dbus-mainloop.c revision a683a80c409cc4f2e57ba6a3e60d52f91b8657d0 
1/* -*- mode: C; c-file-style: "gnu" -*- */
2/* dbus-mainloop.c  Main loop utility
3 *
4 * Copyright (C) 2003  Red Hat, Inc.
5 *
6 * Licensed under the Academic Free License version 1.2
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to the Free Software
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
21 *
22 */
23
24#include "dbus-mainloop.h"
25
26#ifndef DOXYGEN_SHOULD_SKIP_THIS
27
28#include <dbus/dbus-list.h>
29#include <dbus/dbus-sysdeps.h>
30
31#define MAINLOOP_SPEW 0
32
33struct DBusLoop
34{
35  int refcount;
36  DBusList *callbacks;
37  int callback_list_serial;
38  int watch_count;
39  int timeout_count;
40  int depth; /**< number of recursive runs */
41  DBusList *need_dispatch;
42};
43
44typedef enum
45{
46  CALLBACK_WATCH,
47  CALLBACK_TIMEOUT
48} CallbackType;
49
50typedef struct
51{
52  int refcount;
53  CallbackType type;
54  void *data;
55  DBusFreeFunction free_data_func;
56} Callback;
57
58typedef struct
59{
60  Callback callback;
61  DBusWatchFunction function;
62  DBusWatch *watch;
63  /* last watch handle failed due to OOM */
64  unsigned int last_iteration_oom : 1;
65} WatchCallback;
66
67typedef struct
68{
69  Callback callback;
70  DBusTimeout *timeout;
71  DBusTimeoutFunction function;
72  unsigned long last_tv_sec;
73  unsigned long last_tv_usec;
74} TimeoutCallback;
75
76#define WATCH_CALLBACK(callback)   ((WatchCallback*)callback)
77#define TIMEOUT_CALLBACK(callback) ((TimeoutCallback*)callback)
78
79static WatchCallback*
80watch_callback_new (DBusWatch         *watch,
81                    DBusWatchFunction  function,
82                    void              *data,
83                    DBusFreeFunction   free_data_func)
84{
85  WatchCallback *cb;
86
87  cb = dbus_new (WatchCallback, 1);
88  if (cb == NULL)
89    return NULL;
90
91  cb->watch = watch;
92  cb->function = function;
93  cb->last_iteration_oom = FALSE;
94  cb->callback.refcount = 1;
95  cb->callback.type = CALLBACK_WATCH;
96  cb->callback.data = data;
97  cb->callback.free_data_func = free_data_func;
98
99  return cb;
100}
101
102static TimeoutCallback*
103timeout_callback_new (DBusTimeout         *timeout,
104                      DBusTimeoutFunction  function,
105                      void                *data,
106                      DBusFreeFunction     free_data_func)
107{
108  TimeoutCallback *cb;
109
110  cb = dbus_new (TimeoutCallback, 1);
111  if (cb == NULL)
112    return NULL;
113
114  cb->timeout = timeout;
115  cb->function = function;
116  _dbus_get_current_time (&cb->last_tv_sec,
117                          &cb->last_tv_usec);
118  cb->callback.refcount = 1;
119  cb->callback.type = CALLBACK_TIMEOUT;
120  cb->callback.data = data;
121  cb->callback.free_data_func = free_data_func;
122
123  return cb;
124}
125
126static void
127callback_ref (Callback *cb)
128{
129  _dbus_assert (cb->refcount > 0);
130
131  cb->refcount += 1;
132}
133
134static void
135callback_unref (Callback *cb)
136{
137  _dbus_assert (cb->refcount > 0);
138
139  cb->refcount -= 1;
140
141  if (cb->refcount == 0)
142    {
143      if (cb->free_data_func)
144        (* cb->free_data_func) (cb->data);
145
146      dbus_free (cb);
147    }
148}
149
150static dbus_bool_t
151add_callback (DBusLoop  *loop,
152              Callback *cb)
153{
154  if (!_dbus_list_append (&loop->callbacks, cb))
155    return FALSE;
156
157  loop->callback_list_serial += 1;
158
159  switch (cb->type)
160    {
161    case CALLBACK_WATCH:
162      loop->watch_count += 1;
163      break;
164    case CALLBACK_TIMEOUT:
165      loop->timeout_count += 1;
166      break;
167    }
168
169  return TRUE;
170}
171
172static void
173remove_callback (DBusLoop  *loop,
174                 DBusList *link)
175{
176  Callback *cb = link->data;
177
178  switch (cb->type)
179    {
180    case CALLBACK_WATCH:
181      loop->watch_count -= 1;
182      break;
183    case CALLBACK_TIMEOUT:
184      loop->timeout_count -= 1;
185      break;
186    }
187
188  callback_unref (cb);
189  _dbus_list_remove_link (&loop->callbacks, link);
190  loop->callback_list_serial += 1;
191}
192
