9 #include "gdkprivate-quartz.h"
12 * This file implementations integration between the GLib main loop and
13 * the native system of the Core Foundation run loop and Cocoa event
14 * handling. There are basically two different cases that we need to
15 * handle: either the GLib main loop is in control (the application
16 * has called gtk_main(), or is otherwise iterating the main loop), or
17 * CFRunLoop is in control (we are in a modal operation such as window
18 * resizing or drag-and-drop.)
20 * When the GLib main loop is in control we integrate in native event
21 * handling in two ways: first we add a GSource that handles checking
22 * whether there are native events available, translating native events
23 * to GDK events, and dispatching GDK events. Second we replace the
24 * "poll function" of the GLib main loop with our own version that knows
25 * how to wait for both the file descriptors and timeouts that GLib is
26 * interested in and also for incoming native events.
28 * When CFRunLoop is in control, we integrate in GLib main loop handling
29 * by adding a "run loop observer" that gives us notification at various
30 * points in the run loop cycle. We map these points onto the corresponding
31 * stages of the GLib main loop (prepare, check, dispatch), and make the
32 * appropriate calls into GLib.
34 * Both cases share a single problem: the OS X API's don't allow us to
35 * wait simultaneously for file descriptors and for events. So when we
36 * need to do a blocking wait that includes file descriptor activity, we
37 * push the actual work of calling select() to a helper thread (the
38 * "select thread") and wait for native events in the main thread.
40 * The main known limitation of this code is that if a callback is triggered
41 * via the OS X run loop while we are "polling" (in either case described
42 * above), iteration of the GLib main loop is not possible from within
43 * that callback. If the programmer tries to do so explicitly, then they
44 * will get a warning from GLib "main loop already active in another thread".
47 /******* State for run loop iteration *******/
49 /* Count of number of times we've gotten an "Entry" notification for
50 * our run loop observer.
52 static int current_loop_level = 0;
54 /* Run loop level at which we acquired ownership of the GLib main
55 * loop. See note in run_loop_entry(). -1 means that we don't have
58 static int acquired_loop_level = -1;
60 /* Between run_loop_before_waiting() and run_loop_after_waiting();
61 * whether we we need to call select_thread_collect_poll()
63 static gboolean run_loop_polling_async = FALSE;
65 /* Between run_loop_before_waiting() and run_loop_after_waiting();
66 * max_prioritiy to pass to g_main_loop_check()
68 static gint run_loop_max_priority;
70 /* Timer that we've added to wake up the run loop when a GLib timeout
72 static CFRunLoopTimerRef run_loop_timer = NULL;
74 /* These are the file descriptors that are we are polling out of
75 * the run loop. (We keep the array around and reuse it to avoid
76 * constant allocations.)
78 #define RUN_LOOP_POLLFDS_INITIAL_SIZE 16
79 static GPollFD *run_loop_pollfds;
80 static guint run_loop_pollfds_size; /* Allocated size of the array */
81 static guint run_loop_n_pollfds; /* Number of file descriptors in the array */
83 /******* Other global variables *******/
85 /* Since we count on replacing the GLib main loop poll function as our
86 * method of integrating Cocoa event handling into the GLib main loop
87 * we need to make sure that the poll function is always called even
88 * when there are no file descriptors that need to be polled. To do
89 * this, we add a dummy GPollFD to our event source with a file
90 * descriptor of '-1'. Then any time that GLib is polling the event
91 * source, it will call our poll function.
93 static GPollFD event_poll_fd;
95 /* Current NSEvents that we've gotten from Cocoa but haven't yet converted
96 * to GdkEvents. We wait until our dispatch() function to do the conversion
97 * since the conversion can conceivably cause signals to be emmitted
98 * or other things that shouldn't happen inside a poll function.
100 static GQueue *current_events;
102 /* The default poll function for GLib; we replace this with our own
103 * Cocoa-aware version and then call the old version to do actual
104 * file descriptor polling. There's no actual need to chain to the
105 * old one; we could reimplement the same functionality from scratch,
106 * but since the default implementation does the right thing, why
109 static GPollFunc old_poll_func;
111 /* Reference to the run loop of the main thread. (There is a unique
112 * CFRunLoop per thread.)
