I teach operating systems and today's the first time I heard of a latch being a thing used in concurrency controlhttps://stackoverflow.com/questions/3111403/what-is-the-difference-between-a-lock-and-a-latch-in-the-context-of-concurrent-a …
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The spinlocks are used for very short locks where contention wouldn't be worth entering the kernel (but IMO adaptive locks would be a better idea).
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To complete the idiocy: In postgres there also is a latch concept, but mostly unrelated to the latch concept of database literature. It's used to wait both for IO and events like signals, processes dying and such.
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