From mboxrd@z Thu Jan  1 00:00:00 1970
From: mathieu.desnoyers@efficios.com (Mathieu Desnoyers)
Date: Mon, 27 Jul 2015 17:12:03 +0000 (UTC)
Subject: [lttng-dev] cds_lfht_resize() and QSBR
In-Reply-To: <55B65654.7030503@orc-group.com>
References: <55B65654.7030503@orc-group.com>
Message-ID: <2071601215.2020.1438017123033.JavaMail.zimbra@efficios.com>

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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-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com