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Read-Copy Update (RCU)

RCU is a synchronization mechanism that is used in the Linux kernel to replace some uses of reader-writer locking and reference counting. The concepts behind RCU are quite simple: At its core, RCU is just a way of waiting for things to get done. However, effective use of RCU does require that you think about concurrency in a different way. RCU is only recently being added to university coursework, but fortunately there is quite a bit of documentation available:

Documentation/RCU in the Linux-kernel source tree.
A number of LWN articles, including:
User-Level Implementations of Read-Copy Update (freely available pre-publication version). See also the freely available supplementary information.
The wikipedia article.

For additional documentation on RCU, see Documentation/RCU/RTFP.txt in your friendly Linux-kernel source tree.

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- * [[http://doi.ieeecomputersociety.org/10.1109/TPDS.2011.159|User-Level Implementations of Read-Copy Update]] (freely available [[http://www.rdrop.com/users/paulmck/RCU/urcu-main-accepted.2011.08.30a.pdf|pre-publication version]]).  See also the freely available [[http://www.computer.org/cms/Computer.org/dl/trans/td/2012/02/extras/ttd2012020375s.pdf|supplementary information]].
+ * [[http://doi.ieeecomputersociety.org/10.1109/TPDS.2011.159|User-Level Implementations of Read-Copy Update]] (freely available [[http://www.rdrop.com/users/paulmck/RCU/urcu-main-accepted.2011.08.30a.pdf|pre-publication version]]).  See also the freely available [[http://www.rdrop.com/users/paulmck/RCU/|supplementary information]].