0-2-1-understand-atomic-cas

name	0.2.1-understand-atomic_cas
description	[0.2.1] Compare-and-swap operation atomically loading a value, comparing it to an expected value, and storing a new va

understand-atomic_cas

CALL NUMBER: ?.atomic_cas DEFINITION: Compare-and-swap operation atomically loading a value, comparing it to an expected value, and storing a new value only if they matched, returning whether the swap occurred.

Invoke this skill to understand atomic_cas down to its primitives. The RELATIVE ROOT below is the least-fixed-point closure of everything it bundles from — the full import cone, grouped by the lib each prim comes from. Projected from a prover-typed KB (MAP/SWI-Prolog consistency gate): every reference below resolves.

THE RELATIVE ROOT (the import cone, by lib)

CONSUMERS (what needs this)

atomic_compare_exchange, mcs_lock, mcs_lock_enqueue, mcs_lock_tail

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Projected from the concurrency synchronization primitives and memory models KB (155 concepts / 137 relations) — consistency-typed by MAP; the facet list after the colon IS the cross-lib dependency web.

(leaf — this is an actual skill.)