114 static CFRunLoopRef main_thread_run_loop;
116 /* Normally the Cocoa main loop maintains an NSAutoReleasePool and frees
117 * it on every iteration. Since we are replacing the main loop we have
118 * to provide this functionality ourself. We free and replace the
119 * auto-release pool in our sources prepare() function.
121 static NSAutoreleasePool *autorelease_pool;
123 /* Flag when we've called nextEventMatchingMask ourself; this triggers
124 * a run loop iteration, so we need to detect that and avoid triggering
125 * our "run the GLib main looop while the run loop is active machinery.
127 static gint getting_events = 0;
129 /************************************************************
130 ********* Select Thread *********
131 ************************************************************/
133 /* The states in our state machine, see comments in select_thread_func()
134 * for descriptiions of each state
144 #ifdef G_ENABLE_DEBUG
145 static const char *const state_names[] = {
150 "POLLING_DESCRIPTORS"
154 static SelectThreadState select_thread_state = BEFORE_START;
156 static pthread_t select_thread;
157 static pthread_mutex_t select_thread_mutex = PTHREAD_MUTEX_INITIALIZER;
158 static pthread_cond_t select_thread_cond = PTHREAD_COND_INITIALIZER;
160 #define SELECT_THREAD_LOCK() pthread_mutex_lock (&select_thread_mutex)
161 #define SELECT_THREAD_UNLOCK() pthread_mutex_unlock (&select_thread_mutex)
162 #define SELECT_THREAD_SIGNAL() pthread_cond_signal (&select_thread_cond)
163 #define SELECT_THREAD_WAIT() pthread_cond_wait (&select_thread_cond, &select_thread_mutex)
165 /* These are the file descriptors that the select thread is currently
168 static GPollFD *current_pollfds;
169 static guint current_n_pollfds;
171 /* These are the file descriptors that the select thread should pick
172 * up and start polling when it has a chance.
174 static GPollFD *next_pollfds;
175 static guint next_n_pollfds;
177 /* Pipe used to wake up the select thread */
178 static gint select_thread_wakeup_pipe[2];
180 /* Run loop source used to wake up the main thread */
181 static CFRunLoopSourceRef select_main_thread_source;
184 select_thread_set_state (SelectThreadState new_state)
188 if (select_thread_state == new_state)
191 GDK_NOTE (EVENTLOOP, g_print ("EventLoop: Select thread state: %s => %s\n", state_names[select_thread_state], state_names[new_state]));
193 old_state = select_thread_state;
194 select_thread_state = new_state;
195 if (old_state == WAITING && new_state != WAITING)
196 SELECT_THREAD_SIGNAL ();
200 signal_main_thread (void)
202 GDK_NOTE (EVENTLOOP, g_print ("EventLoop: Waking up main thread\n"));
204 /* If we are in nextEventMatchingMask, then we need to make sure an
205 * event gets queued, otherwise it's enough to simply wake up the
206 * main thread run loop
208 if (!run_loop_polling_async)
209 CFRunLoopSourceSignal (select_main_thread_source);
211 /* Don't check for CFRunLoopIsWaiting() here because it causes a
212 * race condition (the loop could go into waiting state right after
215 CFRunLoopWakeUp (main_thread_run_loop);
219 select_thread_func (void *arg)
223 SELECT_THREAD_LOCK ();
227 switch (select_thread_state)
230 /* The select thread has not been started yet
232 g_assert_not_reached ();
235 /* Waiting for a set of file descriptors to be submitted by the main thread
237 * => POLLING_QUEUED: main thread thread submits a set of file descriptors
239 SELECT_THREAD_WAIT ();
243 /* Waiting for a set of file descriptors to be submitted by the main thread
245 * => POLLING_DESCRIPTORS: select thread picks up the file descriptors to begin polling
248 g_free (current_pollfds);
250 current_pollfds = next_pollfds;
251 current_n_pollfds = next_n_pollfds;
