D-Bus  1.10.24
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  long last_tv_sec;
58  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_POLLABLE, 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  DBusPollable fd)
173 {
174  DBusList **watches;
175 
176  watches = _dbus_hash_table_lookup_pollable (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_pollable (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  DBusPollable fd)
198 {
199  DBusList *link;
200  DBusList **watches;
201 
202  _dbus_warn ("invalid request, socket fd %" DBUS_POLLABLE_FORMAT " not open\n",
203  _dbus_pollable_printable (fd));
204  watches = _dbus_hash_table_lookup_pollable (loop->watches, fd);
205 
206  if (watches != NULL)
207  {
208  for (link = _dbus_list_get_first_link (watches);
209  link != NULL;
210  link = _dbus_list_get_next_link (watches, link))
212  }
213 
214  _dbus_hash_table_remove_pollable (loop->watches, fd);
215 }
216 
217 static dbus_bool_t
218 gc_watch_table_entry (DBusLoop *loop,
219  DBusList **watches,
220  DBusPollable fd)
221 {
222  /* If watches is already NULL we have nothing to do */
223  if (watches == NULL)
224  return FALSE;
225 
226  /* We can't GC hash table entries if they're non-empty lists */
227  if (*watches != NULL)
228  return FALSE;
229 
230  _dbus_hash_table_remove_pollable (loop->watches, fd);
231  return TRUE;
232 }
233 
234 static void
235 refresh_watches_for_fd (DBusLoop *loop,
236  DBusList **watches,
237  DBusPollable fd)
238 {
239  DBusList *link;
240  unsigned int flags = 0;
241  dbus_bool_t interested = FALSE;
242 
243  _dbus_assert (_dbus_pollable_is_valid (fd));
244 
245  if (watches == NULL)
246  watches = _dbus_hash_table_lookup_pollable (loop->watches, fd);
247 
248  /* we allocated this in the first _dbus_loop_add_watch for the fd, and keep
249  * it until there are none left */
250  _dbus_assert (watches != NULL);
251 
252  for (link = _dbus_list_get_first_link (watches);
253  link != NULL;
254  link = _dbus_list_get_next_link (watches, link))
255  {
256  if (dbus_watch_get_enabled (link->data) &&
257  !_dbus_watch_get_oom_last_time (link->data))
258  {
259  flags |= dbus_watch_get_flags (link->data);
260  interested = TRUE;
261  }
262  }
263 
264  if (interested)
265  _dbus_socket_set_enable (loop->socket_set, fd, flags);
266  else
267  _dbus_socket_set_disable (loop->socket_set, fd);
268 }
269 
271 _dbus_loop_add_watch (DBusLoop *loop,
272  DBusWatch *watch)
273 {
274  DBusPollable fd;
275  DBusList **watches;
276 
277  fd = _dbus_watch_get_pollable (watch);
278  _dbus_assert (_dbus_pollable_is_valid (fd));
279 
280  watches = ensure_watch_table_entry (loop, fd);
281 
282  if (watches == NULL)
283  return FALSE;
284 
285  if (!_dbus_list_append (watches, _dbus_watch_ref (watch)))
286  {
287  _dbus_watch_unref (watch);
288  gc_watch_table_entry (loop, watches, fd);
289 
290  return FALSE;
291  }
292 
293  if (_dbus_list_length_is_one (watches))
294  {
295  if (!_dbus_socket_set_add (loop->socket_set, fd,
296  dbus_watch_get_flags (watch),
297  dbus_watch_get_enabled (watch)))
298  {
299  _dbus_hash_table_remove_pollable (loop->watches, fd);
300  return FALSE;
301  }
302  }
303  else
304  {
305  /* we're modifying, not adding, which can't fail with OOM */
306  refresh_watches_for_fd (loop, watches, fd);
307  }
308 
309  loop->callback_list_serial += 1;
310  loop->watch_count += 1;
311  return TRUE;
312 }
313 
314 void
315 _dbus_loop_toggle_watch (DBusLoop *loop,
316  DBusWatch *watch)
317 {
318  refresh_watches_for_fd (loop, NULL, _dbus_watch_get_pollable (watch));
319 }
320 
321 void
322 _dbus_loop_remove_watch (DBusLoop *loop,
323  DBusWatch *watch)
324 {
325  DBusList **watches;
326  DBusList *link;
327  DBusPollable fd;
328 
329  /* This relies on people removing watches before they invalidate them,
330  * which has been safe since fd.o #33336 was fixed. Assert about it
