From: Stephen Hemminger <shemminger@osdl.org>
To: Giacomo <delleceste@gmail.com>
Cc: netfilter devel <netfilter-devel@lists.netfilter.org>
Subject: Re: locking while reading linked lists.
Date: Wed, 23 Nov 2005 07:51:36 -0800 [thread overview]
Message-ID: <20051123075136.6036713f@localhost.localdomain> (raw)
In-Reply-To: <885896af0511230016r3eb7b0b7j@mail.gmail.com>
On Wed, 23 Nov 2005 09:16:46 +0100
Giacomo <delleceste@gmail.com> wrote:
> Good morning.
> In a packet filter which i wrote on my own, i have a linked list of structures
> which i read periodically by means of list_for_each_safe macro.
> These structures have a timer, when it expires, the entry is deleted.
> The timer can on the other way be updated by mod_timer.
>
> The context of execution is that of a software interrupt (i attach my code at
> netfilter hooks), and some times (after tenths of millions of packets filtered)
> the system goes into panic.
>
> I think i should put some locks when reading in list_for_each or when
> deleting an item, or when updating timers.
>
> I thought it was not necessary because of the atomic context.
>
> In fact, should i use read/write_lock? Or spinlocks?
Learn how to use RCU. There is lots of info in Documentation/RCU/
and there are list macro's that make it painless.
prev parent reply other threads:[~2005-11-23 15:51 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-23 8:16 locking while reading linked lists Giacomo
2005-11-23 8:17 ` Fwd: " Giacomo
2005-11-23 15:51 ` Stephen Hemminger [this message]
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