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 if (CFRunLoopIsWaiting (main_thread_run_loop))
212 CFRunLoopWakeUp (main_thread_run_loop);
216 select_thread_func (void *arg)
220 SELECT_THREAD_LOCK ();
224 switch (select_thread_state)
227 /* The select thread has not been started yet
229 g_assert_not_reached ();
232 /* Waiting for a set of file descriptors to be submitted by the main thread
234 * => POLLING_QUEUED: main thread thread submits a set of file descriptors
236 SELECT_THREAD_WAIT ();
240 /* Waiting for a set of file descriptors to be submitted by the main thread
242 * => POLLING_DESCRIPTORS: select thread picks up the file descriptors to begin polling
245 g_free (current_pollfds);
247 current_pollfds = next_pollfds;
248 current_n_pollfds = next_n_pollfds;
253 select_thread_set_state (POLLING_DESCRIPTORS);
256 case POLLING_RESTART:
257 /* Select thread is currently polling a set of file descriptors, main thread has
258 * began a new iteration with the same set of file descriptors. We don't want to
259 * wake the select thread up and wait for it to restart immediately, but to avoid
260 * a race (described below in select_thread_start_polling()) we need to recheck after
263 * => POLLING_DESCRIPTORS: select completes, main thread rechecks by polling again
264 * => POLLING_QUEUED: main thread submits a new set of file descriptors to be polled
266 select_thread_set_state (POLLING_DESCRIPTORS);
269 case POLLING_DESCRIPTORS:
270 /* In the process of polling the file descriptors
272 * => WAITING: polling completes when a file descriptor becomes active
273 * => POLLING_QUEUED: main thread submits a new set of file descriptors to be polled
274 * => POLLING_RESTART: main thread begins a new iteration with the same set file descriptors
276 SELECT_THREAD_UNLOCK ();
277 old_poll_func (current_pollfds, current_n_pollfds, -1);
278 SELECT_THREAD_LOCK ();
280 read (select_thread_wakeup_pipe[0], &c, 1);
282 if (select_thread_state == POLLING_DESCRIPTORS)
284 signal_main_thread ();
285 select_thread_set_state (WAITING);
293 got_fd_activity (void *info)
297 /* Post a message so we'll break out of the message loop */
298 event = [NSEvent otherEventWithType: NSApplicationDefined
299 location: NSZeroPoint
304 subtype: GDK_QUARTZ_EVENT_SUBTYPE_EVENTLOOP
308 [NSApp postEvent:event atStart:YES];
312 select_thread_start (void)
314 g_return_if_fail (select_thread_state == BEFORE_START);
316 pipe (select_thread_wakeup_pipe);
317 fcntl (select_thread_wakeup_pipe[0], F_SETFL, O_NONBLOCK);
319 CFRunLoopSourceContext source_context = {0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, got_fd_activity };
320 select_main_thread_source = CFRunLoopSourceCreate (NULL, 0, &source_context);
322 CFRunLoopAddSource (main_thread_run_loop, select_main_thread_source, kCFRunLoopCommonModes);
324 select_thread_state = WAITING;
328 if (pthread_create (&select_thread, NULL, select_thread_func, NULL) == 0)
331 g_warning ("Failed to create select thread, sleeping and trying again");
336 #ifdef G_ENABLE_DEBUG
338 dump_poll_result (GPollFD *ufds,
343 for (i = 0; i < nfds; i++)
345 if (ufds[i].fd >= 0 && ufds[i].revents)
347 g_print (" %d:", ufds[i].fd);
348 if (ufds[i].revents & G_IO_IN)
350 if (ufds[i].revents & G_IO_OUT)
352 if (ufds[i].revents & G_IO_PRI)
361 pollfds_equal (GPollFD *old_pollfds,
363 GPollFD *new_pollfds,
368 if (old_n_pollfds != new_n_pollfds)
371 for (i = 0; i < old_n_pollfds; i++)
373 if (old_pollfds[i].fd != new_pollfds[i].fd ||
374 old_pollfds[i].events != new_pollfds[i].events)
381 /* Begins a polling operation with the specified GPollFD array; the
382 * timeout is used only to tell if the polling operation is blocking
386 * -1: No file descriptors ready, began asynchronous poll
387 * 0: No file descriptors ready, asynchronous poll not needed
388 * > 0: Number of file descriptors ready
391 select_thread_start_poll (GPollFD *ufds,
392 guint nfds, gint timeout)
395 gboolean have_new_pollfds = FALSE;
396 gint poll_fd_index = -1;
399 for (i = 0; i < nfds; i++)
400 if (ufds[i].fd == -1)
407 (nfds == 1 && poll_fd_index >= 0))
409 GDK_NOTE (EVENTLOOP, g_print ("EventLoop: Nothing to poll\n"));
413 /* If we went immediately to an async poll, then we might decide to
414 * dispatch idle functions when higher priority file descriptor sources
415 * are ready to be dispatched. So we always need to first check
416 * check synchronously with a timeout of zero, and only when no
417 * sources are immediately ready, go to the asynchronous poll.
