On Tue, 2015-02-10 at 20:10 +0000, Ian Jackson wrote: > + /* > + * For nested aos: > + * Semantically, cancellation affects the whole tree of aos, > + * not just the parent. > + * libxl__ao_cancellable.ao refers to the child, so > + * that the child callback sees the right ao. (After all, > + * it was code dealing with the child that set .ao.) > + * But, the cancellable is recorded on the "cancellables" list > + * for the ultimate root ao, so that every possible child > + * cancellation occurs as a result of the cancellation of the > + * parent. > + * We set ao->cancelling only in the root. > + */
WRT this, given a tree of ao's, which ones need to be cancellable for a cancellation to succeed? I would assume all of them do, or else the cancellation can only occur if/when the non-cancellable ones happen to end? Do we(/are we going to) take steps to stop new non-cancellable ao's to the tree once the root is cancelled? Ian. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