331  * so we don't regress. */
332  fd = _dbus_watch_get_pollable (watch);
333  _dbus_assert (_dbus_pollable_is_valid (fd));
334 
335  watches = _dbus_hash_table_lookup_pollable (loop->watches, fd);
336 
337  if (watches != NULL)
338  {
339  link = _dbus_list_get_first_link (watches);
340  while (link != NULL)
341  {
342  DBusList *next = _dbus_list_get_next_link (watches, link);
343  DBusWatch *this = link->data;
344 
345  if (this == watch)
346  {
347  _dbus_list_remove_link (watches, link);
348  loop->callback_list_serial += 1;
349  loop->watch_count -= 1;
350  _dbus_watch_unref (this);
351 
352  /* if that was the last watch for that fd, drop the hash table
353  * entry, and stop reserving space for it in the socket set */
354  if (gc_watch_table_entry (loop, watches, fd))
355  {
356  _dbus_socket_set_remove (loop->socket_set, fd);
357  }
358 
359  return;
360  }
361 
362  link = next;
363  }
364  }
365 
366  _dbus_warn ("could not find watch %p to remove\n", watch);
367 }
368 
370 _dbus_loop_add_timeout (DBusLoop *loop,
371  DBusTimeout *timeout)
372 {
373  TimeoutCallback *tcb;
374 
375  tcb = timeout_callback_new (timeout);
376  if (tcb == NULL)
377  return FALSE;
378 
379  if (_dbus_list_append (&loop->timeouts, tcb))
380  {
381  loop->callback_list_serial += 1;
382  loop->timeout_count += 1;
383  }
384  else
385  {
386  timeout_callback_free (tcb);
387  return FALSE;
388  }
389 
390  return TRUE;
391 }
392 
393 void
394 _dbus_loop_remove_timeout (DBusLoop *loop,
395  DBusTimeout *timeout)
396 {
397  DBusList *link;
398 
399  link = _dbus_list_get_first_link (&loop->timeouts);
400  while (link != NULL)
401  {
402  DBusList *next = _dbus_list_get_next_link (&loop->timeouts, link);
403  TimeoutCallback *this = link->data;
404 
405  if (this->timeout == timeout)
406  {
407  _dbus_list_remove_link (&loop->timeouts, link);
408  loop->callback_list_serial += 1;
409  loop->timeout_count -= 1;
410  timeout_callback_free (this);
411 
412  return;
413  }
414 
415  link = next;
416  }
417 
418  _dbus_warn ("could not find timeout %p to remove\n", timeout);
419 }
420 
421 /* Convolutions from GLib, there really must be a better way
422  * to do this.
423  */
424 static dbus_bool_t
425 check_timeout (long tv_sec,
426  long tv_usec,
427  TimeoutCallback *tcb,
428  int *timeout)
429 {
430  long sec_remaining;
431  long msec_remaining;
432  long expiration_tv_sec;
433  long expiration_tv_usec;
434  long interval_seconds;
435  long interval_milliseconds;
436  int interval;
437 
438  /* I'm pretty sure this function could suck (a lot) less */
439 
440  interval = dbus_timeout_get_interval (tcb->timeout);
441 
442  interval_seconds = interval / 1000L;
443  interval_milliseconds = interval % 1000L;
444 
445  expiration_tv_sec = tcb->last_tv_sec + interval_seconds;
446  expiration_tv_usec = tcb->last_tv_usec + interval_milliseconds * 1000;
447  if (expiration_tv_usec >= 1000000)
448  {
449  expiration_tv_usec -= 1000000;
450  expiration_tv_sec += 1;
451  }
452 
453  sec_remaining = expiration_tv_sec - tv_sec;
454  msec_remaining = (expiration_tv_usec - tv_usec) / 1000L;
455 
456 #if MAINLOOP_SPEW
457  _dbus_verbose ("Interval is %ld seconds %ld msecs\n",
458  interval_seconds,
459  interval_milliseconds);
460  _dbus_verbose ("Now is %lu seconds %lu usecs\n",
461  tv_sec, tv_usec);
462  _dbus_verbose ("Last is %lu seconds %lu usecs\n",
463  tcb->last_tv_sec, tcb->last_tv_usec);
464  _dbus_verbose ("Exp is %lu seconds %lu usecs\n",
465  expiration_tv_sec, expiration_tv_usec);
466  _dbus_verbose ("Pre-correction, sec_remaining %ld msec_remaining %ld\n",
467  sec_remaining, msec_remaining);
468 #endif
469 
470  /* We do the following in a rather convoluted fashion to deal with
471  * the fact that we don't have an integral type big enough to hold
472  * the difference of two timevals in milliseconds.