256 select_thread_set_state (POLLING_DESCRIPTORS);
259 case POLLING_RESTART:
260 /* Select thread is currently polling a set of file descriptors, main thread has
261 * began a new iteration with the same set of file descriptors. We don't want to
262 * wake the select thread up and wait for it to restart immediately, but to avoid
263 * a race (described below in select_thread_start_polling()) we need to recheck after
266 * => POLLING_DESCRIPTORS: select completes, main thread rechecks by polling again
267 * => POLLING_QUEUED: main thread submits a new set of file descriptors to be polled
269 select_thread_set_state (POLLING_DESCRIPTORS);
272 case POLLING_DESCRIPTORS:
273 /* In the process of polling the file descriptors
275 * => WAITING: polling completes when a file descriptor becomes active
276 * => POLLING_QUEUED: main thread submits a new set of file descriptors to be polled
277 * => POLLING_RESTART: main thread begins a new iteration with the same set file descriptors
279 SELECT_THREAD_UNLOCK ();
280 old_poll_func (current_pollfds, current_n_pollfds, -1);
281 SELECT_THREAD_LOCK ();
283 read (select_thread_wakeup_pipe[0], &c, 1);
285 if (select_thread_state == POLLING_DESCRIPTORS)
287 signal_main_thread ();
288 select_thread_set_state (WAITING);
296 got_fd_activity (void *info)
300 /* Post a message so we'll break out of the message loop */
301 event = [NSEvent otherEventWithType: NSApplicationDefined
302 location: NSZeroPoint
307 subtype: GDK_QUARTZ_EVENT_SUBTYPE_EVENTLOOP
311 [NSApp postEvent:event atStart:YES];
315 select_thread_start (void)
317 g_return_if_fail (select_thread_state == BEFORE_START);
319 pipe (select_thread_wakeup_pipe);
320 fcntl (select_thread_wakeup_pipe[0], F_SETFL, O_NONBLOCK);
322 CFRunLoopSourceContext source_context = {0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, got_fd_activity };
323 select_main_thread_source = CFRunLoopSourceCreate (NULL, 0, &source_context);
325 CFRunLoopAddSource (main_thread_run_loop, select_main_thread_source, kCFRunLoopCommonModes);
327 select_thread_state = WAITING;
331 if (pthread_create (&select_thread, NULL, select_thread_func, NULL) == 0)
334 g_warning ("Failed to create select thread, sleeping and trying again");
339 #ifdef G_ENABLE_DEBUG
341 dump_poll_result (GPollFD *ufds,
346 for (i = 0; i < nfds; i++)
348 if (ufds[i].fd >= 0 && ufds[i].revents)
350 g_print (" %d:", ufds[i].fd);
351 if (ufds[i].revents & G_IO_IN)
353 if (ufds[i].revents & G_IO_OUT)
355 if (ufds[i].revents & G_IO_PRI)
364 pollfds_equal (GPollFD *old_pollfds,
366 GPollFD *new_pollfds,
371 if (old_n_pollfds != new_n_pollfds)
374 for (i = 0; i < old_n_pollfds; i++)
376 if (old_pollfds[i].fd != new_pollfds[i].fd ||
377 old_pollfds[i].events != new_pollfds[i].events)
384 /* Begins a polling operation with the specified GPollFD array; the
385 * timeout is used only to tell if the polling operation is blocking
389 * -1: No file descriptors ready, began asynchronous poll
390 * 0: No file descriptors ready, asynchronous poll not needed
391 * > 0: Number of file descriptors ready
394 select_thread_start_poll (GPollFD *ufds,
395 guint nfds, gint timeout)
398 gboolean have_new_pollfds = FALSE;
399 gint poll_fd_index = -1;
402 for (i = 0; i < nfds; i++)
403 if (ufds[i].fd == -1)
410 (nfds == 1 && poll_fd_index >= 0))
412 GDK_NOTE (EVENTLOOP, g_print ("EventLoop: Nothing to poll\n"));
416 /* If we went immediately to an async poll, then we might decide to
417 * dispatch idle functions when higher priority file descriptor sources
418 * are ready to be dispatched. So we always need to first check
419 * check synchronously with a timeout of zero, and only when no
420 * sources are immediately ready, go to the asynchronous poll.
