[RELEASE] Userspace RCU 0.7.6

[RELEASE] Userspace RCU 0.7.6

[Mathieu Desnoyers]

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/

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

Re: [RELEASE] Userspace RCU 0.7.6

[Stephen Hemminger]

On Wed, 9 Jan 2013 13:46:17 -0500
Mathieu Desnoyers <mathieu.desnoyers@efficios.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)

Re: [RELEASE] Userspace RCU 0.7.6

[Mathieu Desnoyers]

* Stephen Hemminger (shemminger@vyatta.com) wrote:
> On Wed, 9 Jan 2013 13:46:17 -0500
> Mathieu Desnoyers <mathieu.desnoyers@efficios.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

Re: [RELEASE] Userspace RCU 0.7.6

[Stephen Hemminger]

On Thu, 10 Jan 2013 11:42:41 -0500
Mathieu Desnoyers <mathieu.desnoyers@efficios.com> wrote:

> * Stephen Hemminger (shemminger@vyatta.com) wrote:
> > On Wed, 9 Jan 2013 13:46:17 -0500
> > Mathieu Desnoyers <mathieu.desnoyers@efficios.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
> 

Ok, I didn't see the stable branch.