473  */
474  if (sec_remaining < 0 || (sec_remaining == 0 && msec_remaining < 0))
475  {
476  *timeout = 0;
477  }
478  else
479  {
480  if (msec_remaining < 0)
481  {
482  msec_remaining += 1000;
483  sec_remaining -= 1;
484  }
485 
486  if (sec_remaining > (_DBUS_INT_MAX / 1000) ||
487  msec_remaining > _DBUS_INT_MAX)
488  *timeout = _DBUS_INT_MAX;
489  else
490  *timeout = sec_remaining * 1000 + msec_remaining;
491  }
492 
493  if (*timeout > interval)
494  {
495  /* This indicates that the system clock probably moved backward */
496  _dbus_verbose ("System clock set backward! Resetting timeout.\n");
497 
498  tcb->last_tv_sec = tv_sec;
499  tcb->last_tv_usec = tv_usec;
500 
501  *timeout = interval;
502  }
503 
504 #if MAINLOOP_SPEW
505  _dbus_verbose (" timeout expires in %d milliseconds\n", *timeout);
506 #endif
507 
508  return *timeout == 0;
509 }
510 
512 _dbus_loop_dispatch (DBusLoop *loop)
513 {
514 
515 #if MAINLOOP_SPEW
516  _dbus_verbose (" %d connections to dispatch\n", _dbus_list_get_length (&loop->need_dispatch));
517 #endif
518 
519  if (loop->need_dispatch == NULL)
520  return FALSE;
521 
522  next:
523  while (loop->need_dispatch != NULL)
524  {
525  DBusConnection *connection = _dbus_list_pop_first (&loop->need_dispatch);
526 
527  while (TRUE)
528  {
529  DBusDispatchStatus status;
530 
531  status = dbus_connection_dispatch (connection);
532 
533  if (status == DBUS_DISPATCH_COMPLETE)
534  {
535  dbus_connection_unref (connection);
536  goto next;
537  }
538  else
539  {
540  if (status == DBUS_DISPATCH_NEED_MEMORY)
541  _dbus_wait_for_memory ();
542  }
543  }
544  }
545 
546  return TRUE;
547 }
548 
550 _dbus_loop_queue_dispatch (DBusLoop *loop,
551  DBusConnection *connection)
552 {
553  if (_dbus_list_append (&loop->need_dispatch, connection))
554  {
555  dbus_connection_ref (connection);
556  return TRUE;
557  }
558  else
559  return FALSE;
560 }
561 
562 /* Returns TRUE if we invoked any timeouts or have ready file
563  * descriptors, which is just used in test code as a debug hack
564  */
565 
567 _dbus_loop_iterate (DBusLoop *loop,
568  dbus_bool_t block)
569 {
570 #define N_STACK_DESCRIPTORS 64
571  dbus_bool_t retval;
572  DBusSocketEvent ready_fds[N_STACK_DESCRIPTORS];
573  int i;
574  DBusList *link;
575  int n_ready;
576  int initial_serial;
577  long timeout;
578  int orig_depth;
579 
580  retval = FALSE;
581 
582  orig_depth = loop->depth;
583 
584 #if MAINLOOP_SPEW
585  _dbus_verbose ("Iteration block=%d depth=%d timeout_count=%d watch_count=%d\n",
586  block, loop->depth, loop->timeout_count, loop->watch_count);
587 #endif
588 
589  if (_dbus_hash_table_get_n_entries (loop->watches) == 0 &&
590  loop->timeouts == NULL)
591  goto next_iteration;
592 
593  timeout = -1;
594  if (loop->timeout_count > 0)
595  {
596  long tv_sec;
597  long tv_usec;
598 
599  _dbus_get_monotonic_time (&tv_sec, &tv_usec);
600 
601  link = _dbus_list_get_first_link (&loop->timeouts);
602  while (link != NULL)
603  {
604  DBusList *next = _dbus_list_get_next_link (&loop->timeouts, link);
605  TimeoutCallback *tcb = link->data;
606 
607  if (dbus_timeout_get_enabled (tcb->timeout))
608  {
609  int msecs_remaining;