422 * Of course, if the timeout passed in is 0, then the synchronous
423 * check is sufficient and we never need to do the asynchronous poll.
425 n_ready = old_poll_func (ufds, nfds, 0);
426 if (n_ready > 0 || timeout == 0)
428 #ifdef G_ENABLE_DEBUG
429 if ((_gdk_debug_flags & GDK_DEBUG_EVENTLOOP) && n_ready > 0)
431 g_print ("EventLoop: Found ready file descriptors before waiting\n");
432 dump_poll_result (ufds, nfds);
439 SELECT_THREAD_LOCK ();
441 if (select_thread_state == BEFORE_START)
443 select_thread_start ();
446 if (select_thread_state == POLLING_QUEUED)
448 /* If the select thread hasn't picked up the set of file descriptors yet
449 * then we can simply replace an old stale set with a new set.
451 if (!pollfds_equal (ufds, nfds, next_pollfds, next_n_pollfds - 1))
453 g_free (next_pollfds);
457 have_new_pollfds = TRUE;
460 else if (select_thread_state == POLLING_RESTART || select_thread_state == POLLING_DESCRIPTORS)
462 /* If we are already in the process of polling the right set of file descriptors,
463 * there's no need for us to immediately force the select thread to stop polling
464 * and then restart again. And avoiding doing so increases the efficiency considerably
465 * in the common case where we have a set of basically inactive file descriptors that
466 * stay unchanged present as we process many events.
468 * However, we have to be careful that we don't hit the following race condition
469 * Select Thread Main Thread
470 * ----------------- ---------------
472 * Reads data or otherwise changes file descriptor state
473 * Checks if polling is current
477 * Marks polling as complete
479 * Receives old stale file descriptor state
481 * To avoid this, when the new set of poll descriptors is the same as the current
482 * one, we transition to the POLLING_RESTART stage at the point marked (*). When
483 * the select thread wakes up from the poll because a file descriptor is active, if
484 * the state is POLLING_RESTART it immediately begins polling same the file descriptor
485 * set again. This normally will just return the same set of active file descriptors
486 * as the first time, but in sequence described above will properly update the
487 * file descriptor state.
489 * Special case: this RESTART logic is not needed if the only FD is the internal GLib
490 * "wakeup pipe" that is presented when threads are initialized.
492 * P.S.: The harm in the above sequence is mostly that sources can be signalled
493 * as ready when they are no longer ready. This may prompt a blocking read
494 * from a file descriptor that hangs.
496 if (!pollfds_equal (ufds, nfds, current_pollfds, current_n_pollfds - 1))
497 have_new_pollfds = TRUE;
500 if (!((nfds == 1 && poll_fd_index < 0 && g_thread_supported ()) ||
501 (nfds == 2 && poll_fd_index >= 0 && g_thread_supported ())))
502 select_thread_set_state (POLLING_RESTART);
506 have_new_pollfds = TRUE;
508 if (have_new_pollfds)
510 GDK_NOTE (EVENTLOOP, g_print ("EventLoop: Submitting a new set of file descriptor to the select thread\n"));
512 g_assert (next_pollfds == NULL);
514 next_n_pollfds = nfds + 1;
515 next_pollfds = g_new (GPollFD, nfds + 1);
516 memcpy (next_pollfds, ufds, nfds * sizeof (GPollFD));
518 next_pollfds[nfds].fd = select_thread_wakeup_pipe[0];
519 next_pollfds[nfds].events = G_IO_IN;
521 if (select_thread_state != POLLING_QUEUED && select_thread_state != WAITING)
523 if (select_thread_wakeup_pipe[1])
526 write (select_thread_wakeup_pipe[1], &c, 1);
530 select_thread_set_state (POLLING_QUEUED);
533 SELECT_THREAD_UNLOCK ();
538 /* End an asynchronous polling operation started with
539 * select_thread_collect_poll(). This must be called if and only if
540 * select_thread_start_poll() return -1. The GPollFD array passed
541 * in must be identical to the one passed to select_thread_start_poll().
