(** * Lemmas about the Dry Machine*)
From mathcomp.ssreflect Require Import ssreflect ssrbool ssrnat seq ssrfun eqtype fintype finfun.
Set Implicit Arguments.
(*NOTE: because of redefinition of [val], these imports must appear after Ssreflect eqtype.*)
(* Require Import compcert.common.Events. *)
Global Notation "a # b" := (Maps.PMap.get b a) (at level 1).
(** This file holds various results about the dry machine*)
(* Find other lemmas in dry_machine_step_lemmas.v        *)
Module ThreadPoolWF.
Section ThreadPoolWF.
Context {Sem : Semantics}.
Existing Instance DryHybridMachine.dryResources.
Existing Instance OrdinalPool.OrdinalThreadPool.
(** Take an instance of the Dry Machine *)
Existing Instance DryHybridMachine.DryHybridMachineSig.

Lemma invariant_decr:
forall tp c pmap i (cnti: containsThread tp i)
(Hinv: invariant tp)
(Hdecr1: forall b ofs,
Mem.perm_order'' ((getThreadR cnti).1 # b ofs)
(pmap.1 # b ofs))
(Hdecr2: forall b ofs,
Mem.perm_order'' ((getThreadR cnti).2 # b ofs)
(pmap.2 # b ofs)),
invariant (updThread cnti c pmap).