193DBusLoop*
194_dbus_loop_new (void)
195{
196  DBusLoop *loop;
197
198  loop = dbus_new0 (DBusLoop, 1);
199  if (loop == NULL)
200    return NULL;
201
202  loop->refcount = 1;
203
204  return loop;
205}
206
207void
208_dbus_loop_ref (DBusLoop *loop)
209{
210  _dbus_assert (loop != NULL);
211  _dbus_assert (loop->refcount > 0);
212
213  loop->refcount += 1;
214}
215
216void
217_dbus_loop_unref (DBusLoop *loop)
218{
219  _dbus_assert (loop != NULL);
220  _dbus_assert (loop->refcount > 0);
221
222  loop->refcount -= 1;
223  if (loop->refcount == 0)
224    {
225      while (loop->need_dispatch)
226        {
227          DBusConnection *connection = _dbus_list_pop_first (&loop->need_dispatch);
228
229          dbus_connection_unref (connection);
230        }
231
232      dbus_free (loop);
233    }
234}
235
236dbus_bool_t
237_dbus_loop_add_watch (DBusLoop          *loop,
238                      DBusWatch        *watch,
239                      DBusWatchFunction  function,
240                      void             *data,
241                      DBusFreeFunction  free_data_func)
242{
243  WatchCallback *wcb;
244
245  wcb = watch_callback_new (watch, function, data, free_data_func);
246  if (wcb == NULL)
247    return FALSE;
248
249  if (!add_callback (loop, (Callback*) wcb))
250    {
251      wcb->callback.free_data_func = NULL; /* don't want to have this side effect */
252      callback_unref ((Callback*) wcb);
253      return FALSE;
254    }
255
256  return TRUE;
257}
258
259void
260_dbus_loop_remove_watch (DBusLoop          *loop,
261                         DBusWatch        *watch,
262                         DBusWatchFunction  function,
263                         void             *data)
264{
265  DBusList *link;
266
267  link = _dbus_list_get_first_link (&loop->callbacks);
268  while (link != NULL)
269    {
270      DBusList *next = _dbus_list_get_next_link (&loop->callbacks, link);
271      Callback *this = link->data;
272
273      if (this->type == CALLBACK_WATCH &&
274          WATCH_CALLBACK (this)->watch == watch &&
275          this->data == data &&
276          WATCH_CALLBACK (this)->function == function)
277        {
278          remove_callback (loop, link);
279
280          return;
281        }
282
283      link = next;
284    }
285
286  _dbus_warn ("could not find watch %p function %p data %p to remove\n",
287              watch, (void *)function, data);
288}
289
290dbus_bool_t
291_dbus_loop_add_timeout (DBusLoop            *loop,
292                        DBusTimeout        *timeout,
293                        DBusTimeoutFunction  function,
294                        void               *data,
295                        DBusFreeFunction    free_data_func)
296{
297  TimeoutCallback *tcb;
298
299  tcb = timeout_callback_new (timeout, function, data, free_data_func);
300  if (tcb == NULL)
301    return FALSE;
302
303  if (!add_callback (loop, (Callback*) tcb))
304    {
305      tcb->callback.free_data_func = NULL; /* don't want to have this side effect */
306      callback_unref ((Callback*) tcb);
307      return FALSE;
308    }
309
310  return TRUE;
311}
312
313void
314_dbus_loop_remove_timeout (DBusLoop            *loop,
315                           DBusTimeout        *timeout,
316                           DBusTimeoutFunction  function,
317                           void               *data)
318{
319  DBusList *link;
320
321  link = _dbus_list_get_first_link (&loop->callbacks);
322  while (link != NULL)
323    {
324      DBusList *next = _dbus_list_get_next_link (&loop->callbacks, link);
325      Callback *this = link->data;
326
327      if (this->type == CALLBACK_TIMEOUT &&
328          TIMEOUT_CALLBACK (this)->timeout == timeout &&
329          this->data == data &&
330          TIMEOUT_CALLBACK (this)->function == function)
331        {
332          remove_callback (loop, link);
333
334          return;
335        }
336
337      link = next;
338    }
339
340  _dbus_warn ("could not find timeout %p function %p data %p to remove\n",
341              timeout, (void *)function, data);
342}
343
344/* Convolutions from GLib, there really must be a better way
345 * to do this.
