* list_head and lock? @ 2013-11-18 1:19 韩磊 2013-11-18 1:48 ` anish singh 0 siblings, 1 reply; 3+ messages in thread From: 韩磊 @ 2013-11-18 1:19 UTC (permalink / raw) To: Linux Kernel Mailing List when we delete,add,search,amend the list_head,should we use spinlock or rcu in case of conflicit to list_head??? Thank you! ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: list_head and lock? 2013-11-18 1:19 list_head and lock? 韩磊 @ 2013-11-18 1:48 ` anish singh 2013-11-18 22:58 ` Paul E. McKenney 0 siblings, 1 reply; 3+ messages in thread From: anish singh @ 2013-11-18 1:48 UTC (permalink / raw) To: 韩磊; +Cc: Linux Kernel Mailing List On Sun, Nov 17, 2013 at 5:19 PM, 韩磊 <bonben1989@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. > > Thank you! > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: list_head and lock? 2013-11-18 1:48 ` anish singh @ 2013-11-18 22:58 ` Paul E. McKenney 0 siblings, 0 replies; 3+ messages in thread From: Paul E. McKenney @ 2013-11-18 22:58 UTC (permalink / raw) To: anish singh; +Cc: 韩磊, Linux Kernel Mailing List On Sun, Nov 17, 2013 at 05:48:14PM -0800, anish singh wrote: > On Sun, Nov 17, 2013 at 5:19 PM, 韩磊 <bonben1989@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 ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2013-11-18 22:58 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2013-11-18 1:19 list_head and lock? 韩磊 2013-11-18 1:48 ` anish singh 2013-11-18 22:58 ` Paul E. McKenney
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