419 * Of course, if the timeout passed in is 0, then the synchronous
420 * check is sufficient and we never need to do the asynchronous poll.
422 n_ready = old_poll_func (ufds, nfds, 0);
423 if (n_ready > 0 || timeout == 0)
425 #ifdef G_ENABLE_DEBUG
426 if ((_gdk_debug_flags & GDK_DEBUG_EVENTLOOP) && n_ready > 0)
428 g_print ("EventLoop: Found ready file descriptors before waiting\n");
429 dump_poll_result (ufds, nfds);
436 SELECT_THREAD_LOCK ();
438 if (select_thread_state == BEFORE_START)
440 select_thread_start ();
443 if (select_thread_state == POLLING_QUEUED)
445 /* If the select thread hasn't picked up the set of file descriptors yet
446 * then we can simply replace an old stale set with a new set.
448 if (!pollfds_equal (ufds, nfds, next_pollfds, next_n_pollfds - 1))
450 g_free (next_pollfds);
454 have_new_pollfds = TRUE;
457 else if (select_thread_state == POLLING_RESTART || select_thread_state == POLLING_DESCRIPTORS)
459 /* If we are already in the process of polling the right set of file descriptors,
460 * there's no need for us to immediately force the select thread to stop polling
461 * and then restart again. And avoiding doing so increases the efficiency considerably
462 * in the common case where we have a set of basically inactive file descriptors that
463 * stay unchanged present as we process many events.
465 * However, we have to be careful that we don't hit the following race condition
466 * Select Thread Main Thread
467 * ----------------- ---------------
469 * Reads data or otherwise changes file descriptor state
470 * Checks if polling is current
474 * Marks polling as complete
476 * Receives old stale file descriptor state
478 * To avoid this, when the new set of poll descriptors is the same as the current
479 * one, we transition to the POLLING_RESTART stage at the point marked (*). When
480 * the select thread wakes up from the poll because a file descriptor is active, if
481 * the state is POLLING_RESTART it immediately begins polling same the file descriptor
482 * set again. This normally will just return the same set of active file descriptors
483 * as the first time, but in sequence described above will properly update the
484 * file descriptor state.
486 * Special case: this RESTART logic is not needed if the only FD is the internal GLib
487 * "wakeup pipe" that is presented when threads are initialized.
489 * P.S.: The harm in the above sequence is mostly that sources can be signalled
490 * as ready when they are no longer ready. This may prompt a blocking read
491 * from a file descriptor that hangs.
493 if (!pollfds_equal (ufds, nfds, current_pollfds, current_n_pollfds - 1))
494 have_new_pollfds = TRUE;
497 if (!((nfds == 1 && poll_fd_index < 0 && g_thread_supported ()) ||
498 (nfds == 2 && poll_fd_index >= 0 && g_thread_supported ())))
499 select_thread_set_state (POLLING_RESTART);
503 have_new_pollfds = TRUE;
505 if (have_new_pollfds)
507 GDK_NOTE (EVENTLOOP, g_print ("EventLoop: Submitting a new set of file descriptor to the select thread\n"));
509 g_assert (next_pollfds == NULL);
511 next_n_pollfds = nfds + 1;
512 next_pollfds = g_new (GPollFD, nfds + 1);
513 memcpy (next_pollfds, ufds, nfds * sizeof (GPollFD));
515 next_pollfds[nfds].fd = select_thread_wakeup_pipe[0];
516 next_pollfds[nfds].events = G_IO_IN;
518 if (select_thread_state != POLLING_QUEUED && select_thread_state != WAITING)
520 if (select_thread_wakeup_pipe[1])
523 write (select_thread_wakeup_pipe[1], &c, 1);
527 select_thread_set_state (POLLING_QUEUED);
530 SELECT_THREAD_UNLOCK ();
535 /* End an asynchronous polling operation started with
536 * select_thread_collect_poll(). This must be called if and only if
537 * select_thread_start_poll() return -1. The GPollFD array passed
538 * in must be identical to the one passed to select_thread_start_poll().
