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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.
http://lttng.org/urcu/
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