[pango] Make static data thread safe in pangoft2-fontmap.c

[Behdad Esfahbod <behdad src gnome org>]

commit 43f077b4bd6710b27645add20af26234e0266052
Author: Alessandro Pignotti <a pignotti sssup it>
Date:   Wed May 25 16:55:58 2011 +0200

    Make static data thread safe in pangoft2-fontmap.c

 pango/pangoft2-fontmap.c |    6 ++----
 1 files changed, 2 insertions(+), 4 deletions(-)
---
diff --git a/pango/pangoft2-fontmap.c b/pango/pangoft2-fontmap.c
index 3da0f16..c3a8439 100644
--- a/pango/pangoft2-fontmap.c
+++ b/pango/pangoft2-fontmap.c
@@ -269,10 +269,8 @@ pango_ft2_get_context (double dpi_x, double dpi_y)
 PangoFontMap *
 pango_ft2_font_map_for_display (void)
 {
-  if (pango_ft2_global_fontmap != NULL)
-    return PANGO_FONT_MAP (pango_ft2_global_fontmap);
-
-  pango_ft2_global_fontmap = (PangoFT2FontMap *)pango_ft2_font_map_new ();
+  if (g_once_init_enter ((gsize*)&pango_ft2_global_fontmap))
+    g_once_init_leave((gsize*)&pango_ft2_global_fontmap, (gsize)pango_ft2_font_map_new ());
 
   return PANGO_FONT_MAP (pango_ft2_global_fontmap);
 }