610 
611  check_timeout (tv_sec, tv_usec, tcb, &msecs_remaining);
612 
613  if (timeout < 0)
614  timeout = msecs_remaining;
615  else
616  timeout = MIN (msecs_remaining, timeout);
617 
618 #if MAINLOOP_SPEW
619  _dbus_verbose (" timeout added, %d remaining, aggregate timeout %ld\n",
620  msecs_remaining, timeout);
621 #endif
622 
623  _dbus_assert (timeout >= 0);
624 
625  if (timeout == 0)
626  break; /* it's not going to get shorter... */
627  }
628 #if MAINLOOP_SPEW
629  else
630  {
631  _dbus_verbose (" skipping disabled timeout\n");
632  }
633 #endif
634 
635  link = next;
636  }
637  }
638 
639  /* Never block if we have stuff to dispatch */
640  if (!block || loop->need_dispatch != NULL)
641  {
642  timeout = 0;
643 #if MAINLOOP_SPEW
644  _dbus_verbose (" timeout is 0 as we aren't blocking\n");
645 #endif
646  }
647 
648  /* if a watch was OOM last time, don't wait longer than the OOM
649  * wait to re-enable it
650  */
651  if (loop->oom_watch_pending)
652  timeout = MIN (timeout, _dbus_get_oom_wait ());
653 
654 #if MAINLOOP_SPEW
655  _dbus_verbose (" polling on %d descriptors timeout %ld\n", _DBUS_N_ELEMENTS (ready_fds), timeout);
656 #endif
657 
658  n_ready = _dbus_socket_set_poll (loop->socket_set, ready_fds,
659  _DBUS_N_ELEMENTS (ready_fds), timeout);
660 
661  /* re-enable any watches we skipped this time */
662  if (loop->oom_watch_pending)
663  {
664  DBusHashIter hash_iter;
665 
666  loop->oom_watch_pending = FALSE;
667 
668  _dbus_hash_iter_init (loop->watches, &hash_iter);
669 
670  while (_dbus_hash_iter_next (&hash_iter))
671  {
672  DBusList **watches;
673  DBusPollable fd;
674  dbus_bool_t changed;
675 
676  changed = FALSE;
677  fd = _dbus_hash_iter_get_pollable_key (&hash_iter);
678  watches = _dbus_hash_iter_get_value (&hash_iter);
679 
680  for (link = _dbus_list_get_first_link (watches);
681  link != NULL;
682  link = _dbus_list_get_next_link (watches, link))
683  {
684  DBusWatch *watch = link->data;
685 
686  if (_dbus_watch_get_oom_last_time (watch))
687  {
688  _dbus_watch_set_oom_last_time (watch, FALSE);
689  changed = TRUE;
690  }
691  }
692 
693  if (changed)
694  refresh_watches_for_fd (loop, watches, fd);
695  }
696 
697  retval = TRUE; /* return TRUE here to keep the loop going,
698  * since we don't know the watch was inactive */
699  }
700 
701  initial_serial = loop->callback_list_serial;
702 
703  if (loop->timeout_count > 0)
704  {
705  long tv_sec;
706  long tv_usec;
707 
708  _dbus_get_monotonic_time (&tv_sec, &tv_usec);
709 
710  /* It'd be nice to avoid this O(n) thingy here */
711  link = _dbus_list_get_first_link (&loop->timeouts);
712  while (link != NULL)
713  {
714  DBusList *next = _dbus_list_get_next_link (&loop->timeouts, link);
715  TimeoutCallback *tcb = link->data;
716 
717  if (initial_serial != loop->callback_list_serial)
718  goto next_iteration;
719 
720  if (loop->depth != orig_depth)
721  goto next_iteration;
722 
723  if (dbus_timeout_get_enabled (tcb->timeout))
724  {
725  int msecs_remaining;
726 
727  if (check_timeout (tv_sec, tv_usec,
728  tcb, &msecs_remaining))
729  {
730  /* Save last callback time and fire this timeout */
731  tcb->last_tv_sec = tv_sec;
