[lttng-dev] Do updaters of a cds_lfht need to be synchronized?

[Charles Jacobsen]

The documentation for the lock-free hash table does not mention anything about synchronizing updaters (e.g., with a lock):


https://lwn.net/Articles/573431/

<https://lwn.net/Articles/573431/>https://lwn.net/Articles/573432/


The source for rculfhash (== cds_lfht?) also mentions in the comments that add and remove are lock free:


https://github.com/urcu/userspace-rcu/blob/master/src/rculfhash.c


Is it safe to assume that cds_lfht_add, cds_lfht_add_unique, and so on, *only* require a surrounding rcu read lock/unlock?


"lock free" is part of the name, so I would assume the answer is "yes".


Thank you.

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