346 */
347static dbus_bool_t
348check_timeout (unsigned long    tv_sec,
349               unsigned long    tv_usec,
350               TimeoutCallback *tcb,
351               int             *timeout)
352{
353  long sec_remaining;
354  long msec_remaining;
355  unsigned long expiration_tv_sec;
356  unsigned long expiration_tv_usec;
357  long interval_seconds;
358  long interval_milliseconds;
359  int interval;
360
361  /* I'm pretty sure this function could suck (a lot) less */
362
363  interval = dbus_timeout_get_interval (tcb->timeout);
364
365  interval_seconds = interval / 1000L;
366  interval_milliseconds = interval % 1000L;
367
368  expiration_tv_sec = tcb->last_tv_sec + interval_seconds;
369  expiration_tv_usec = tcb->last_tv_usec + interval_milliseconds * 1000;
370  if (expiration_tv_usec >= 1000000)
371    {
372      expiration_tv_usec -= 1000000;
373      expiration_tv_sec += 1;
374    }
375
376  sec_remaining = expiration_tv_sec - tv_sec;
377  /* need to force this to be signed, as it is intended to sometimes
378   * produce a negative result
379   */
380  msec_remaining = ((long) expiration_tv_usec - (long) tv_usec) / 1000L;
381
382#if MAINLOOP_SPEW
383  _dbus_verbose ("Interval is %ld seconds %ld msecs\n",
384                 interval_seconds,
385                 interval_milliseconds);
386  _dbus_verbose ("Now is  %lu seconds %lu usecs\n",
387                 tv_sec, tv_usec);
388  _dbus_verbose ("Last is %lu seconds %lu usecs\n",
389                 tcb->last_tv_sec, tcb->last_tv_usec);
390  _dbus_verbose ("Exp is  %lu seconds %lu usecs\n",
391                 expiration_tv_sec, expiration_tv_usec);
392  _dbus_verbose ("Pre-correction, sec_remaining %ld msec_remaining %ld\n",
393                 sec_remaining, msec_remaining);
394#endif
395
396  /* We do the following in a rather convoluted fashion to deal with
397   * the fact that we don't have an integral type big enough to hold
398   * the difference of two timevals in milliseconds.
399   */
400  if (sec_remaining < 0 || (sec_remaining == 0 && msec_remaining < 0))
401    {
402      *timeout = 0;
403    }
404  else
405    {
406      if (msec_remaining < 0)
407	{
408	  msec_remaining += 1000;
409	  sec_remaining -= 1;
410	}
411
412      if (sec_remaining > (_DBUS_INT_MAX / 1000) ||
413          msec_remaining > _DBUS_INT_MAX)
414        *timeout = _DBUS_INT_MAX;
415      else
416        *timeout = sec_remaining * 1000 + msec_remaining;
417    }
418
419  if (*timeout > interval)
420    {
421      /* This indicates that the system clock probably moved backward */
422      _dbus_verbose ("System clock set backward! Resetting timeout.\n");
423
424      tcb->last_tv_sec = tv_sec;
425      tcb->last_tv_usec = tv_usec;
426
427      *timeout = interval;
428    }
429
430#if MAINLOOP_SPEW
431  _dbus_verbose ("  timeout expires in %d milliseconds\n", *timeout);
432#endif
433
434  return *timeout == 0;
435}
436
437dbus_bool_t
438_dbus_loop_dispatch (DBusLoop *loop)
439{
440
441#if MAINLOOP_SPEW
442  _dbus_verbose ("  %d connections to dispatch\n", _dbus_list_get_length (&loop->need_dispatch));
443#endif
444
445  if (loop->need_dispatch == NULL)
446    return FALSE;
447
448 next:
449  while (loop->need_dispatch != NULL)
450    {
451      DBusConnection *connection = _dbus_list_pop_first (&loop->need_dispatch);
452
453      while (TRUE)
454        {
455          DBusDispatchStatus status;
456
457          status = dbus_connection_dispatch (connection);
458
459          if (status == DBUS_DISPATCH_COMPLETE)
460            {
461              dbus_connection_unref (connection);
462              goto next;
463            }
464          else
465            {
466              if (status == DBUS_DISPATCH_NEED_MEMORY)
467                _dbus_wait_for_memory ();
468            }
469        }
470    }
471
472  return TRUE;
473}
474
475dbus_bool_t
476_dbus_loop_queue_dispatch (DBusLoop       *loop,
477                           DBusConnection *connection)
478{
479  if (_dbus_list_append (&loop->need_dispatch, connection))
480    {
481      dbus_connection_ref (connection);
482      return TRUE;
