On Sun, Nov 17, 2013 at 05:48:14PM -0800, anish singh wrote:
> On Sun, Nov 17, 2013 at 5:19 PM, 韩磊 <bonben1...@gmail.com> wrote:
> > when we delete,add,search,amend the list_head,should we use spinlock
> > or rcu in case of conflicit to list_head???
> There is no implicit locking when we use 'list' api's.You should explicitly
> do that AFAIK.
See Documentation/RCU/listRCU.txt for a summary of how to use RCU-protected
linked lists. But yes, readers need to explicitly do rcu_read_lock()
and rcu_read_unlock(), and updaters must coordinate with each others
somehow, for example, explicitly using spinlocks.
The list_head macros are about list manipulation and not so much about
synchronization.
Thanx, Paul
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