[pango/threadsafe-failed-attempt: 7/11] Make fontset cache threadsafe

[Behdad Esfahbod <behdad src gnome org>]

commit 8fe4d29b944e7cfcc9d7a998be9fbadcbe0c3fb9
Author: Behdad Esfahbod <behdad behdad org>
Date:   Mon Oct 15 21:07:59 2012 -0500

    Make fontset cache threadsafe
    
    I still see crashes in there though.  Investigating.

 pango/pangofc-fontmap.c |   11 ++++++++++-
 1 files changed, 10 insertions(+), 1 deletions(-)
---
diff --git a/pango/pangofc-fontmap.c b/pango/pangofc-fontmap.c
index 6e47d08..84f2b94 100644
--- a/pango/pangofc-fontmap.c
+++ b/pango/pangofc-fontmap.c
@@ -109,6 +109,7 @@ struct _PangoFcFontMapPrivate
 {
   PHashTable *fontset_hash;	/* Maps PangoFcFontsetKey -> PangoFcFontset  */
   GQueue *fontset_cache;	/* Recently used fontsets */
+  GMutex fontset_cache_lock;
 
   PHashTable *font_hash;	/* Maps PangoFcFontKey -> PangoFcFont */
 
@@ -1081,6 +1082,9 @@ pango_fc_font_map_fini (PangoFcFontMap *fcfontmap)
   g_queue_free (priv->fontset_cache);
   priv->fontset_cache = NULL;
 
+  if (priv->fontset_cache_lock.p) /* Work around bug 686192 */
+    g_mutex_clear (&priv->fontset_cache_lock);
+
   p_hash_table_destroy (priv->fontset_hash);
   priv->fontset_hash = NULL;
 
@@ -1702,10 +1706,12 @@ pango_fc_fontset_cache (PangoFcFontset *fontset,
   PangoFcFontMapPrivate *priv = fcfontmap->priv;
   GQueue *cache = priv->fontset_cache;
 
+  g_mutex_lock (&priv->fontset_cache_lock);
+
   if (fontset->cache_link)
     {
       if (fontset->cache_link == cache->head)
-        return;
+        goto done;
 
       /* Already in cache, move to head
        */
@@ -1730,6 +1736,9 @@ pango_fc_fontset_cache (PangoFcFontset *fontset,
     }
 
   g_queue_push_head_link (cache, fontset->cache_link);
+
+done:
+  g_mutex_unlock (&priv->fontset_cache_lock);
 }
 
 static PangoFontset *