483    }
484  else
485    return FALSE;
486}
487
488/* Returns TRUE if we invoked any timeouts or have ready file
489 * descriptors, which is just used in test code as a debug hack
490 */
491
492dbus_bool_t
493_dbus_loop_iterate (DBusLoop     *loop,
494                    dbus_bool_t   block)
495{
496#define N_STACK_DESCRIPTORS 64
497  dbus_bool_t retval;
498  DBusPollFD *fds;
499  DBusPollFD stack_fds[N_STACK_DESCRIPTORS];
500  int n_fds;
501  WatchCallback **watches_for_fds;
502  WatchCallback *stack_watches_for_fds[N_STACK_DESCRIPTORS];
503  int i;
504  DBusList *link;
505  int n_ready;
506  int initial_serial;
507  long timeout;
508  dbus_bool_t oom_watch_pending;
509  int orig_depth;
510
511  retval = FALSE;
512
513  fds = NULL;
514  watches_for_fds = NULL;
515  n_fds = 0;
516  oom_watch_pending = FALSE;
517  orig_depth = loop->depth;
518
519#if MAINLOOP_SPEW
520  _dbus_verbose ("Iteration block=%d depth=%d timeout_count=%d watch_count=%d\n",
521                 block, loop->depth, loop->timeout_count, loop->watch_count);
522#endif
523
524  if (loop->callbacks == NULL)
525    goto next_iteration;
526
527  if (loop->watch_count > N_STACK_DESCRIPTORS)
528    {
529      fds = dbus_new0 (DBusPollFD, loop->watch_count);
530
531      while (fds == NULL)
532        {
533          _dbus_wait_for_memory ();
534          fds = dbus_new0 (DBusPollFD, loop->watch_count);
535        }
536
537      watches_for_fds = dbus_new (WatchCallback*, loop->watch_count);
538      while (watches_for_fds == NULL)
539        {
540          _dbus_wait_for_memory ();
541          watches_for_fds = dbus_new (WatchCallback*, loop->watch_count);
542        }
543    }
544  else
545    {
546      fds = stack_fds;
547      watches_for_fds = stack_watches_for_fds;
548    }
549
550  /* fill our array of fds and watches */
551  n_fds = 0;
552  link = _dbus_list_get_first_link (&loop->callbacks);
553  while (link != NULL)
554    {
555      DBusList *next = _dbus_list_get_next_link (&loop->callbacks, link);
556      Callback *cb = link->data;
557      if (cb->type == CALLBACK_WATCH)
558        {
559          unsigned int flags;
560          WatchCallback *wcb = WATCH_CALLBACK (cb);
561
562          if (wcb->last_iteration_oom)
563            {
564              /* we skip this one this time, but reenable it next time,
565               * and have a timeout on this iteration
566               */
567              wcb->last_iteration_oom = FALSE;
568              oom_watch_pending = TRUE;
569
570              retval = TRUE; /* return TRUE here to keep the loop going,
571                              * since we don't know the watch is inactive
572                              */
573
574#if MAINLOOP_SPEW
575              _dbus_verbose ("  skipping watch on fd %d as it was out of memory last time\n",
576                             dbus_watch_get_fd (wcb->watch));
577#endif
578            }
579          else if (dbus_watch_get_enabled (wcb->watch))
580            {
581              watches_for_fds[n_fds] = wcb;
582
583              callback_ref (cb);
584
585              flags = dbus_watch_get_flags (wcb->watch);
586
587              fds[n_fds].fd = dbus_watch_get_fd (wcb->watch);
588              fds[n_fds].revents = 0;
589              fds[n_fds].events = 0;
590              if (flags & DBUS_WATCH_READABLE)
591                fds[n_fds].events |= _DBUS_POLLIN;
592              if (flags & DBUS_WATCH_WRITABLE)
593                fds[n_fds].events |= _DBUS_POLLOUT;
594
595#if MAINLOOP_SPEW
596              _dbus_verbose ("  polling watch on fd %d\n", fds[n_fds].fd);
597#endif
598
599              n_fds += 1;
600            }
601          else
602            {
603#if MAINLOOP_SPEW
604              _dbus_verbose ("  skipping disabled watch on fd %d\n",
605                             dbus_watch_get_fd (wcb->watch));
606#endif
607            }
608        }
609
610      link = next;
611    }
612
613  timeout = -1;
614  if (loop->timeout_count > 0)
615    {
616      unsigned long tv_sec;
617      unsigned long tv_usec;
618
619      _dbus_get_current_time (&tv_sec, &tv_usec);
620
