[gvfs] Use GOnce for interface type registration

[Tomas Bzatek <tbzatek src gnome org>]

commit f389246b60f3ce6d528af01f15a296b122815cd0
Author: Tomas Bzatek <tbzatek redhat com>
Date:   Wed May 29 16:17:30 2013 +0200

    Use GOnce for interface type registration
    
    Related to https://bugs.freedesktop.org/show_bug.cgi?id=65130

 daemon/gvfsjobsource.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)
---
diff --git a/daemon/gvfsjobsource.c b/daemon/gvfsjobsource.c
index 29878cc..6d65270 100644
--- a/daemon/gvfsjobsource.c
+++ b/daemon/gvfsjobsource.c
@@ -36,9 +36,9 @@ static guint signals[LAST_SIGNAL] = { 0 };
 GType
 g_vfs_job_source_get_type (void)
 {
-  static GType vfs_job_source_type = 0;
+  static volatile gsize g_define_type_id__volatile = 0;
 
-  if (! vfs_job_source_type)
+  if (g_once_init_enter (&g_define_type_id__volatile))
     {
       static const GTypeInfo vfs_job_source_info =
       {
@@ -53,14 +53,15 @@ g_vfs_job_source_get_type (void)
        NULL
       };
 
-      vfs_job_source_type =
+      GType vfs_job_source_type =
        g_type_register_static (G_TYPE_INTERFACE, "GVfsJobSource",
                                &vfs_job_source_info, 0);
 
       g_type_interface_add_prerequisite (vfs_job_source_type, G_TYPE_OBJECT);
+      g_once_init_leave (&g_define_type_id__volatile, vfs_job_source_type);
     }
 
-  return vfs_job_source_type;
+  return g_define_type_id__volatile;
 }