[pango/threadsafe-failed-attempt: 8/11] Make some pangofc hash caches really threadsafe

[Behdad Esfahbod <behdad src gnome org>]

commit 1b705389d7c15f461ebf0460e2b08f982c482667
Author: Behdad Esfahbod <behdad behdad org>
Date:   Mon Oct 15 21:25:15 2012 -0500

    Make some pangofc hash caches really threadsafe

 pango/pango-threadsafe.h |   14 ++++++++++++++
 pango/pangofc-fontmap.c  |   17 ++++++++++-------
 2 files changed, 24 insertions(+), 7 deletions(-)
---
diff --git a/pango/pango-threadsafe.h b/pango/pango-threadsafe.h
index bc18074..cf8b425 100644
--- a/pango/pango-threadsafe.h
+++ b/pango/pango-threadsafe.h
@@ -117,6 +117,20 @@ gpointer    p_hash_table_lookup            (PHashTable     *hash_table,
 }
 
 static inline
+gpointer    p_hash_table_lookup_ref        (PHashTable     *hash_table,
+                                            gconstpointer   key,
+					    gpointer (*ref_func) (gpointer))
+{
+  gpointer ret;
+  g_mutex_lock (&hash_table->mx);
+  ret = g_hash_table_lookup (hash_table->ht, key);
+  if (ret)
+    ref_func (ret);
+  g_mutex_unlock (&hash_table->mx);
+  return ret;
+}
+
+static inline
 void        p_hash_table_foreach           (PHashTable     *hash_table,
                                             GHFunc          func,
                                             gpointer        user_data)
diff --git a/pango/pangofc-fontmap.c b/pango/pangofc-fontmap.c
index 84f2b94..2e031a8 100644
--- a/pango/pangofc-fontmap.c
+++ b/pango/pangofc-fontmap.c
@@ -689,9 +689,9 @@ pango_fc_patterns_new (FcPattern *pat, PangoFcFontMap *fontmap)
   PangoFcPatterns *pats;
 
   pat = uniquify_pattern (fontmap, pat);
-  pats = p_hash_table_lookup (fontmap->priv->patterns_hash, pat);
+  pats = p_hash_table_lookup_ref (fontmap->priv->patterns_hash, pat, pango_fc_patterns_ref);
   if (pats)
-    return pango_fc_patterns_ref (pats);
+    return pats;
 
   pats = g_slice_new0 (PangoFcPatterns);
 
@@ -1218,6 +1218,7 @@ pango_fc_font_map_add (PangoFcFontMap *fcfontmap,
 
   key_copy = pango_fc_font_key_copy (key);
   _pango_fc_font_set_font_key (fcfont, key_copy);
+  /* XXXXXXXXXXX racy here? */
   p_hash_table_insert (priv->font_hash, key_copy, fcfont);
 }
 
@@ -1508,6 +1509,7 @@ uniquify_pattern (PangoFcFontMap *fcfontmap,
   PangoFcFontMapPrivate *priv = fcfontmap->priv;
   FcPattern *old_pattern;
 
+  /* XXXXXX racy here? */
   old_pattern = p_hash_table_lookup (priv->pattern_hash, pattern);
   if (old_pattern)
     {
@@ -1539,9 +1541,9 @@ pango_fc_font_map_new_font (PangoFcFontMap    *fcfontmap,
 
   pango_fc_font_key_init (&key, fcfontmap, fontset_key, match);
 
-  fcfont = p_hash_table_lookup (priv->font_hash, &key);
+  fcfont = p_hash_table_lookup_ref (priv->font_hash, &key, g_object_ref);
   if (fcfont)
-    return g_object_ref (fcfont);
+    return fcfont;
 
   class = PANGO_FC_FONT_MAP_GET_CLASS (fcfontmap);
 
@@ -1754,7 +1756,7 @@ pango_fc_font_map_load_fontset (PangoFontMap                 *fontmap,
 
   pango_fc_fontset_key_init (&key, fcfontmap, context, desc, language);
 
-  fontset = p_hash_table_lookup (priv->fontset_hash, &key);
+  fontset = p_hash_table_lookup_ref (priv->fontset_hash, &key, g_object_ref);
 
   if (G_UNLIKELY (!fontset))
     {
@@ -1764,7 +1766,7 @@ pango_fc_font_map_load_fontset (PangoFontMap                 *fontmap,
 	return NULL;
 
       fontset = pango_fc_fontset_new (&key, patterns);
-      p_hash_table_insert (priv->fontset_hash, pango_fc_fontset_get_key (fontset), fontset);
+      p_hash_table_insert (priv->fontset_hash, pango_fc_fontset_get_key (fontset), g_object_ref (fontset));
 
       pango_fc_patterns_unref (patterns);
     }
@@ -1773,7 +1775,7 @@ pango_fc_font_map_load_fontset (PangoFontMap                 *fontmap,
 
   pango_font_description_free (key.desc);
 
-  return g_object_ref (fontset);
+  return fontset;
 }
 
 /**
@@ -1812,6 +1814,7 @@ pango_fc_font_map_get_font_face_data (PangoFcFontMap *fcfontmap,
   if (FcPatternGetInteger (font_pattern, FC_INDEX, 0, &key.id) != FcResultMatch)
     return NULL;
 
+  /* XXXXXXXXXX racy here */
   data = p_hash_table_lookup (priv->font_face_data_hash, &key);
   if (G_LIKELY (data))
     return data;