From mboxrd@z Thu Jan  1 00:00:00 1970
From: Eugene.Ivanov@orc-group.com (Eugene Ivanov)
Date: Mon, 27 Jul 2015 20:20:25 +0300
Subject: [lttng-dev] cds_lfht_resize() and QSBR
In-Reply-To: <2071601215.2020.1438017123033.JavaMail.zimbra@efficios.com>
References: <55B65654.7030503@orc-group.com>
 <2071601215.2020.1438017123033.JavaMail.zimbra@efficios.com>
Message-ID: <55B66859.6050300@orc-group.com>

Thank you, Mathieu!

On 07/27/2015 08:12 PM, Mathieu Desnoyers wrote:
> Hi Eugene,
>
> It's fine to use both lfht resize and destroy from URCU QSBR, because
> we explicitly mark the threads "offline" (saving the old state),
> and restore the original state, at the beginning and end of those
> functions.
>
> However, calls to cds_lfht_resize() and cds_lfht_destroy are considered
> as an explicit quiescent state in URCU QSBR, therefore, don't expect
> your RCU read-side critical section to extend across those 2 calls.
>
> Thanks,
>
> Mathieu
>
> ----- On Jul 27, 2015, at 12:03 PM, Eugene Ivanov Eugene.Ivanov at orc-group.com wrote:
>
>> Hi,
>>
>> According documentation "cds_lfht_resize should *not* be called from a
>> RCU read-side critical section", can I use this function with QSBR,
>> where almost everything is read-side CS? And cds_lfht_destroy()?
>>
>> --
>> Eugene Ivanov
>>
>>
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--
Eugene Ivanov


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