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

[Behdad Esfahbod <behdad src gnome org>]

commit b47c2247e398bdb56f929a1144d6cc0b995233b0
Author: Alessandro Pignotti <a pignotti sssup it>
Date:   Wed May 18 19:49:51 2011 +0200

    Make static data thread safe in pango-utils.c

 pango/pango-utils.c |   22 +++++++++++++---------
 1 files changed, 13 insertions(+), 9 deletions(-)
---
diff --git a/pango/pango-utils.c b/pango/pango-utils.c
index dbf0602..c753683 100644
--- a/pango/pango-utils.c
+++ b/pango/pango-utils.c
@@ -719,19 +719,21 @@ pango_get_sysconf_subdirectory (void)
 {
   static const gchar *result = NULL;
 
-  if (result == NULL)
+  if (g_once_init_enter ((gsize*)&result))
     {
+      gchar *tmp_result = NULL;
 #ifdef G_OS_WIN32
       gchar *root = g_win32_get_package_installation_directory_of_module (pango_dll);
-      result = g_build_filename (root, "etc\\pango", NULL);
+      tmp_result = g_build_filename (root, "etc\\pango", NULL);
       g_free (root);
 #else
       const char *sysconfdir = g_getenv ("PANGO_SYSCONFDIR");
       if (sysconfdir != NULL)
-	result = g_build_filename (sysconfdir, "pango", NULL);
+	tmp_result = g_build_filename (sysconfdir, "pango", NULL);
       else
-	result = SYSCONFDIR "/pango";
+	tmp_result = SYSCONFDIR "/pango";
 #endif
+      g_once_init_leave((gsize*)&result, (gsize)tmp_result);
     }
   return result;
 }
@@ -752,25 +754,27 @@ pango_get_lib_subdirectory (void)
 {
   static const gchar *result = NULL;
 
-  if (result == NULL)
+  if (g_once_init_enter ((gsize*)&result))
     {
+      gchar *tmp_result = NULL;
 #ifdef G_OS_WIN32
       gchar *root = g_win32_get_package_installation_directory_of_module (pango_dll);
       /* If we are running against an uninstalled copy of the Pango DLL,
        * use the compile-time installation prefix.
        */
       if (g_str_has_suffix (root, "\\.libs"))
-	result = g_strdup (LIBDIR "/pango");
+	tmp_result = g_strdup (LIBDIR "/pango");
       else
-	result = g_build_filename (root, "lib\\pango", NULL);
+	tmp_result = g_build_filename (root, "lib\\pango", NULL);
       g_free (root);
 #else
       const char *libdir = g_getenv ("PANGO_LIBDIR");
       if (libdir != NULL)
-	result = g_build_filename (libdir, "pango", NULL);
+	tmp_result = g_build_filename (libdir, "pango", NULL);
       else
-	result = LIBDIR "/pango";
+	tmp_result = LIBDIR "/pango";
 #endif
+      g_once_init_leave((gsize*)&result, (gsize)tmp_result);
     }
   return result;
 }