(Terminology) "Contended" vs "Contented" Locks
"Contended" describes a lock that different threads are trying to acquire at the same time, "Heavily-contended" if numerous threads are all trying to acquire the same lock, "uncontended" describing cases where a thread doesn't have any competition to acquire a lock.
"Contented" might be a typo, an erroneous autocorrect, or maybe an eggcorn).
Here's an example from the Oracle website, on the weblog of David Dice, a senior research scientist in Oracle who specializes in concurrency applications. If "contented" had a meaning specific to locks or multithreading I expect he would know about it. The contented typo appeared in his weblog (it's been corrected in the article text but it remains in the article url), someone commented on seeing "contented". David Dice replied:
Thanks for catching the embarrassing typo, which I just fixed! Like you, I wonder exactly what the semantics of "@contented" would mean (:>). Regards, -Dave
For some of these results Google seems to be anticipating our inability to spell. Google returns this link on the first page of matches for "contented site:oracle.com", even though the word "contented" does not appear in it.