[totem/wip/hadess/properties-vaapi-crash-fix: 7/10] properties: Use GOnce to init GStreamer

[Bastien Nocera <hadess src gnome org>]

commit 717c3253bc3605204bcef269ba7915ad3f073ac3
Author: Bastien Nocera <hadess hadess net>
Date:   Thu Jan 10 13:28:40 2019 +0100

    properties: Use GOnce to init GStreamer
    
    This makes sure that the initialisation is thread safe.

 src/totem-properties-main.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)
---
diff --git a/src/totem-properties-main.c b/src/totem-properties-main.c
index e4b765ed..124a37ac 100644
--- a/src/totem-properties-main.c
+++ b/src/totem-properties-main.c
@@ -38,7 +38,6 @@
 #include "totem-mime-types.h"
 
 static GType tpp_type = 0;
-static gboolean backend_inited = FALSE;
 static void property_page_provider_iface_init
        (NautilusPropertyPageProviderIface *iface);
 static GList *totem_properties_get_pages
@@ -79,10 +78,18 @@ property_page_provider_iface_init (NautilusPropertyPageProviderIface *iface)
        iface->get_pages = totem_properties_get_pages;
 }
 
+static gpointer
+init_backend (gpointer data)
+{
+       gst_init (NULL, NULL);
+       return NULL;
+}
+
 static GList *
 totem_properties_get_pages (NautilusPropertyPageProvider *provider,
                             GList *files)
 {
+       static GOnce backend_inited = G_ONCE_INIT;
        NautilusFileInfo *file;
        char *uri;
        GtkWidget *page, *label;
@@ -107,10 +114,7 @@ totem_properties_get_pages (NautilusPropertyPageProvider *provider,
                return NULL;
 
        /* okay, make the page, init'ing the backend first if necessary */
-       if (backend_inited == FALSE) {
-               gst_init (NULL, NULL);
-               backend_inited = TRUE;
-       }
+       g_once (&backend_inited, init_backend, NULL);
 
        uri = nautilus_file_info_get_uri (file);
        label = gtk_label_new (_("Audio/Video"));