621      link = _dbus_list_get_first_link (&loop->callbacks);
622      while (link != NULL)
623        {
624          DBusList *next = _dbus_list_get_next_link (&loop->callbacks, link);
625          Callback *cb = link->data;
626
627          if (cb->type == CALLBACK_TIMEOUT &&
628              dbus_timeout_get_enabled (TIMEOUT_CALLBACK (cb)->timeout))
629            {
630              TimeoutCallback *tcb = TIMEOUT_CALLBACK (cb);
631              int msecs_remaining;
632
633              check_timeout (tv_sec, tv_usec, tcb, &msecs_remaining);
634
635              if (timeout < 0)
636                timeout = msecs_remaining;
637              else
638                timeout = MIN (msecs_remaining, timeout);
639
640#if MAINLOOP_SPEW
641              _dbus_verbose ("  timeout added, %d remaining, aggregate timeout %ld\n",
642                             msecs_remaining, timeout);
643#endif
644
645              _dbus_assert (timeout >= 0);
646
647              if (timeout == 0)
648                break; /* it's not going to get shorter... */
649            }
650#if MAINLOOP_SPEW
651          else if (cb->type == CALLBACK_TIMEOUT)
652            {
653              _dbus_verbose ("  skipping disabled timeout\n");
654            }
655#endif
656
657          link = next;
658        }
659    }
660
661  /* Never block if we have stuff to dispatch */
662  if (!block || loop->need_dispatch != NULL)
663    {
664      timeout = 0;
665#if MAINLOOP_SPEW
666      _dbus_verbose ("  timeout is 0 as we aren't blocking\n");
667#endif
668    }
669
670  /* if a watch is OOM, don't wait longer than the OOM
671   * wait to re-enable it
672   */
673  if (oom_watch_pending)
674    timeout = MIN (timeout, _dbus_get_oom_wait ());
675
676#if MAINLOOP_SPEW
677  _dbus_verbose ("  polling on %d descriptors timeout %ld\n", n_fds, timeout);
678#endif
679
680  n_ready = _dbus_poll (fds, n_fds, timeout);
681
682  initial_serial = loop->callback_list_serial;
683
684  if (loop->timeout_count > 0)
685    {
686      unsigned long tv_sec;
687      unsigned long tv_usec;
688
689      _dbus_get_current_time (&tv_sec, &tv_usec);
690
691      /* It'd be nice to avoid this O(n) thingy here */
692      link = _dbus_list_get_first_link (&loop->callbacks);
693      while (link != NULL)
694        {
695          DBusList *next = _dbus_list_get_next_link (&loop->callbacks, link);
696          Callback *cb = link->data;
697
698          if (initial_serial != loop->callback_list_serial)
699            goto next_iteration;
700
701          if (loop->depth != orig_depth)
702            goto next_iteration;
703
704          if (cb->type == CALLBACK_TIMEOUT &&
705              dbus_timeout_get_enabled (TIMEOUT_CALLBACK (cb)->timeout))
706            {
707              TimeoutCallback *tcb = TIMEOUT_CALLBACK (cb);
708              int msecs_remaining;
709
710              if (check_timeout (tv_sec, tv_usec,
711                                 tcb, &msecs_remaining))
712                {
713                  /* Save last callback time and fire this timeout */
714                  tcb->last_tv_sec = tv_sec;
715                  tcb->last_tv_usec = tv_usec;
716
717#if MAINLOOP_SPEW
718                  _dbus_verbose ("  invoking timeout\n");
719#endif
720
721                  (* tcb->function) (tcb->timeout,
722                                     cb->data);
723
724                  retval = TRUE;
725                }
726              else
727                {
728#if MAINLOOP_SPEW
729                  _dbus_verbose ("  timeout has not expired\n");
730#endif
731                }
732            }
733#if MAINLOOP_SPEW
734          else if (cb->type == CALLBACK_TIMEOUT)
735            {
736              _dbus_verbose ("  skipping invocation of disabled timeout\n");
737            }
738#endif
739
740          link = next;
741        }
742    }
743
744  if (n_ready > 0)
745    {
746      i = 0;
747      while (i < n_fds)
748        {
749          /* FIXME I think this "restart if we change the watches"
750           * approach could result in starving watches
751           * toward the end of the list.
