[lttng-dev] [RELEASE] Userspace RCU 0.12.4 and 0.13.2

[Mathieu Desnoyers]

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 
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