732  tcb->last_tv_usec = tv_usec;
733 
734 #if MAINLOOP_SPEW
735  _dbus_verbose (" invoking timeout\n");
736 #endif
737 
738  /* can theoretically return FALSE on OOM, but we just
739  * let it fire again later - in practice that's what
740  * every wrapper callback in dbus-daemon used to do */
741  dbus_timeout_handle (tcb->timeout);
742 
743  retval = TRUE;
744  }
745  else
746  {
747 #if MAINLOOP_SPEW
748  _dbus_verbose (" timeout has not expired\n");
749 #endif
750  }
751  }
752 #if MAINLOOP_SPEW
753  else
754  {
755  _dbus_verbose (" skipping invocation of disabled timeout\n");
756  }
757 #endif
758 
759  link = next;
760  }
761  }
762 
763  if (n_ready > 0)
764  {
765  for (i = 0; i < n_ready; i++)
766  {
767  DBusList **watches;
768  DBusList *next;
769  unsigned int condition;
770  dbus_bool_t any_oom;
771 
772  /* FIXME I think this "restart if we change the watches"
773  * approach could result in starving watches
774  * toward the end of the list.
775  */
776  if (initial_serial != loop->callback_list_serial)
777  goto next_iteration;
778 
779  if (loop->depth != orig_depth)
780  goto next_iteration;
781 
782  _dbus_assert (ready_fds[i].flags != 0);
783 
784  if (_DBUS_UNLIKELY (ready_fds[i].flags & _DBUS_WATCH_NVAL))
785  {
786  cull_watches_for_invalid_fd (loop, ready_fds[i].fd);
787  goto next_iteration;
788  }
789 
790  condition = ready_fds[i].flags;
791  _dbus_assert ((condition & _DBUS_WATCH_NVAL) == 0);
792 
793  /* condition may still be 0 if we got some
794  * weird POLLFOO thing like POLLWRBAND
795  */
796  if (condition == 0)
797  continue;
798 
799  watches = _dbus_hash_table_lookup_pollable (loop->watches,
800  ready_fds[i].fd);
801 
802  if (watches == NULL)
803  continue;
804 
805  any_oom = FALSE;
806 
807  for (link = _dbus_list_get_first_link (watches);
808  link != NULL;
809  link = next)
810  {
811  DBusWatch *watch = link->data;
812 
813  next = _dbus_list_get_next_link (watches, link);
814 
815  if (dbus_watch_get_enabled (watch))
816  {
817  dbus_bool_t oom;
818 
819  oom = !dbus_watch_handle (watch, condition);
820 
821  if (oom)
822  {
823  _dbus_watch_set_oom_last_time (watch, TRUE);
824  loop->oom_watch_pending = TRUE;
825  any_oom = TRUE;
826  }
827 
828 #if MAINLOOP_SPEW
829  _dbus_verbose (" Invoked watch, oom = %d\n", oom);
830 #endif
831  retval = TRUE;
832 
833  /* We re-check this every time, in case the callback
834  * added/removed watches, which might make our position in
835  * the linked list invalid. See the FIXME above. */
836  if (initial_serial != loop->callback_list_serial ||
837  loop->depth != orig_depth)
838  {
839  if (any_oom)
840  refresh_watches_for_fd (loop, NULL, ready_fds[i].fd);
841 
842  goto next_iteration;
843  }
844  }
845  }
846 
847  if (any_oom)
848  refresh_watches_for_fd (loop, watches, ready_fds[i].fd);
849  }
850  }
851 
852  next_iteration:
853 #if MAINLOOP_SPEW
854  _dbus_verbose (" moving to next iteration\n");
855 #endif
856 
857  if (_dbus_loop_dispatch (loop))
858  retval = TRUE;
859 
860 #if MAINLOOP_SPEW
861  _dbus_verbose ("Returning %d\n", retval);
862 #endif
863 
864  return retval;
865 }
866 
867 void
868 _dbus_loop_run (DBusLoop *loop)