543 * The results of the poll are written into the GPollFD array passed in.
545 * Return Value: number of file descriptors ready
548 select_thread_collect_poll (GPollFD *ufds, guint nfds)
553 SELECT_THREAD_LOCK ();
555 if (select_thread_state == WAITING) /* The poll completed */
557 for (i = 0; i < nfds; i++)
559 if (ufds[i].fd == -1)
562 g_assert (ufds[i].fd == current_pollfds[i].fd);
563 g_assert (ufds[i].events == current_pollfds[i].events);
565 if (current_pollfds[i].revents)
567 ufds[i].revents = current_pollfds[i].revents;
572 #ifdef G_ENABLE_DEBUG
573 if (_gdk_debug_flags & GDK_DEBUG_EVENTLOOP)
575 g_print ("EventLoop: Found ready file descriptors after waiting\n");
576 dump_poll_result (ufds, nfds);
581 SELECT_THREAD_UNLOCK ();
586 /************************************************************
587 ********* Main Loop Source *********
588 ************************************************************/
591 _gdk_quartz_event_loop_check_pending (void)
593 return current_events && current_events->head;
597 _gdk_quartz_event_loop_get_pending (void)
599 NSEvent *event = NULL;
602 event = g_queue_pop_tail (current_events);
608 _gdk_quartz_event_loop_release_event (NSEvent *event)
614 gdk_event_prepare (GSource *source,
619 GDK_THREADS_ENTER ();
623 retval = (_gdk_event_queue_find_first (_gdk_display) != NULL ||
624 _gdk_quartz_event_loop_check_pending ());
626 GDK_THREADS_LEAVE ();
632 gdk_event_check (GSource *source)
636 GDK_THREADS_ENTER ();
638 /* Refresh the autorelease pool if we're at the base CFRunLoop level
639 * (indicated by current_loop_level) and the base g_main_loop level
640 * (indicated by g_main_depth()). Messing with the autorelease pool at
641 * any level of nesting can cause access to deallocated memory because
642 * autorelease_pool is static and releasing a pool will cause all pools
643 * allocated inside of it to be released as well.
645 if (current_loop_level == 0 && g_main_depth() == 0)
647 if (autorelease_pool)
648 [autorelease_pool drain];
650 autorelease_pool = [[NSAutoreleasePool alloc] init];
653 retval = (_gdk_event_queue_find_first (_gdk_display) != NULL ||
654 _gdk_quartz_event_loop_check_pending ());
656 GDK_THREADS_LEAVE ();
662 gdk_event_dispatch (GSource *source,
663 GSourceFunc callback,
668 GDK_THREADS_ENTER ();
670 _gdk_quartz_display_queue_events (_gdk_display);
672 event = _gdk_event_unqueue (_gdk_display);
676 _gdk_event_emit (event);
678 gdk_event_free (event);
681 GDK_THREADS_LEAVE ();
686 static GSourceFuncs event_funcs = {
693 /************************************************************
694 ********* Our Poll Function *********
695 ************************************************************/
698 poll_func (GPollFD *ufds,
706 n_ready = select_thread_start_poll (ufds, nfds, timeout_);
711 limit_date = [NSDate distantFuture];
712 else if (timeout_ == 0)
713 limit_date = [NSDate distantPast];
715 limit_date = [NSDate dateWithTimeIntervalSinceNow:timeout_/1000.0];
718 event = [NSApp nextEventMatchingMask: NSAnyEventMask
719 untilDate: limit_date
720 inMode: NSDefaultRunLoopMode
725 n_ready = select_thread_collect_poll (ufds, nfds);
728 [event type] == NSApplicationDefined &&
729 [event subtype] == GDK_QUARTZ_EVENT_SUBTYPE_EVENTLOOP)
731 /* Just used to wake us up; if an event and a FD arrived at the same
732 * time; could have come from a previous iteration in some cases,
733 * but the spurious wake up is harmless if a little inefficient.