540 * The results of the poll are written into the GPollFD array passed in.
542 * Return Value: number of file descriptors ready
545 select_thread_collect_poll (GPollFD *ufds, guint nfds)
550 SELECT_THREAD_LOCK ();
552 if (select_thread_state == WAITING) /* The poll completed */
554 for (i = 0; i < nfds; i++)
556 if (ufds[i].fd == -1)
559 g_assert (ufds[i].fd == current_pollfds[i].fd);
560 g_assert (ufds[i].events == current_pollfds[i].events);
562 if (current_pollfds[i].revents)
564 ufds[i].revents = current_pollfds[i].revents;
569 #ifdef G_ENABLE_DEBUG
570 if (_gdk_debug_flags & GDK_DEBUG_EVENTLOOP)
572 g_print ("EventLoop: Found ready file descriptors after waiting\n");
573 dump_poll_result (ufds, nfds);
578 SELECT_THREAD_UNLOCK ();
583 /************************************************************
584 ********* Main Loop Source *********
585 ************************************************************/
588 _gdk_quartz_event_loop_check_pending (void)
590 return current_events && current_events->head;
594 _gdk_quartz_event_loop_get_pending (void)
596 NSEvent *event = NULL;
599 event = g_queue_pop_tail (current_events);
605 _gdk_quartz_event_loop_release_event (NSEvent *event)
611 gdk_event_prepare (GSource *source,
616 GDK_THREADS_ENTER ();
620 retval = (_gdk_event_queue_find_first (_gdk_display) != NULL ||
621 _gdk_quartz_event_loop_check_pending ());
623 GDK_THREADS_LEAVE ();
629 gdk_event_check (GSource *source)
633 GDK_THREADS_ENTER ();
635 /* Refresh the autorelease pool if we're at the base CFRunLoop level
636 * (indicated by current_loop_level) and the base g_main_loop level
637 * (indicated by g_main_depth()). Messing with the autorelease pool at
638 * any level of nesting can cause access to deallocated memory because
639 * autorelease_pool is static and releasing a pool will cause all pools
640 * allocated inside of it to be released as well.
642 if (current_loop_level == 0 && g_main_depth() == 0)
644 if (autorelease_pool)
645 [autorelease_pool drain];
647 autorelease_pool = [[NSAutoreleasePool alloc] init];
650 retval = (_gdk_event_queue_find_first (_gdk_display) != NULL ||
651 _gdk_quartz_event_loop_check_pending ());
653 GDK_THREADS_LEAVE ();
659 gdk_event_dispatch (GSource *source,
660 GSourceFunc callback,
665 GDK_THREADS_ENTER ();
667 _gdk_quartz_display_queue_events (_gdk_display);
669 event = _gdk_event_unqueue (_gdk_display);
673 _gdk_event_emit (event);
675 gdk_event_free (event);
678 GDK_THREADS_LEAVE ();
683 static GSourceFuncs event_funcs = {
690 /************************************************************
691 ********* Our Poll Function *********
692 ************************************************************/
695 poll_func (GPollFD *ufds,
703 n_ready = select_thread_start_poll (ufds, nfds, timeout_);
708 limit_date = [NSDate distantFuture];
709 else if (timeout_ == 0)
710 limit_date = [NSDate distantPast];
712 limit_date = [NSDate dateWithTimeIntervalSinceNow:timeout_/1000.0];
715 event = [NSApp nextEventMatchingMask: NSAnyEventMask
716 untilDate: limit_date
717 inMode: NSDefaultRunLoopMode
722 n_ready = select_thread_collect_poll (ufds, nfds);
725 [event type] == NSApplicationDefined &&
726 [event subtype] == GDK_QUARTZ_EVENT_SUBTYPE_EVENTLOOP)
728 /* Just used to wake us up; if an event and a FD arrived at the same
729 * time; could have come from a previous iteration in some cases,
730 * but the spurious wake up is harmless if a little inefficient.