869 {
870  int our_exit_depth;
871 
872  _dbus_assert (loop->depth >= 0);
873 
874  _dbus_loop_ref (loop);
875 
876  our_exit_depth = loop->depth;
877  loop->depth += 1;
878 
879  _dbus_verbose ("Running main loop, depth %d -> %d\n",
880  loop->depth - 1, loop->depth);
881 
882  while (loop->depth != our_exit_depth)
883  _dbus_loop_iterate (loop, TRUE);
884 
885  _dbus_loop_unref (loop);
886 }
887 
888 void
889 _dbus_loop_quit (DBusLoop *loop)
890 {
891  _dbus_assert (loop->depth > 0);
892 
893  loop->depth -= 1;
894 
895  _dbus_verbose ("Quit main loop, depth %d -> %d\n",
896  loop->depth + 1, loop->depth);
897 }
898 
899 int
900 _dbus_get_oom_wait (void)
901 {
902 #ifdef DBUS_ENABLE_EMBEDDED_TESTS
903  /* make tests go fast */
904  return 0;
905 #else
906  return 500;
907 #endif
908 }
909 
910 void
911 _dbus_wait_for_memory (void)
912 {
913  _dbus_verbose ("Waiting for more memory\n");
914  _dbus_sleep_milliseconds (_dbus_get_oom_wait ());
915 }
916 
917 #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:701
dbus_bool_t _dbus_list_length_is_one(DBusList **list)
Check whether length is exactly one.
Definition: dbus-list.c:783
#define dbus_new(type, count)
Safe macro for using dbus_malloc().
Definition: dbus-memory.h:58
DBUS_EXPORT dbus_bool_t dbus_watch_get_enabled(DBusWatch *watch)
Returns whether a watch is enabled or not.
Definition: dbus-watch.c:703
void _dbus_list_remove_link(DBusList **list, DBusList *link)
Removes a link from the list.
Definition: dbus-list.c:527
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:361
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:543
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:116
#define _DBUS_INT_MAX
Maximum value of type &quot;int&quot;.
DBUS_EXPORT dbus_bool_t dbus_timeout_get_enabled(DBusTimeout *timeout)
Returns whether a timeout is enabled or not.
Definition: dbus-timeout.c:486
#define dbus_new0(type, count)
Safe macro for using dbus_malloc0().
Definition: dbus-memory.h:59
int _dbus_hash_table_get_n_entries(DBusHashTable *table)
Gets the number of hash entries in a hash table.
Definition: dbus-hash.c:1397
void * _dbus_hash_iter_get_value(DBusHashIter *iter)
Gets the value of the current entry.
Definition: dbus-hash.c:613
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:472
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:270
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:649
#define _DBUS_N_ELEMENTS(array)
Computes the number of elements in a fixed-size array using sizeof().
#define TRUE
Expands to &quot;1&quot;.
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:517
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:730
DBusList * _dbus_list_get_first_link(DBusList **list)
Gets the first link in the list.
Definition: dbus-list.c:567
#define FALSE
Expands to &quot;0&quot;.
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:734
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:643
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:168
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:285
DBUS_EXPORT int dbus_timeout_get_interval(DBusTimeout *timeout)
Gets the timeout interval.
Definition: dbus-timeout.c:416