verify-disks: Explicitely state nothing has to be done
[ganeti-local] / doc / design-2.1-lock-acquire.dot
1 digraph "design-2.1-lock-acquire" {
2   graph[fontsize=8, fontname="Helvetica"]
3   node[fontsize=8, fontname="Helvetica", width="0", height="0"]
4   edge[fontsize=8, fontname="Helvetica"]
5
6   /* Actions */
7   abort[label="Abort\n(couldn't acquire)"]
8   acquire[label="Acquire lock"]
9   add_to_queue[label="Add condition to queue"]
10   wait[label="Wait for notification"]
11   remove_from_queue[label="Remove from queue"]
12
13   /* Conditions */
14   alone[label="Empty queue and can acquire?", shape=diamond]
15   have_timeout[label="Do I have timeout?", shape=diamond]
16   top_of_queue_and_can_acquire[
17     label="On top of queue and can acquire lock?",
18     shape=diamond,
19     ]
20
21   /* Lines */
22   alone->acquire[label="Yes"]
23   alone->add_to_queue[label="No"]
24
25   have_timeout->abort[label="Yes"]
26   have_timeout->wait[label="No"]
27
28   top_of_queue_and_can_acquire->acquire[label="Yes"]
29   top_of_queue_and_can_acquire->have_timeout[label="No"]
30
31   add_to_queue->wait
32   wait->top_of_queue_and_can_acquire
33   acquire->remove_from_queue
34 }