[mutter] native/seat-impl: Add helper for queuing main thread idle callbacks

[Marge Bot <marge-bot src gnome org>]

commit 26912523fa2427595ef043fe97ac5a5d2f6f9d60
Author: Jonas Ådahl <jadahl gmail com>
Date:   Tue Feb 23 09:01:24 2021 +0100

    native/seat-impl: Add helper for queuing main thread idle callbacks
    
    Make the emit main thread signal use it. Will be used for calling code
    on the main thread from the input thread.
    
    Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1739>

 src/backends/native/meta-seat-impl.c | 30 ++++++++++++++++++++----------
 src/backends/native/meta-seat-impl.h |  5 +++++
 2 files changed, 25 insertions(+), 10 deletions(-)
---
diff --git a/src/backends/native/meta-seat-impl.c b/src/backends/native/meta-seat-impl.c
index cce7cd33ce..e882854197 100644
--- a/src/backends/native/meta-seat-impl.c
+++ b/src/backends/native/meta-seat-impl.c
@@ -306,6 +306,22 @@ update_button_count (MetaSeatImpl *seat_impl,
     }
 }
 
+void
+meta_seat_impl_queue_main_thread_idle (MetaSeatImpl   *seat_impl,
+                                       GSourceFunc     func,
+                                       gpointer        user_data,
+                                       GDestroyNotify  destroy_notify)
+{
+  GSource *source;
+
+  source = g_idle_source_new ();
+  g_source_set_priority (source, G_PRIORITY_HIGH);
+  g_source_set_callback (source, func, user_data, destroy_notify);
+
+  g_source_attach (source, seat_impl->main_context);
+  g_source_unref (source);
+}
+
 typedef struct
 {
   MetaSeatImpl *seat_impl;
@@ -337,7 +353,6 @@ emit_signal (MetaSeatImpl *seat_impl,
              int           n_args)
 {
   MetaSeatSignalData *emit_signal_data;
-  GSource *source;
   GArray *array;
   GValue self = G_VALUE_INIT;
 
@@ -354,15 +369,10 @@ emit_signal (MetaSeatImpl *seat_impl,
   emit_signal_data->signal_id = signal_id;
   emit_signal_data->args = array;
 
-  source = g_idle_source_new ();
-  g_source_set_priority (source, G_PRIORITY_HIGH);
-  g_source_set_callback (source,
-                         (GSourceFunc) emit_signal_in_main,
-                         emit_signal_data,
-                         (GDestroyNotify) signal_data_free);
-
-  g_source_attach (source, seat_impl->main_context);
-  g_source_unref (source);
+  meta_seat_impl_queue_main_thread_idle (seat_impl,
+                                         (GSourceFunc) emit_signal_in_main,
+                                         emit_signal_data,
+                                         (GDestroyNotify) signal_data_free);
 }
 
 void
diff --git a/src/backends/native/meta-seat-impl.h b/src/backends/native/meta-seat-impl.h
index ec78a9414c..d49d1660f5 100644
--- a/src/backends/native/meta-seat-impl.h
+++ b/src/backends/native/meta-seat-impl.h
@@ -264,4 +264,9 @@ void meta_seat_impl_notify_bell_in_impl (MetaSeatImpl *seat_impl);
 
 MetaInputSettings * meta_seat_impl_get_input_settings (MetaSeatImpl *seat_impl);
 
+void meta_seat_impl_queue_main_thread_idle (MetaSeatImpl   *seat_impl,
+                                            GSourceFunc     func,
+                                            gpointer        user_data,
+                                            GDestroyNotify  destroy_notify);
+
 #endif /* META_SEAT_IMPL_H */