| 877 |
|
} |
| 878 |
|
|
| 879 |
|
/** |
| 880 |
< |
* Unlinks matched nodes encountered in a traversal from head. |
| 880 |
> |
* Unlinks matched (typically cancelled) nodes encountered in a |
| 881 |
> |
* traversal from head. |
| 882 |
|
*/ |
| 883 |
|
private void sweep() { |
| 884 |
|
for (Node p = head, s, n; p != null && (s = p.next) != null; ) { |
| 885 |
< |
if (p == s) // stale |
| 886 |
< |
p = head; |
| 886 |
< |
else if (!s.isMatched()) |
| 885 |
> |
if (!s.isMatched()) |
| 886 |
> |
// Unmatched nodes are never self-linked |
| 887 |
|
p = s; |
| 888 |
|
else if ((n = s.next) == null) // trailing node is pinned |
| 889 |
|
break; |
| 890 |
+ |
else if (s == n) // stale |
| 891 |
+ |
// No need to also check for p == s, since that implies s == n |
| 892 |
+ |
p = head; |
| 893 |
|
else |
| 894 |
|
p.casNext(s, n); |
| 895 |
|
} |