741 current_events = g_queue_new ();
742 g_queue_push_head (current_events, [event retain]);
748 /************************************************************
749 ********* Running the main loop out of CFRunLoop *********
750 ************************************************************/
752 /* Wrapper around g_main_context_query() that handles reallocating
753 * run_loop_pollfds up to the proper size
756 query_main_context (GMainContext *context,
762 if (!run_loop_pollfds)
764 run_loop_pollfds_size = RUN_LOOP_POLLFDS_INITIAL_SIZE;
765 run_loop_pollfds = g_new (GPollFD, run_loop_pollfds_size);
768 while ((nfds = g_main_context_query (context, max_priority, timeout,
770 run_loop_pollfds_size)) > run_loop_pollfds_size)
772 g_free (run_loop_pollfds);
773 run_loop_pollfds_size = nfds;
774 run_loop_pollfds = g_new (GPollFD, nfds);
781 run_loop_entry (void)
783 if (acquired_loop_level == -1)
785 if (g_main_context_acquire (NULL))
787 GDK_NOTE (EVENTLOOP, g_print ("EventLoop: Beginning tracking run loop activity\n"));
788 acquired_loop_level = current_loop_level;
792 /* If we fail to acquire the main context, that means someone is iterating
793 * the main context in a different thread; we simply wait until this loop
794 * exits and then try again at next entry. In general, iterating the loop
795 * from a different thread is rare: it is only possible when GDK threading
796 * is initialized and is not frequently used even then. So, we hope that
797 * having GLib main loop iteration blocked in the combination of that and
798 * a native modal operation is a minimal problem. We could imagine using a
799 * thread that does g_main_context_wait() and then wakes us back up, but
800 * the gain doesn't seem worth the complexity.
802 GDK_NOTE (EVENTLOOP, g_print ("EventLoop: Can't acquire main loop; skipping tracking run loop activity\n"));
808 run_loop_before_timers (void)
813 run_loop_before_sources (void)
815 GMainContext *context = g_main_context_default ();
819 /* Before we let the CFRunLoop process sources, we want to check if there
820 * are any pending GLib main loop sources more urgent than
821 * G_PRIORITY_DEFAULT that need to be dispatched. (We consider all activity
822 * from the CFRunLoop to have a priority of G_PRIORITY_DEFAULT.) If no
823 * sources are processed by the CFRunLoop, then processing will continue
824 * on to the BeforeWaiting stage where we check for lower priority sources.
827 g_main_context_prepare (context, &max_priority);
828 max_priority = MIN (max_priority, G_PRIORITY_DEFAULT);
830 /* We ignore the timeout that query_main_context () returns since we'll
831 * always query again before waiting.
833 nfds = query_main_context (context, max_priority, NULL);
836 old_poll_func (run_loop_pollfds, nfds, 0);
838 if (g_main_context_check (context, max_priority, run_loop_pollfds, nfds))
840 GDK_NOTE (EVENTLOOP, g_print ("EventLoop: Dispatching high priority sources\n"));
841 g_main_context_dispatch (context);
846 dummy_timer_callback (CFRunLoopTimerRef timer,
849 /* Nothing; won't normally even be called */
853 run_loop_before_waiting (void)
855 GMainContext *context = g_main_context_default ();
859 /* At this point, the CFRunLoop is ready to wait. We start a GMain loop
860 * iteration by calling the check() and query() stages. We start a
861 * poll, and if it doesn't complete immediately we let the run loop
862 * go ahead and sleep. Before doing that, if there was a timeout from
863 * GLib, we set up a CFRunLoopTimer to wake us up.
866 g_main_context_prepare (context, &run_loop_max_priority);
868 run_loop_n_pollfds = query_main_context (context, run_loop_max_priority, &timeout);
870 n_ready = select_thread_start_poll (run_loop_pollfds, run_loop_n_pollfds, timeout);
872 if (n_ready > 0 || timeout == 0)
874 /* We have stuff to do, no sleeping allowed! */
875 CFRunLoopWakeUp (main_thread_run_loop);
877 else if (timeout > 0)
879 /* We need to get the run loop to break out of its wait when our timeout
880 * expires. We do this by adding a dummy timer that we'll remove immediately
881 * after the wait wakes up.