752           */
753          if (initial_serial != loop->callback_list_serial)
754            goto next_iteration;
755
756          if (loop->depth != orig_depth)
757            goto next_iteration;
758
759          if (fds[i].revents != 0)
760            {
761              WatchCallback *wcb;
762              unsigned int condition;
763
764              wcb = watches_for_fds[i];
765
766              condition = 0;
767              if (fds[i].revents & _DBUS_POLLIN)
768                condition |= DBUS_WATCH_READABLE;
769              if (fds[i].revents & _DBUS_POLLOUT)
770                condition |= DBUS_WATCH_WRITABLE;
771              if (fds[i].revents & _DBUS_POLLHUP)
772                condition |= DBUS_WATCH_HANGUP;
773              if (fds[i].revents & _DBUS_POLLERR)
774                condition |= DBUS_WATCH_ERROR;
775
776              /* condition may still be 0 if we got some
777               * weird POLLFOO thing like POLLWRBAND
778               */
779
780              if (condition != 0 &&
781                  dbus_watch_get_enabled (wcb->watch))
782                {
783                  if (!(* wcb->function) (wcb->watch,
784                                          condition,
785                                          ((Callback*)wcb)->data))
786                    wcb->last_iteration_oom = TRUE;
787
788#if MAINLOOP_SPEW
789                  _dbus_verbose ("  Invoked watch, oom = %d\n",
790                                 wcb->last_iteration_oom);
791#endif
792
793                  retval = TRUE;
794                }
795            }
796
797          ++i;
798        }
799    }
800
801 next_iteration:
802#if MAINLOOP_SPEW
803  _dbus_verbose ("  moving to next iteration\n");
804#endif
805
806  if (fds && fds != stack_fds)
807    dbus_free (fds);
808  if (watches_for_fds)
809    {
810      i = 0;
811      while (i < n_fds)
812        {
813          callback_unref (&watches_for_fds[i]->callback);
814          ++i;
815        }
816
817      if (watches_for_fds != stack_watches_for_fds)
818        dbus_free (watches_for_fds);
819    }
820
821  if (_dbus_loop_dispatch (loop))
822    retval = TRUE;
823
824#if MAINLOOP_SPEW
825  _dbus_verbose ("Returning %d\n", retval);
826#endif
827
828  return retval;
829}
830
831void
832_dbus_loop_run (DBusLoop *loop)
833{
834  int our_exit_depth;
835
836  _dbus_assert (loop->depth >= 0);
837
838  _dbus_loop_ref (loop);
839
840  our_exit_depth = loop->depth;
841  loop->depth += 1;
842
843  _dbus_verbose ("Running main loop, depth %d -> %d\n",
844                 loop->depth - 1, loop->depth);
845
846  while (loop->depth != our_exit_depth)
847    _dbus_loop_iterate (loop, TRUE);
848
849  _dbus_loop_unref (loop);
850}
851
852void
853_dbus_loop_quit (DBusLoop *loop)
854{
855  _dbus_assert (loop->depth > 0);
856
857  loop->depth -= 1;
858
859  _dbus_verbose ("Quit main loop, depth %d -> %d\n",
860                 loop->depth + 1, loop->depth);
861}
862
863int
864_dbus_get_oom_wait (void)
865{
866#ifdef DBUS_BUILD_TESTS
867  /* make tests go fast */
868  return 0;
869#else
870  return 500;
871#endif
872}
873
874void
875_dbus_wait_for_memory (void)
876{
877  _dbus_verbose ("Waiting for more memory\n");
878  _dbus_sleep_milliseconds (_dbus_get_oom_wait ());
879}
880
881#endif /* DOXYGEN_SHOULD_SKIP_THIS */
882