[uniscribe] Use lazy loader

Fixes https://github.com/harfbuzz/harfbuzz/issues/1129

1 files changed, 29 insertions, 27 deletions

diff --git a/src/hb-uniscribe.cc b/src/hb-uniscribe.cc
index 5810977d..11b7384f 100644
--- a/src/hb-uniscribe.cc
+++ b/src/hb-uniscribe.cc
@@ -221,47 +221,49 @@ struct hb_uniscribe_shaper_funcs_t
     }
   }
 };
-static hb_atomic_ptr_t<hb_uniscribe_shaper_funcs_t> uniscribe_funcs;
 
-#ifdef HB_USE_ATEXIT
-static inline void
-free_uniscribe_funcs (void)
-{
-retry:
-  hb_uniscribe_shaper_funcs_t *local_uniscribe_funcs = uniscribe_funcs.get ();
-  if (unlikely (!uniscribe_funcs.cmpexch (local_uniscribe_funcs, nullptr)))
-    goto retry;
 
-  free (local_uniscribe_funcs);
-}
-#endif
+static void free_static_uniscribe_shaper_funcs (void);
 
-static hb_uniscribe_shaper_funcs_t *
-hb_uniscribe_shaper_get_funcs (void)
+static struct hb_uniscribe_shaper_funcs_lazy_loader_t : hb_lazy_loader_t<hb_uniscribe_shaper_funcs_t,
+									 hb_uniscribe_shaper_funcs_lazy_loader_t>
 {
-retry:
-  hb_uniscribe_shaper_funcs_t *funcs = uniscribe_funcs.get ();
-
-  if (unlikely (!funcs))
+  static inline hb_uniscribe_shaper_funcs_t *create (void)
   {
-    funcs = (hb_uniscribe_shaper_funcs_t *) calloc (1, sizeof (hb_uniscribe_shaper_funcs_t));
+    hb_uniscribe_shaper_funcs_t *funcs = (hb_uniscribe_shaper_funcs_t *) calloc (1, sizeof (hb_uniscribe_shaper_funcs_t));
     if (unlikely (!funcs))
       return nullptr;
 
     funcs->init ();
 
-    if (unlikely (!uniscribe_funcs.cmpexch (nullptr, funcs)))
-    {
-      free (funcs);
-      goto retry;
-    }
-
 #ifdef HB_USE_ATEXIT
-    atexit (free_uniscribe_funcs); /* First person registers atexit() callback. */
+    atexit (free_static_uniscribe_shaper_funcs);
 #endif
+
+    return funcs;
   }
+  static inline void destroy (hb_uniscribe_shaper_funcs_t *p)
+  {
+    free ((void *) p);
+  }
+  static inline hb_uniscribe_shaper_funcs_t *get_null (void)
+  {
+    return nullptr;
+  }
+} static_uniscribe_shaper_funcs;
 
-  return funcs;
+#ifdef HB_USE_ATEXIT
+static
+void free_static_uniscribe_shaper_funcs (void)
+{
+  static_uniscribe_shaper_funcs.free_instance ();
+}
+#endif
+
+static hb_uniscribe_shaper_funcs_t *
+hb_uniscribe_shaper_get_funcs (void)
+{
+  return static_uniscribe_shaper_funcs.get_unconst ();
 }