Yes, see e.g. https://www.kernel.org/doc/Documentation/RCU/rcu.txt and https://w... | Hacker News

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		noselasd on May 26, 2016 \| parent \| context \| favorite \| on: Making algorithms lock-free with Read-Copy Update ... Yes, see e.g. https://www.kernel.org/doc/Documentation/RCU/rcu.txt and https://www.kernel.org/doc/Documentation/RCU/RTFP.txt

gpderetta on May 26, 2016 [–]

I believe that the basic RCU patent has expired a few years ago. Some extensions might be still under patent. And no, I'm not going to do a google search to figure out what's patented or not (neither should you probably).

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