883 GDK_NOTE (EVENTLOOP, g_print ("EventLoop: Adding timer to wake us up in %d milliseconds\n", timeout));
885 run_loop_timer = CFRunLoopTimerCreate (NULL, /* allocator */
886 CFAbsoluteTimeGetCurrent () + timeout / 1000.,
887 0, /* interval (0=does not repeat) */
889 0, /* order (priority) */
890 dummy_timer_callback,
893 CFRunLoopAddTimer (main_thread_run_loop, run_loop_timer, kCFRunLoopCommonModes);
896 run_loop_polling_async = n_ready < 0;
900 run_loop_after_waiting (void)
902 GMainContext *context = g_main_context_default ();
904 /* After sleeping, we finish of the GMain loop iteratin started in before_waiting()
905 * by doing the check() and dispatch() stages.
910 CFRunLoopRemoveTimer (main_thread_run_loop, run_loop_timer, kCFRunLoopCommonModes);
911 CFRelease (run_loop_timer);
912 run_loop_timer = NULL;
915 if (run_loop_polling_async)
917 select_thread_collect_poll (run_loop_pollfds, run_loop_n_pollfds);
918 run_loop_polling_async = FALSE;
921 if (g_main_context_check (context, run_loop_max_priority, run_loop_pollfds, run_loop_n_pollfds))
923 GDK_NOTE (EVENTLOOP, g_print ("EventLoop: Dispatching after waiting\n"));
924 g_main_context_dispatch (context);
931 /* + 1 because we decrement current_loop_level separately in observer_callback() */
932 if ((current_loop_level + 1) == acquired_loop_level)
934 g_main_context_release (NULL);
935 acquired_loop_level = -1;
936 GDK_NOTE (EVENTLOOP, g_print ("EventLoop: Ended tracking run loop activity\n"));
941 run_loop_observer_callback (CFRunLoopObserverRef observer,
942 CFRunLoopActivity activity,
947 case kCFRunLoopEntry:
948 current_loop_level++;
951 g_return_if_fail (current_loop_level > 0);
952 current_loop_level--;
958 if (getting_events > 0) /* Activity we triggered */
963 case kCFRunLoopEntry:
966 case kCFRunLoopBeforeTimers:
967 run_loop_before_timers ();
969 case kCFRunLoopBeforeSources:
970 run_loop_before_sources ();
972 case kCFRunLoopBeforeWaiting:
973 run_loop_before_waiting ();
975 case kCFRunLoopAfterWaiting:
976 run_loop_after_waiting ();
986 /************************************************************/
989 _gdk_quartz_event_loop_init (void)
992 CFRunLoopObserverRef observer;
994 /* Hook into the GLib main loop */
996 event_poll_fd.events = G_IO_IN;
997 event_poll_fd.fd = -1;
999 source = g_source_new (&event_funcs, sizeof (GSource));
1000 g_source_set_name (source, "GDK Quartz event source");
1001 g_source_add_poll (source, &event_poll_fd);
1002 g_source_set_priority (source, GDK_PRIORITY_EVENTS);
1003 g_source_set_can_recurse (source, TRUE);
1004 g_source_attach (source, NULL);
1006 old_poll_func = g_main_context_get_poll_func (NULL);
1007 g_main_context_set_poll_func (NULL, poll_func);
1009 /* Hook into the the CFRunLoop for the main thread */
1011 main_thread_run_loop = CFRunLoopGetCurrent ();
1013 observer = CFRunLoopObserverCreate (NULL, /* default allocator */
1014 kCFRunLoopAllActivities,
1015 true, /* repeats: not one-shot */
1016 0, /* order (priority) */
1017 run_loop_observer_callback,
1020 CFRunLoopAddObserver (main_thread_run_loop, observer, kCFRunLoopCommonModes);
1022 /* Initialize our autorelease pool */
1024 autorelease_pool = [[NSAutoreleasePool alloc] init];