| name | 0.6.6-understand-rmw_ind_004 |
| description | [0.6.6] write_phase: the final step wherein the result of the modify phase is written atomically to the target variabl |
understand-rmw_ind_004
CALL NUMBER: deep_indivisibility_prope.rmw_ind_004 : deep_c11_memory_model(3)
DEFINITION: write_phase: the final step wherein the result of the modify phase is written atomically to the target variable; this write becomes the new current value visible in the modification order for all subsequent operations.
Invoke this skill to understand rmw_ind_004 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 (d2): 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 (d2): 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 (d3): 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.
from deep_indivisibility_prope
- rmw_ind_006 (d1): 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.
CONSUMERS (what needs this)
rmw_ind_001, rmw_ind_003
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.)
