From: oetiker <oetiker@a5681a0c-68f1-0310-ab6d-d61299d08faa>
Date: Sun, 12 Jul 2009 06:28:18 +0000 (+0000)
Subject: Do not trust cache tree pointers after releasing the cache lock.
X-Git-Url: https://git.tokkee.org/?a=commitdiff_plain;h=e78e4d19fffa47167fc3c4b3421673b1fd615f6c;p=rrdtool.git

Do not trust cache tree pointers after releasing the cache lock.
It's possible that a "FORGET" was issued in the mean time. -- kevin



git-svn-id: svn://svn.oetiker.ch/rrdtool/trunk/program@1871 a5681a0c-68f1-0310-ab6d-d61299d08faa
---

diff --git a/src/rrd_daemon.c b/src/rrd_daemon.c
index d8f140e..17ec97e 100644
--- a/src/rrd_daemon.c
+++ b/src/rrd_daemon.c
@@ -913,7 +913,14 @@ static void *queue_thread_main (void *args __attribute__((unused))) /* {{{ */
     }
 
     journal_write("wrote", file);
-    pthread_cond_broadcast(&ci->flushed);
+
+    /* Search again in the tree.  It's possible someone issued a "FORGET"
+     * while we were writing the update values. */
+    pthread_mutex_lock(&cache_lock);
+    ci = (cache_item_t *) g_tree_lookup(cache_tree, file);
+    if (ci)
+      pthread_cond_broadcast(&ci->flushed);
+    pthread_mutex_unlock(&cache_lock);
 
     rrd_free_ptrs((void ***) &values, &values_num);
     free(file);