linux-kernel - Re: [RELEASE] Userspace RCU 0.7.6

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Date:	Thu, 10 Jan 2013 11:42:41 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	linux-kernel@...r.kernel.org, lttng-dev@...ts.lttng.org,
	rp@...s.cs.pdx.edu,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Alan Stern <stern@...land.harvard.edu>
Subject: Re: [RELEASE] Userspace RCU 0.7.6

* Stephen Hemminger (shemminger@...tta.com) wrote:
> On Wed, 9 Jan 2013 13:46:17 -0500
> Mathieu Desnoyers <mathieu.desnoyers@...icios.com> wrote:
> 
> > liburcu is a LGPLv2.1 userspace RCU (read-copy-update) library. This
> > data synchronization library provides read-side access which scales
> > linearly with the number of cores. It does so by allowing multiples
> > copies of a given data structure to live at the same time, and by
> > monitoring the data structure accesses to detect grace periods after
> > which memory reclamation is possible.
> > 
> > liburcu-cds provides efficient data structures based on RCU and
> > lock-free algorithms. Those structures include hash tables, queues,
> > stacks, and doubly-linked lists.
> > 
> > This is a bugfix release, mainly fixing handling of processes using
> > call_rcu, then fork() without following exec(), and then continuing use
> > of synchronize_rcu() or call_rcu() in the child process. A hang in
> > synchronize_rcu() in the child could occur, which is fixed by this
> > release.
> > 
> > Changelog:
> > 2013-01-09 Userspace RCU 0.7.6
> >         * Discourage use of pthread_atfork() for call_rcu handlers
> >         * Fix call_rcu fork handling
> >         * test: fork handling
> >         * Fix TLS detection: test with linker, add --disable-compiler-tls
> >         * Cleanup: cast pthread_self() return value to unsigned long
> >         * Fallback mechanism not working on platform where TLS is unsupported
> > 
> > Project website: http://lttng.org/urcu
> > Download link: http://lttng.org/files/urcu/
> > 
> 
> Why is the git repository still at 0.7.4 and there is no tag for 0.7.6?
> Am I looking at the right place?
>   $ git remote -v
> origin	git://git.lttng.org/userspace-rcu.git (fetch)

I tried doing this to confirm:

git clone git://git.lttng.org/userspace-rcu.git
cd userspace-rcu
git tag -l

and v0.7.6 is there.

Please note that this tag is in the stable-0.7 branch (not master).

Please let me know if the problem persists for you after making sure you
use the right branch.

Thanks,

Mathieu

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