738 current_events = g_queue_new ();
739 g_queue_push_head (current_events, [event retain]);
745 /************************************************************
746 ********* Running the main loop out of CFRunLoop *********
747 ************************************************************/
749 /* Wrapper around g_main_context_query() that handles reallocating
750 * run_loop_pollfds up to the proper size
753 query_main_context (GMainContext *context,
759 if (!run_loop_pollfds)
761 run_loop_pollfds_size = RUN_LOOP_POLLFDS_INITIAL_SIZE;
762 run_loop_pollfds = g_new (GPollFD, run_loop_pollfds_size);
765 while ((nfds = g_main_context_query (context, max_priority, timeout,
767 run_loop_pollfds_size)) > run_loop_pollfds_size)
769 g_free (run_loop_pollfds);
770 run_loop_pollfds_size = nfds;
771 run_loop_pollfds = g_new (GPollFD, nfds);
778 run_loop_entry (void)
780 if (acquired_loop_level == -1)
782 if (g_main_context_acquire (NULL))
784 GDK_NOTE (EVENTLOOP, g_print ("EventLoop: Beginning tracking run loop activity\n"));
785 acquired_loop_level = current_loop_level;
789 /* If we fail to acquire the main context, that means someone is iterating
790 * the main context in a different thread; we simply wait until this loop
791 * exits and then try again at next entry. In general, iterating the loop
792 * from a different thread is rare: it is only possible when GDK threading
793 * is initialized and is not frequently used even then. So, we hope that
794 * having GLib main loop iteration blocked in the combination of that and
795 * a native modal operation is a minimal problem. We could imagine using a
796 * thread that does g_main_context_wait() and then wakes us back up, but
797 * the gain doesn't seem worth the complexity.
799 GDK_NOTE (EVENTLOOP, g_print ("EventLoop: Can't acquire main loop; skipping tracking run loop activity\n"));
805 run_loop_before_timers (void)
810 run_loop_before_sources (void)
812 GMainContext *context = g_main_context_default ();
816 /* Before we let the CFRunLoop process sources, we want to check if there
817 * are any pending GLib main loop sources more urgent than
818 * G_PRIORITY_DEFAULT that need to be dispatched. (We consider all activity
819 * from the CFRunLoop to have a priority of G_PRIORITY_DEFAULT.) If no
820 * sources are processed by the CFRunLoop, then processing will continue
821 * on to the BeforeWaiting stage where we check for lower priority sources.
824 g_main_context_prepare (context, &max_priority);
825 max_priority = MIN (max_priority, G_PRIORITY_DEFAULT);
827 /* We ignore the timeout that query_main_context () returns since we'll
828 * always query again before waiting.
830 nfds = query_main_context (context, max_priority, NULL);
833 old_poll_func (run_loop_pollfds, nfds, 0);
835 if (g_main_context_check (context, max_priority, run_loop_pollfds, nfds))
837 GDK_NOTE (EVENTLOOP, g_print ("EventLoop: Dispatching high priority sources\n"));
838 g_main_context_dispatch (context);
843 dummy_timer_callback (CFRunLoopTimerRef timer,
846 /* Nothing; won't normally even be called */
850 run_loop_before_waiting (void)
852 GMainContext *context = g_main_context_default ();
856 /* At this point, the CFRunLoop is ready to wait. We start a GMain loop
857 * iteration by calling the check() and query() stages. We start a
858 * poll, and if it doesn't complete immediately we let the run loop
859 * go ahead and sleep. Before doing that, if there was a timeout from
860 * GLib, we set up a CFRunLoopTimer to wake us up.
