[RELEASE] Userspace RCU 0.12.4 and 0.13.2

From: Mathieu Desnoyers
Date: Thu Aug 18 2022 - 16:12:29 EST


[ re-sending without html headers. My email client managed to add those without me realizing it. ]

Hi,

This is stable release announcement for the Userspace RCU project.
It covers the two currently maintained stable branches: 0.12 and 0.13,
respectively with releases v0.12.4 and v0.13.2.

Especially for the spurious futex wakeup fix, users of the 0.12 and 0.13 (or older)
liburcu branches are recommended to upgrade.

* Noteworthy in these releases:

- Handle spurious futex wakeups in urcu-qsbr, urcu, urcu-wait, defer_rcu, call_rcu,
and workqueue code. This has been known to cause issues where the workqueue
worker thread spuriously takes nearly 100% of CPU time.

- Change method used by _rcu_dereference ot strip type constness.
Rather than using pointer arithmetic (which does not work with opaque types),
rely on a statement expression trick.

- Fix support for Linux systems where sysconf(_SC_NPROCESSORS_CONF) can
return a value less than max cpu id.

Project website: https://liburcu.org

Feedback is welcome!

Thanks,

Mathieu

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