return (NULL);
copy = md_entry_alloc (orig->key);
+ if (copy == NULL)
+ return (NULL);
copy->type = orig->type;
if (copy->type == MD_TYPE_STRING)
copy->value.mv_string = strdup (orig->value.mv_string);
} /* }}} meta_entry_t *md_entry_lookup */
/*
+ * Each value_list_t*, as it is going through the system, is handled by exactly
+ * one thread. Plugins which pass a value_list_t* to another thread, e.g. the
+ * rrdtool plugin, must create a copy first. The meta data within a
+ * value_list_t* is not thread safe and doesn't need to be.
+ *
+ * The meta data associated with cache entries are a different story. There, we
+ * need to ensure exclusive locking to prevent leaks and other funky business.
+ * This is ensured by the uc_meta_data_get_*() functions.
+ */
+
+/*
* Public functions
*/
meta_data_t *meta_data_create (void) /* {{{ */
if (md == NULL)
return;
- pthread_mutex_destroy(&md->lock);
md_entry_free (md->head);
pthread_mutex_destroy (&md->lock);
free (md);