Improve the lock tracking code a bit so that a bunch of old locks that threads

failed to lock don't sit around in the history.  When a lock is first locked,
this checks to see if the last lock in the list was one that was failed to be
locked.  If it is, then that was a lock that we're no longer sitting in a trylock
loop trying to lock, so just remove it.
(inspired by issue #11712)


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@104102 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/utils.c

@@ -610,7 +610,16 @@ void ast_store_lock_info(enum ast_lock_type type, const char *filename,
 		pthread_mutex_unlock(&lock_info->lock);
 		return;
 	}
-	
+
+	if (i && lock_info->locks[i].pending == -1) {
+		/* The last lock on the list was one that this thread tried to lock but
+		 * failed at doing so.  It has now moved on to something else, so remove
+		 * the old lock from the list. */
+		i--;
+		lock_info->num_locks--;
+		memset(&lock_info->locks[i], 0, sizeof(lock_info->locks[0]));
+	}
+
 	lock_info->locks[i].file = filename;
 	lock_info->locks[i].line_num = line_num;
 	lock_info->locks[i].func = func;