diff options
| author | Justus Winter <4winter@informatik.uni-hamburg.de> | 2015-07-10 11:09:09 +0200 |
|---|---|---|
| committer | Justus Winter <4winter@informatik.uni-hamburg.de> | 2015-07-26 12:14:40 +0200 |
| commit | 271d59feaee8770a54a77967417d58ccca163060 (patch) | |
| tree | 37aac28938638aab34f34c71634d2b70bc65db43 /kern/queue.h | |
| parent | 5d39c22c32805567989e08f84d74d80fef25126a (diff) | |
YYY kern: implement queue_replace
* kern/queue.h (queue_replace): New macro.
Diffstat (limited to 'kern/queue.h')
| -rw-r--r-- | kern/queue.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/kern/queue.h b/kern/queue.h index f0b4002..0080e78 100644 --- a/kern/queue.h +++ b/kern/queue.h @@ -321,6 +321,21 @@ void insque(queue_entry_t, queue_entry_t); } /* + * Macro: queue_replace + */ +#define queue_replace(head, to, from, type, field) \ + { \ + if ((head) == (from)->field.prev) \ + (head)->next = (to); \ + else \ + ((type)((from)->field.prev))->field.next = (to); \ + if ((head) == (from)->field.next) \ + (head)->prev = (to); \ + else \ + ((type)((from)->field.next))->field.prev = (to); \ +} + +/* * Macro: queue_assign */ #define queue_assign(to, from, type, field) \ |