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x11: close display in an idle function

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Closing a GdkDisplay during an event handler is not currently supported by Gdk
and it will result in a crash when doing e.g. 'mutter --replace'. Using an idle
function will close it safely in a subsequent main loop iteration.

Fixes: https://gitlab.gnome.org/GNOME/gnome-shell/issues/595
This commit is contained in:
Andrea Azzarone 2018-10-31 14:21:40 +00:00 committed by Andrea Azzarone
parent 92cccf53df
commit 31f525d566
3 changed files with 33 additions and 7 deletions
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28
src/x11/events.c
View File

@ -1138,6 +1138,18 @@ process_selection_request (MetaX11Display *x11_display,
meta_verbose ("Handled selection request\n");
}
static gboolean
close_display_idle_cb (gpointer user_data)
{
MetaX11Display *x11_display = META_X11_DISPLAY (user_data);
meta_display_close (x11_display->display,
x11_display->xselectionclear_timestamp);
x11_display->display_close_idle = 0;
return G_SOURCE_REMOVE;
}
static gboolean
process_selection_clear (MetaX11Display *x11_display,
XEvent *event)
@ -1163,8 +1175,13 @@ process_selection_clear (MetaX11Display *x11_display,
meta_verbose ("Got selection clear for on display %s\n",
x11_display->name);
meta_display_close (x11_display->display,
event->xselectionclear.time);
/* We can't close a GdkDisplay in an even handler. */
if (!x11_display->display_close_idle)
{
x11_display->xselectionclear_timestamp = event->xselectionclear.time;
x11_display->display_close_idle = g_idle_add (close_display_idle_cb, x11_display);
}
return TRUE;
}
@ -1818,11 +1835,8 @@ meta_x11_display_handle_xevent (MetaX11Display *x11_display,
{
if (process_selection_clear (x11_display, event))
{
/* This means we called meta_display_unmanage_screen, which
* means the MetaDisplay is effectively dead. We don't want
* to poke into display->current_time below, since that would
* crash, so just directly return. */
return TRUE;
bypass_gtk = TRUE;
goto out;
}
}

3
src/x11/meta-x11-display-private.h
View File

@ -92,6 +92,9 @@ struct _MetaX11Display
Atom wm_sn_atom;
guint32 wm_sn_timestamp;
guint display_close_idle;
guint32 xselectionclear_timestamp;
Window wm_cm_selection_window;
Window composite_overlay_window;

9
src/x11/meta-x11-display.c
View File

@ -215,6 +215,12 @@ meta_x11_display_dispose (GObject *object)
x11_display->gdk_display = NULL;
}
if (x11_display->display_close_idle)
{
g_source_remove (x11_display->display_close_idle);
x11_display->display_close_idle = 0;
}
g_free (x11_display->name);
x11_display->name = NULL;
@ -1186,6 +1192,9 @@ meta_x11_display_new (MetaDisplay *display, GError **error)
x11_display->timestamp_pinging_window = None;
x11_display->wm_sn_selection_window = None;
x11_display->display_close_idle = 0;
x11_display->xselectionclear_timestamp = 0;
x11_display->last_bell_time = 0;
x11_display->focus_serial = 0;
x11_display->server_focus_window = None;