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seat-impl: Destroy libinput objects on input thread on tear down

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We didn't tear down the libinput objects in the right thread when
exiting, but did so after the input thread exited.

We also tried to destroy the libinput devices after the libinput context
was destroyed, which isn't allowed.

Fix these two issues by tearing down the libinput objects in a input
thread task that when done exits the input thread. This effectively
"flushes" the input thread tasks while destroying the libinput objects
just before the thread exits.

While it might fine to tear down libinput objects in an arbitrary (main
in this case) thread while making sure nothing pokes at it in parallel
(e.g. the input thread is gone), libinput is by definition single
threaded, and could theoretically make assumptions about this, and we
shouldn't cause any possible surprises here, so make sure to destroy it
all in the right thread.

This fixes an abort() on exit caused by an assert about invalid object
destruction in libinput.

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1663>
This commit is contained in:
Jonas Ådahl 2021-01-07 08:31:22 +01:00 committed by Marge Bot
parent 3bf1af07ed
commit 237cdeef4c
2 changed files with 26 additions and 20 deletions
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3
src/backends/native/meta-input-device-native.c
View file

@ -69,8 +69,7 @@ meta_input_device_native_finalize (GObject *object)
{
MetaInputDeviceNative *device_evdev = META_INPUT_DEVICE_NATIVE (object);
if (device_evdev->libinput_device)
libinput_device_unref (device_evdev->libinput_device);
g_warn_if_fail (!device_evdev->libinput_device);
clear_slow_keys (device_evdev);
stop_bounce_keys (device_evdev);

43
src/backends/native/meta-seat-impl.c
View file

@ -2750,18 +2750,23 @@ meta_seat_impl_get_property (GObject *object,
}
}
static void
meta_seat_impl_dispose (GObject *object)
static gboolean
destroy_in_impl (GTask *task)
{
MetaSeatImpl *seat_impl = META_SEAT_IMPL (object);
MetaSeatImpl *seat_impl = g_task_get_task_data (task);
if (seat_impl->libinput)
{
libinput_unref (seat_impl->libinput);
seat_impl->libinput = NULL;
}
g_slist_foreach (seat_impl->devices,
(GFunc) meta_input_device_native_detach_libinput_in_impl,
NULL);
g_slist_free_full (seat_impl->devices, g_object_unref);
seat_impl->devices = NULL;
G_OBJECT_CLASS (meta_seat_impl_parent_class)->dispose (object);
g_clear_pointer (&seat_impl->libinput, libinput_unref);
g_main_loop_quit (seat_impl->input_loop);
g_task_return_boolean (task, TRUE);
return G_SOURCE_REMOVE;
}
static void
@ -2769,18 +2774,21 @@ meta_seat_impl_finalize (GObject *object)
{
MetaSeatImpl *seat_impl = META_SEAT_IMPL (object);
gboolean numlock_active;
GSList *iter;
g_main_loop_quit (seat_impl->input_loop);
g_thread_join (seat_impl->input_thread);
for (iter = seat_impl->devices; iter; iter = g_slist_next (iter))
if (seat_impl->libinput)
{
ClutterInputDevice *device = iter->data;
GTask *task;
g_object_unref (device);
task = g_task_new (seat_impl, NULL, NULL, NULL);
g_task_set_task_data (task, seat_impl, NULL);
meta_seat_impl_run_input_task (seat_impl, task,
(GSourceFunc) destroy_in_impl);
g_object_unref (task);
g_thread_join (seat_impl->input_thread);
g_assert (!seat_impl->libinput);
}
g_slist_free (seat_impl->devices);
g_clear_pointer (&seat_impl->tools, g_hash_table_unref);
if (seat_impl->touch_states)
@ -2940,7 +2948,6 @@ meta_seat_impl_class_init (MetaSeatImplClass *klass)
object_class->constructed = meta_seat_impl_constructed;
object_class->set_property = meta_seat_impl_set_property;
object_class->get_property = meta_seat_impl_get_property;
object_class->dispose = meta_seat_impl_dispose;
object_class->finalize = meta_seat_impl_finalize;
props[PROP_SEAT] =