list_empty_careful — tests whether a list is empty and not being modified
int list_empty_careful ( | const struct list_head * head); |
tests whether a list is empty _and_ checks that no other CPU might be in the process of modifying either member (next or prev)
using list_empty_careful without synchronization
can only be safe if the only activity that can happen
to the list entry is list_del_init. Eg. it cannot be used
if another CPU could re-list_add it.