From 208e292df152d1e9954e8e00faac7e3be66a73c4 Mon Sep 17 00:00:00 2001 From: Carlos Garnacho Date: Wed, 12 Aug 2020 18:04:34 +0200 Subject: [PATCH] backends/native: Add input thread inside MetaSeatImpl This (now) doesn't change anything in regards to the API that the UI thread should access from the MetaSeatImpl. The MetaInputDeviceNative, MetaInputSettings and MetaKeymap objects are now considered owned by the input thread, as well as all of libinput objects. The MetaEventSource now dispatches events in a GMainContext that is the thread default to this thread, and all UI-thread-accessible API (seat and virtual input device API) will be handled in a serialized manner by that same input thread. The MetaSeatImpl itself is still considered to be owned by the caller thread, and all the signals that this object emits will be emitted in the GMainContext that is default at the time of calling meta_seat_impl_new(). The MetaInputSettings configuration changes will likewise be handled in the input thread, close to libinput devices. https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1403 --- src/backends/native/meta-seat-impl.c | 198 +++++++++++++++++++-------- src/backends/native/meta-seat-impl.h | 5 + 2 files changed, 145 insertions(+), 58 deletions(-) diff --git a/src/backends/native/meta-seat-impl.c b/src/backends/native/meta-seat-impl.c index 966097cf2..a4e988ed9 100644 --- a/src/backends/native/meta-seat-impl.c +++ b/src/backends/native/meta-seat-impl.c @@ -118,7 +118,11 @@ enum static guint signals[N_SIGNALS] = { 0 }; -G_DEFINE_TYPE (MetaSeatImpl, meta_seat_impl, G_TYPE_OBJECT) +static void meta_seat_impl_initable_iface_init (GInitableIface *iface); + +G_DEFINE_TYPE_WITH_CODE (MetaSeatImpl, meta_seat_impl, G_TYPE_OBJECT, + G_IMPLEMENT_INTERFACE (G_TYPE_INITABLE, + meta_seat_impl_initable_iface_init)) static void process_events (MetaSeatImpl *seat); void meta_seat_impl_constrain_pointer (MetaSeatImpl *seat, @@ -314,6 +318,50 @@ update_button_count (MetaSeatImpl *seat, } } +typedef struct +{ + MetaSeatImpl *seat; + guint signal_id; + guint arg1; + guint arg2; +} MetaSeatSignalData; + +static gboolean +emit_signal_main (MetaSeatSignalData *data) +{ + g_signal_emit (data->seat, + data->signal_id, + 0, + data->arg1, + data->arg2); + return G_SOURCE_REMOVE; +} + +static void +emit_signal (MetaSeatImpl *seat, + guint signal_id, + guint arg1, + guint arg2) +{ + MetaSeatSignalData *emit_signal_data; + GSource *source; + + emit_signal_data = g_new0 (MetaSeatSignalData, 1); + emit_signal_data->seat = seat; + emit_signal_data->signal_id = signal_id; + emit_signal_data->arg1 = arg1; + emit_signal_data->arg2 = arg2; + + source = g_idle_source_new (); + g_source_set_priority (source, G_PRIORITY_HIGH); + g_source_set_callback (source, + (GSourceFunc) emit_signal_main, + emit_signal_data, + g_free); + + g_source_attach (source, seat->caller_context); +} + void meta_seat_impl_notify_key (MetaSeatImpl *seat, ClutterInputDevice *device, @@ -364,7 +412,7 @@ meta_seat_impl_notify_key (MetaSeatImpl *seat, if (update_keys && (changed_state & XKB_STATE_LEDS)) { - g_signal_emit (seat, signals[MODS_STATE_CHANGED], 0); + emit_signal (seat, signals[MODS_STATE_CHANGED], 0, 0); meta_seat_impl_sync_leds (seat); meta_input_device_native_a11y_maybe_notify_toggle_keys (META_INPUT_DEVICE_NATIVE (seat->core_keyboard)); } @@ -873,26 +921,13 @@ meta_seat_impl_notify_touch_event (MetaSeatImpl *seat, /* * MetaEventSource for reading input devices */ -static gboolean -meta_event_prepare (GSource *source, - gint *timeout) -{ - gboolean retval; - - *timeout = -1; - retval = clutter_events_pending (); - - return retval; -} - static gboolean meta_event_check (GSource *source) { MetaEventSource *event_source = (MetaEventSource *) source; gboolean retval; - retval = ((event_source->event_poll_fd.revents & G_IO_IN) || - clutter_events_pending ()); + retval = !!