[gdk-pixbuf/enum-thread-safe] Make enum GType registration thread safe

[Emmanuele Bassi <ebassi src gnome org>]

commit 5ac0393304cc0d17d633e9f8c22d97d4143b6953
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed Nov 18 14:03:16 2020 +0000

    Make enum GType registration thread safe
    
    Use g_once_init_enter/leave to ensure that enumeration types can be
    registered across threads.

 gdk-pixbuf/gdk-pixbuf-enum-types.c.template | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)
---
diff --git a/gdk-pixbuf/gdk-pixbuf-enum-types.c.template b/gdk-pixbuf/gdk-pixbuf-enum-types.c.template
index a4252f336..1e30bd2b1 100644
--- a/gdk-pixbuf/gdk-pixbuf-enum-types.c.template
+++ b/gdk-pixbuf/gdk-pixbuf-enum-types.c.template
@@ -13,9 +13,9 @@
 GType
 @enum_name@_get_type (void)
 {
-    static GType etype = 0;
+    static gsize g_define_type;
 
-    if (G_UNLIKELY(etype == 0)) {
+    if (g_once_init_enter (&g_define_type)) {
         static const G@Type@Value values[] = {
 /*** END value-header ***/
 
@@ -26,9 +26,11 @@ GType
 /*** BEGIN value-tail ***/
             { 0, NULL, NULL }
         };
-        etype = g_@type@_register_static (g_intern_static_string ("@EnumName@"), values);
+        GType enum_type = g_@type@_register_static (g_intern_static_string ("@EnumName@"), values);
+
+        g_once_init_leave (&g_define_type, enum_type);
     }
-    return etype;
+    return g_define_type;
 }
 
 /*** END value-tail ***/