
832 
833 #if MAINLOOP_SPEW
834  _dbus_verbose (" Invoked watch, oom = %d\n", oom);
835 #endif
836  retval = TRUE;
837 
838  /* We re-check this every time, in case the callback
839  * added/removed watches, which might make our position in
840  * the linked list invalid. See the FIXME above. */
841  if (initial_serial != loop->callback_list_serial ||
842  loop->depth != orig_depth)
843  {
844  if (any_oom)
845  refresh_watches_for_fd (loop, NULL, ready_fds[i].fd);
846 
847  goto next_iteration;
848  }
849  }
850  }
851 
852  if (any_oom)
853  refresh_watches_for_fd (loop, watches, ready_fds[i].fd);
854  }
855  }
856 
857  next_iteration:
858 #if MAINLOOP_SPEW
859  _dbus_verbose (" moving to next iteration\n");
860 #endif
861 
862  if (_dbus_loop_dispatch (loop))
863  retval = TRUE;
864 
865 #if MAINLOOP_SPEW
866  _dbus_verbose ("Returning %d\n", retval);
867 #endif
868 
869  return retval;
870 }
871 
872 void
873 _dbus_loop_run (DBusLoop *loop)
874 {
875  int our_exit_depth;
876 
877  _dbus_assert (loop->depth >= 0);
878 
879  _dbus_loop_ref (loop);
880 
881  our_exit_depth = loop->depth;
882  loop->depth += 1;
883 
884  _dbus_verbose ("Running main loop, depth %d -> %d\n",
885  loop->depth - 1, loop->depth);
886 
887  while (loop->depth != our_exit_depth)
888  _dbus_loop_iterate (loop, TRUE);
889 
890  _dbus_loop_unref (loop);
891 }
892 
893 void
894 _dbus_loop_quit (DBusLoop *loop)
895 {
896  _dbus_assert (loop->depth > 0);
897 
898  loop->depth -= 1;
899 
900  _dbus_verbose ("Quit main loop, depth %d -> %d\n",
901  loop->depth + 1, loop->depth);
902 }
903 
904 int
905 _dbus_get_oom_wait (void)
906 {
907 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
908  /* make tests go fast */
909  return 0;
910 #else
911  return 500;
912 #endif
913 }
914 
915 void
916 _dbus_wait_for_memory (void)
917 {
918  _dbus_verbose ("Waiting for more memory\n");
919  _dbus_sleep_milliseconds (_dbus_get_oom_wait ());
920 }
921 
922 #endif /* !DOXYGEN_SHOULD_SKIP_THIS */
Internals of DBusTimeout.
Definition: dbus-timeout.c:40
DBusDispatchStatus
Indicates the status of incoming data on a DBusConnection.
Implementation of DBusWatch.
Definition: dbus-watch.c:40
#define NULL
A null pointer, defined appropriately for C or C++.
More memory is needed to continue.
void dbus_free(void *memory)
Frees a block of memory previously allocated by dbus_malloc() or dbus_malloc0().
Definition: dbus-memory.c:703
dbus_bool_t _dbus_timeout_needs_restart(DBusTimeout *timeout)
Returns whether a timeout needs restart time counting in the event loop.
Definition: dbus-timeout.c:387
dbus_bool_t _dbus_list_length_is_one(DBusList **list)
Check whether length is exactly one.
Definition: dbus-list.c:811
#define dbus_new(type, count)
Safe macro for using dbus_malloc().
Definition: dbus-memory.h:57
DBUS_EXPORT dbus_bool_t dbus_watch_get_enabled(DBusWatch *watch)
Returns whether a watch is enabled or not.
Definition: dbus-watch.c:702
void _dbus_list_remove_link(DBusList **list, DBusList *link)
Removes a link from the list.
Definition: dbus-list.c:528
DBusConnection * dbus_connection_ref(DBusConnection *connection)
Increments the reference count of a DBusConnection.
#define _dbus_assert(condition)
Aborts with an error message if the condition is false.
void * data
Data stored at this element.
Definition: dbus-list.h:38
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:362
Implementation details of DBusConnection.
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:544
Hash iterator object.
Definition: dbus-hash.h:49
#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:119
#define _DBUS_INT_MAX
Maximum value of type "int".
DBUS_EXPORT dbus_bool_t dbus_timeout_get_enabled(DBusTimeout *timeout)
Returns whether a timeout is enabled or not.
Definition: dbus-timeout.c:512
#define dbus_new0(type, count)
Safe macro for using dbus_malloc0().
Definition: dbus-memory.h:58
int _dbus_hash_table_get_n_entries(DBusHashTable *table)
Gets the number of hash entries in a hash table.
Definition: dbus-hash.c:1408
void * _dbus_hash_iter_get_value(DBusHashIter *iter)
Gets the value of the current entry.
Definition: dbus-hash.c:614
dbus_uint32_t dbus_bool_t
A boolean, valid values are TRUE and FALSE.
Definition: dbus-types.h:35
DBUS_EXPORT dbus_bool_t dbus_timeout_handle(DBusTimeout *timeout)
Calls the timeout handler for this timeout.
Definition: dbus-timeout.c:498
DBusDispatchStatus dbus_connection_dispatch(DBusConnection *connection)
Processes any incoming data.
All currently available data has been processed.
void _dbus_warn(const char *format,...)
Prints a warning message to stderr.
dbus_bool_t _dbus_list_append(DBusList **list, void *data)
Appends a value to the list.
Definition: dbus-list.c:271
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
void _dbus_get_monotonic_time(long *tv_sec, long *tv_usec)
Get current time, as in gettimeofday().
void * _dbus_list_pop_first(DBusList **list)
Removes the first value in the list and returns it.
Definition: dbus-list.c:677
#define _DBUS_N_ELEMENTS(array)
Computes the number of elements in a fixed-size array using sizeof().
#define TRUE
Expands to "1".
A node in a linked list.
Definition: dbus-list.h:34
void _dbus_hash_iter_init(DBusHashTable *table, DBusHashIter *iter)
Initializes a hash table iterator.
Definition: dbus-hash.c:518
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
int _dbus_list_get_length(DBusList **list)
Gets the length of a list.
Definition: dbus-list.c:758
DBusList * _dbus_list_get_first_link(DBusList **list)
Gets the first link in the list.
Definition: dbus-list.c:595
#define FALSE
Expands to "0".
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:733
DBusWatch * _dbus_watch_ref(DBusWatch *watch)
Increments the reference count of a DBusWatch object.
Definition: dbus-watch.c:124
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:642
void dbus_connection_unref(DBusConnection *connection)
Decrements the reference count of a DBusConnection, and finalizes it if the count reaches zero...
Internals of DBusHashTable.
Definition: dbus-hash.c:169
void _dbus_sleep_milliseconds(int milliseconds)
Sleeps the given number of milliseconds.
DBusHashTable * _dbus_hash_table_new(DBusHashType type, DBusFreeFunction key_free_function, DBusFreeFunction value_free_function)
Constructs a new hash table.
Definition: dbus-hash.c:286
void _dbus_timeout_restarted(DBusTimeout *timeout)
Mark timeout as restarted (setting timestamps is responsibility of the event loop).
Definition: dbus-timeout.c:399
DBUS_EXPORT int dbus_timeout_get_interval(DBusTimeout *timeout)
Gets the timeout interval.
Definition: dbus-timeout.c:442