(event_source->event_poll_fd.revents & G_IO_IN); return retval; } @@ -1372,19 +1407,13 @@ meta_event_dispatch (GSource *g_source, seat = source->seat_impl; - /* Don't queue more events if we haven't finished handling the previous batch - */ - if (clutter_events_pending ()) - goto queue_event; - dispatch_libinput (seat); - queue_event: - return TRUE; } + static GSourceFuncs event_funcs = { - meta_event_prepare, + NULL, meta_event_check, meta_event_dispatch, NULL @@ -1411,7 +1440,7 @@ meta_event_source_new (MetaSeatImpl *seat) g_source_set_priority (source, CLUTTER_PRIORITY_EVENTS); g_source_add_poll (source, &event_source->event_poll_fd); g_source_set_can_recurse (source, TRUE); - g_source_attach (source, NULL); + g_source_attach (source, seat->input_context); return event_source; } @@ -1467,7 +1496,7 @@ update_touch_mode (MetaSeatImpl *seat) if (seat->touch_mode != touch_mode) { seat->touch_mode = touch_mode; - g_signal_emit (seat, signals[TOUCH_MODE], 0, touch_mode); + emit_signal (seat, signals[TOUCH_MODE], touch_mode, 0); } } @@ -2466,36 +2495,21 @@ static const struct libinput_interface libinput_interface = { close_restricted }; -static void -meta_seat_impl_constructed (GObject *object) +static gpointer +input_thread (MetaSeatImpl *seat) { - MetaSeatImpl *seat = META_SEAT_IMPL (object); - ClutterInputDevice *device; MetaEventSource *source; struct udev *udev; struct xkb_keymap *xkb_keymap; - g_rw_lock_writer_lock (&seat->state_lock); - - device = meta_input_device_native_new_virtual ( - seat, CLUTTER_POINTER_DEVICE, - CLUTTER_INPUT_MODE_MASTER); - seat->pointer_x = INITIAL_POINTER_X; - seat->pointer_y = INITIAL_POINTER_Y; - meta_input_device_native_update_coords (META_INPUT_DEVICE_NATIVE (device), - seat->pointer_x, seat->pointer_y); - seat->core_pointer = device; - - device = meta_input_device_native_new_virtual ( - seat, CLUTTER_KEYBOARD_DEVICE, - CLUTTER_INPUT_MODE_MASTER); - seat->core_keyboard = device; + g_main_context_push_thread_default (seat->input_context); udev = udev_new (); if (G_UNLIKELY (udev == NULL)) { g_warning ("Failed to create udev object"); - return; + seat->input_thread_initialized = TRUE; + return NULL; } seat->libinput = libinput_udev_create_context (&libinput_interface, @@ -2503,7 +2517,8 @@ meta_seat_impl_constructed (GObject *object) if (seat->libinput == NULL) { g_critical ("Failed to create the libinput object."); - return; + seat->input_thread_initialized = TRUE; + return NULL; } if (libinput_udev_assign_seat (seat->libinput, seat->seat_id) == -1) @@ -2511,19 +2526,20 @@ meta_seat_impl_constructed (GObject *object) g_critical ("Failed to assign a seat to the libinput object."); libinput_unref (seat->libinput); seat->libinput = NULL; - return; + seat->input_thread_initialized = TRUE; + return NULL; } udev_unref (udev); seat->input_settings = meta_input_settings_native_new (seat); - seat->udev_client = g_udev_client_new ((const gchar *[]) { "input", NULL }); - source = meta_event_source_new (seat); seat->event_source = source; seat->keymap = g_object_new (META_TYPE_KEYMAP_NATIVE, NULL); + + g_rw_lock_writer_lock (&seat->state_lock); xkb_keymap = meta_keymap_native_get_keyboard_map (seat->keymap); if (xkb_keymap) @@ -2543,6 +2559,63 @@ meta_seat_impl_constructed (GObject *object) seat->has_touchscreen = has_touchscreen (seat); update_touch_mode (seat); + seat->input_thread_initialized = TRUE; + + seat->input_loop = g_main_loop_new (seat->input_context, FALSE); + g_main_loop_run (seat->input_loop); + g_main_loop_unref (seat->input_loop); + + g_main_context_pop_thread_default (seat->input_context); + + return NULL; +} + +static gboolean +meta_seat_impl_initable_init (GInitable *initable, + GCancellable *cancellable, + GError **error) +{ + MetaSeatImpl *seat = META_SEAT_IMPL (initable); + + seat->input_context = g_main_context_new (); + seat->caller_context = g_main_context_ref_thread_default (); + + seat->input_thread = + g_thread_try_new ("Mutter Input Thread", + (GThreadFunc) input_thread, + initable, + error); + if (!seat->input_thread) + return FALSE; + + while (!seat->input_thread_initialized) + g_usleep (100); + + return TRUE; +} + +static void +meta_seat_impl_constructed (GObject *object) +{ + MetaSeatImpl *seat = META_SEAT_IMPL (object); + ClutterInputDevice *device; + + device = meta_input_device_native_new_virtual ( + seat, CLUTTER_POINTER_DEVICE, + CLUTTER_INPUT_MODE_MASTER); + seat->pointer_x = INITIAL_POINTER_X; + seat->pointer_y = INITIAL_POINTER_Y; + meta_input_device_native_update_coords (META_INPUT_DEVICE_NATIVE (device), + seat->pointer_x, seat->pointer_y); + seat->core_pointer = device; + + device = meta_input_device_native_new_virtual ( + seat, CLUTTER_KEYBOARD_DEVICE, + CLUTTER_INPUT_MODE_MASTER); + seat->core_keyboard = device; + + seat->udev_client = g_udev_client_new ((const gchar *[]) { "input", NULL }); + if (G_OBJECT_CLASS (meta_seat_impl_parent_class)->constructed) G_OBJECT_CLASS (meta_seat_impl_parent_class)->constructed (object); } @@ -2609,6 +2682,9 @@ meta_seat_impl_finalize (GObject *object) MetaSeatImpl *seat = META_SEAT_IMPL (object); GSList *iter; + g_main_loop_quit (seat->input_loop); + g_thread_join (seat->input_thread); + for (iter = seat->devices; iter; iter = g_slist_next (iter)) { ClutterInputDevice *device = iter->data; @@ -2769,6 +2845,12 @@ meta_seat_impl_query_state (MetaSeatImpl *seat, return retval; } +static void +meta_seat_impl_initable_iface_init (GInitableIface *iface) +{ + iface->init = meta_seat_impl_initable_init; +} + static void meta_seat_impl_class_init (MetaSeatImplClass *klass) { @@ -3304,10 +3386,11 @@ MetaSeatImpl * meta_seat_impl_new (MetaSeatNative *seat, const gchar *seat_id) { - return g_object_new (META_TYPE_SEAT_IMPL, - "seat", seat, - "seat-id", seat_id, - NULL); + return g_initable_new (META_TYPE_SEAT_IMPL, + NULL, NULL, + "seat", seat, + "seat-id", seat_id, + NULL); } void @@ -3320,8 +3403,7 @@ meta_seat_impl_notify_kbd_a11y_flags_changed (MetaSeatImpl *impl, input_settings = impl->input_settings; meta_input_settings_notify_kbd_a11y_change (input_settings, new_flags, what_changed); - g_signal_emit (impl, signals[KBD_A11Y_FLAGS_CHANGED], 0, - new_flags, what_changed); + emit_signal (impl, signals[KBD_A11Y_FLAGS_CHANGED], new_flags, what_changed); } void @@ -3329,14 +3411,14 @@ meta_seat_impl_notify_kbd_a11y_mods_state_changed (MetaSeatImpl *impl, xkb_mod_mask_t new_latched_mods, xkb_mod_mask_t new_locked_mods) { - g_signal_emit (impl, signals[KBD_A11Y_MODS_STATE_CHANGED], 0, + emit_signal (impl, signals[KBD_A11Y_MODS_STATE_CHANGED], new_latched_mods, new_locked_mods); } void meta_seat_impl_notify_bell (MetaSeatImpl *impl) { - g_signal_emit (impl, signals[BELL], 0); + emit_signal (impl, signals[BELL], 0, 0); } MetaInputSettings * diff --git a/src/backends/native/meta-seat-impl.h b/src/backends/native/meta-seat-impl.h index 76795493a..fa9fc2eaa 100644 --- a/src/backends/native/meta-seat-impl.h +++ b/src/backends/native/meta-seat-impl.h @@ -54,7 +54,11 @@ struct _MetaSeatImpl { GObject parent_instance; + GMainContext *caller_context; GMainContext *input_context; + GMainLoop *input_loop; + GThread *input_thread; + MetaSeatNative *seat; char *seat_id; MetaEventSource *event_source; @@ -94,6 +98,7 @@ struct _MetaSeatImpl guint has_touchscreen : 1; guint has_tablet_switch : 1; guint touch_mode : 1; + guint input_thread_initialized : 1; /* keyboard repeat */ gboolean repeat;