863 g_main_context_prepare (context, &run_loop_max_priority);
865 run_loop_n_pollfds = query_main_context (context, run_loop_max_priority, &timeout);
867 n_ready = select_thread_start_poll (run_loop_pollfds, run_loop_n_pollfds, timeout);
869 if (n_ready > 0 || timeout == 0)
871 /* We have stuff to do, no sleeping allowed! */
872 CFRunLoopWakeUp (main_thread_run_loop);
874 else if (timeout > 0)
876 /* We need to get the run loop to break out of its wait when our timeout
877 * expires. We do this by adding a dummy timer that we'll remove immediately
878 * after the wait wakes up.
880 GDK_NOTE (EVENTLOOP, g_print ("EventLoop: Adding timer to wake us up in %d milliseconds\n", timeout));
882 run_loop_timer = CFRunLoopTimerCreate (NULL, /* allocator */
883 CFAbsoluteTimeGetCurrent () + timeout / 1000.,
884 0, /* interval (0=does not repeat) */
886 0, /* order (priority) */
887 dummy_timer_callback,
890 CFRunLoopAddTimer (main_thread_run_loop, run_loop_timer, kCFRunLoopCommonModes);
893 run_loop_polling_async = n_ready < 0;
897 run_loop_after_waiting (void)
899 GMainContext *context = g_main_context_default ();
901 /* After sleeping, we finish of the GMain loop iteratin started in before_waiting()
902 * by doing the check() and dispatch() stages.
907 CFRunLoopRemoveTimer (main_thread_run_loop, run_loop_timer, kCFRunLoopCommonModes);
908 CFRelease (run_loop_timer);
909 run_loop_timer = NULL;
912 if (run_loop_polling_async)
914 select_thread_collect_poll (run_loop_pollfds, run_loop_n_pollfds);
915 run_loop_polling_async = FALSE;
918 if (g_main_context_check (context, run_loop_max_priority, run_loop_pollfds, run_loop_n_pollfds))
920 GDK_NOTE (EVENTLOOP, g_print ("EventLoop: Dispatching after waiting\n"));
921 g_main_context_dispatch (context);
928 /* + 1 because we decrement current_loop_level separately in observer_callback() */
929 if ((current_loop_level + 1) == acquired_loop_level)
931 g_main_context_release (NULL);
932 acquired_loop_level = -1;
933 GDK_NOTE (EVENTLOOP, g_print ("EventLoop: Ended tracking run loop activity\n"));
938 run_loop_observer_callback (CFRunLoopObserverRef observer,
939 CFRunLoopActivity activity,
944 case kCFRunLoopEntry:
945 current_loop_level++;
948 g_return_if_fail (current_loop_level > 0);
949 current_loop_level--;
955 if (getting_events > 0) /* Activity we triggered */
960 case kCFRunLoopEntry:
963 case kCFRunLoopBeforeTimers:
964 run_loop_before_timers ();
966 case kCFRunLoopBeforeSources:
967 run_loop_before_sources ();
969 case kCFRunLoopBeforeWaiting:
970 run_loop_before_waiting ();
972 case kCFRunLoopAfterWaiting:
973 run_loop_after_waiting ();
983 /************************************************************/
986 _gdk_quartz_event_loop_init (void)
989 CFRunLoopObserverRef observer;
991 /* Hook into the GLib main loop */
993 event_poll_fd.events = G_IO_IN;
994 event_poll_fd.fd = -1;
996 source = g_source_new (&event_funcs, sizeof (GSource));
997 g_source_set_name (source, "GDK Quartz event source");
998 g_source_add_poll (source, &event_poll_fd);
999 g_source_set_priority (source, GDK_PRIORITY_EVENTS);
1000 g_source_set_can_recurse (source, TRUE);
1001 g_source_attach (source, NULL);
1003 old_poll_func = g_main_context_get_poll_func (NULL);
1004 g_main_context_set_poll_func (NULL, poll_func);
1006 /* Hook into the the CFRunLoop for the main thread */
1008 main_thread_run_loop = CFRunLoopGetCurrent ();
1010 observer = CFRunLoopObserverCreate (NULL, /* default allocator */
1011 kCFRunLoopAllActivities,
1012 true, /* repeats: not one-shot */
1013 0, /* order (priority) */
1014 run_loop_observer_callback,
1017 CFRunLoopAddObserver (main_thread_run_loop, observer, kCFRunLoopCommonModes);
1019 /* Initialize our autorelease pool */
1021 autorelease_pool = [[NSAutoreleasePool alloc] init];