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compositor: Destroy window actors list on destruction

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When the compositor is destroyed we should cleanup the list of window actors we
created and destroy them.
Since all the actors are added to the window_group or top_window_group we can
just destroy these containers (together with the feedback_group), and simply
free the windows list.

This is particularly needed under X11 because before we destroy the display, we
might do some cleanups as detaching the surface pixmaps and freeing the damages
and if this happens at later point (for example when triggered by garbage
collector in gnome-shell), we might crash because the x11 dpy reference is
already gone.

Destroying the window actors instead, ensures we avoid any further call to X11
related functions and that we release the actors XServer resources.

Fixes https://gitlab.gnome.org/GNOME/mutter/issues/576


(cherry picked from commit 7718e67f5c)
This commit is contained in:
Marco Trevisan (Treviño) 2019-04-29 19:57:03 +00:00 committed by Marco Trevisan
parent 9a795d3d0f
commit 3495a43810
1 changed files with 17 additions and 0 deletions
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17
src/compositor/compositor.c
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@ -92,6 +92,10 @@ on_presented (ClutterStage *stage,
ClutterFrameInfo *frame_info,
MetaCompositor *compositor);
static void
on_top_window_actor_destroyed (MetaWindowActor *window_actor,
MetaCompositor *compositor);
static gboolean
is_modal (MetaDisplay *display)
{
@ -134,6 +138,19 @@ meta_compositor_destroy (MetaCompositor *compositor)
clutter_threads_remove_repaint_func (compositor->pre_paint_func_id);
clutter_threads_remove_repaint_func (compositor->post_paint_func_id);
if (compositor->top_window_actor)
{
g_signal_handlers_disconnect_by_func (compositor->top_window_actor,
on_top_window_actor_destroyed,
compositor);
compositor->top_window_actor = NULL;
}
g_clear_pointer (&compositor->window_group, clutter_actor_destroy);
g_clear_pointer (&compositor->top_window_group, clutter_actor_destroy);
g_clear_pointer (&compositor->feedback_group, clutter_actor_destroy);
g_clear_pointer (&compositor->windows, g_list_free);
if (compositor->have_x11_sync_object)
meta_sync_ring_destroy ();
}