0-6-4-understand-rmw-ind-006

name	0.6.4-understand-rmw_ind_006
description	[0.6.4] modification_order_commitment: the serialization of the RMW operation into the global modification order of th

understand-rmw_ind_006

CALL NUMBER: deep_indivisibility_prope.rmw_ind_006 : deep_c11_memory_model(3) DEFINITION: modification_order_commitment: the serialization of the RMW operation into the global modification order of the target atomic variable at the instant the write_phase becomes visible; this ordering point determines the value returned by concurrent operations.

Invoke this skill to understand rmw_ind_006 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)

from deep_c11_memory_model

• load_indivisibility (d1): A relaxed atomic load returns exactly one value from the modification order of the target variable; no torn read of a partial value encoded in fewer bits than the atomic word is possible.
• store_indivisibility (d1): A relaxed atomic store writes the complete value as one indivisible step; no intermediate write of a partial value encoded in fewer bits than the atomic word is observable by any thread.
• no_tearing_guarantee (d2): The guarantee that multi-byte atomic values cannot be observed in a torn state where some bytes reflect the old value and others reflect a new concurrent value.

CONSUMERS (what needs this)

rmw_ind_001, rmw_ind_004

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Projected from the concurrency synchronization primitives and memory models KB (407 concepts / 477 relations) — consistency-typed by MAP; the facet list after the colon IS the cross-lib dependency web.

(leaf — this is an actual skill.)