Imported Upstream version 1.7.6

[platform/upstream/harfbuzz.git] / src / hb-glib.cc

diff --git a/src/hb-glib.cc b/src/hb-glib.cc
index 2b91b5b..50c30e9 100644 (file)
--- a/src/hb-glib.cc
+++ b/src/hb-glib.cc
@@ -364,25 +364,54 @@ hb_glib_unicode_decompose_compatibility (hb_unicode_funcs_t *ufuncs HB_UNUSED,
   return utf8_decomposed_len;
 }
 
+static hb_unicode_funcs_t *static_glib_funcs = nullptr;
+
+#ifdef HB_USE_ATEXIT
+static
+void free_static_glib_funcs (void)
+{
+  hb_unicode_funcs_destroy (static_glib_funcs);
+}
+#endif
+
 hb_unicode_funcs_t *
 hb_glib_get_unicode_funcs (void)
 {
-  static const hb_unicode_funcs_t _hb_glib_unicode_funcs = {
-    HB_OBJECT_HEADER_STATIC,
+retry:
+  hb_unicode_funcs_t *funcs = (hb_unicode_funcs_t *) hb_atomic_ptr_get (&static_glib_funcs);
+
+  if (unlikely (!funcs))
+  {
+    funcs = hb_unicode_funcs_create (nullptr);
 
-    NULL, /* parent */
-    true, /* immutable */
-    {
-#define HB_UNICODE_FUNC_IMPLEMENT(name) hb_glib_unicode_##name,
+#define HB_UNICODE_FUNC_IMPLEMENT(name) \
+    hb_unicode_funcs_set_##name##_func (funcs, hb_glib_unicode_##name, nullptr, nullptr);
       HB_UNICODE_FUNCS_IMPLEMENT_CALLBACKS
 #undef HB_UNICODE_FUNC_IMPLEMENT
+
+    hb_unicode_funcs_make_immutable (funcs);
+
+    if (!hb_atomic_ptr_cmpexch (&static_glib_funcs, nullptr, funcs)) {
+      hb_unicode_funcs_destroy (funcs);
+      goto retry;
     }
+
+#ifdef HB_USE_ATEXIT
+    atexit (free_static_glib_funcs); /* First person registers atexit() callback. */
+#endif
   };
 
-  return const_cast<hb_unicode_funcs_t *> (&_hb_glib_unicode_funcs);
+  return hb_unicode_funcs_reference (funcs);
 }
 
 #if GLIB_CHECK_VERSION(2,31,10)
+
+static void
+_hb_g_bytes_unref (void *data)
+{
+  g_bytes_unref ((GBytes *) data);
+}
+
 /**
  * hb_glib_blob_create:
  *
@@ -397,6 +426,6 @@ hb_glib_blob_create (GBytes *gbytes)
                         size,
                         HB_MEMORY_MODE_READONLY,
                         g_bytes_ref (gbytes),
-                        (hb_destroy_func_t) g_bytes_unref);
+                        _hb_g_bytes_unref);
 }
 #endif