+typedef gpointer flxCacheWalkCallback(flxCache *c, flxKey *pattern, flxCacheEntry *e, gpointer userdata);
+gpointer flx_cache_walk(flxCache *c, flxKey *pattern, flxCacheWalkCallback cb, gpointer userdata);
+
+gboolean flx_cache_entry_half_ttl(flxCache *c, flxCacheEntry *e);
+