Provided by: linux-doc-2.6.15_2.6.15-23.39_all
list_del_rcu - deletes entry from list without re-initialization
void list_del_rcu (struct list_head * entry);
entry the element to delete from the list.
list_empty on entry does not return true after this, the entry is in an
undefined state. It is useful for RCU based lockfree traversal.
In particular, it means that we can not poison the forward pointers
that may still be used for walking the list.
The caller must take whatever precautions are necessary (such as
holding appropriate locks) to avoid racing with another list-mutation
primitive, such as list_del_rcu or list_add_rcu, running on this same
list. However, it is perfectly legal to run concurrently with the _rcu
list-traversal primitives, such as list_for_each_entry_rcu.
Note that the caller is not permitted to immediately free the newly
deleted entry. Instead, either synchronize_rcu or call_rcu must be used
to defer freeing until an RCU grace period has elapsed.