Commit 3caeb9d5 authored by Jacques-Henri Jourdan's avatar Jacques-Henri Jourdan
Browse files

Thread-local invariants.

parent 3c60ccc3
...@@ -83,6 +83,7 @@ program_logic/namespaces.v ...@@ -83,6 +83,7 @@ program_logic/namespaces.v
program_logic/boxes.v program_logic/boxes.v
program_logic/counter_examples.v program_logic/counter_examples.v
program_logic/iris.v program_logic/iris.v
heap_lang/lang.v heap_lang/lang.v
heap_lang/tactics.v heap_lang/tactics.v
heap_lang/wp_tactics.v heap_lang/wp_tactics.v
From iris.algebra Require Export gmap gset coPset.
From iris.proofmode Require Import invariants tactics.
Import uPred.
Definition thread_id := positive.
Class thread_localG Σ := {
tl_enabled_inG :> inG Σ (gmapUR thread_id coPset_disjR);
tl_disabled_inG :> inG Σ (gmapUR thread_id (gset_disjR positive));
tl_enabled_name : gname;
tl_disabled_name : gname
Definition tlN : namespace := nroot .@ "tl".
Section defs.
Context `{irisG Λ Σ, thread_localG Σ}.
Definition tl_tokens (tid : thread_id) (E : coPset) : iProp Σ :=
own tl_enabled_name {[ tid := CoPset E ]}.
Definition tl_inv (tid : thread_id) (N : namespace) (P : iProp Σ) : iProp Σ :=
( i, (i nclose N)
inv tlN (P own tl_disabled_name {[ tid := GSet {[i]} ]}
tl_tokens tid {[i]}))%I.
End defs.
Instance: Params (@tl_tokens) 2.
Instance: Params (@tl_inv) 4.
Section proofs.
Context `{irisG Λ Σ, thread_localG Σ}.
Lemma tid_alloc :
True =r=> tid, tl_tokens tid .
iVs (own_empty (A:=gmapUR thread_id coPset_disjR) tl_enabled_name) as "Hempty".
iVs (own_updateP with "Hempty") as (m) "[Hm Hown]".
by apply alloc_updateP' with (x:=CoPset ).
iDestruct "Hm" as %(tid & -> & _). eauto.
Lemma tl_tokens_disj tid E1 E2 :
tl_tokens tid E1 tl_tokens tid E2 (E1 E2).
by rewrite /tl_tokens -own_op op_singleton own_valid -coPset_disj_valid_op
discrete_valid singleton_valid.
Lemma tl_tokens_union tid E1 E2 :
E1 E2 tl_tokens tid (E1 E2) tl_tokens tid E1 tl_tokens tid E2.
intros ?. by rewrite /tl_tokens -own_op op_singleton coPset_disj_union.
Lemma tl_inv_alloc tid E N P : P ={E}=> tl_inv tid N P.
iIntros "HP".
iVs (own_empty (A:=gmapUR thread_id (gset_disjR positive)) tl_disabled_name)
as "Hempty".
iVs (own_updateP with "Hempty") as (m) "[Hm Hown]".
{ eapply alloc_unit_singleton_updateP' with (u:=) (i:=tid). done. apply _.
apply (gset_alloc_empty_updateP_strong' (λ i, i nclose N)).
intros Ef. exists (coPpick (nclose N coPset.of_gset Ef)).
rewrite -coPset.elem_of_of_gset comm -elem_of_difference.
apply coPpick_elem_of=> Hfin.
eapply nclose_infinite, (difference_finite_inv _ _), Hfin.
apply of_gset_finite. }
iDestruct "Hm" as %(? & -> & i & -> & ?).
iVs (inv_alloc tlN with "[-]"). 2:iVsIntro; iExists i; eauto.
iNext. iLeft. by iFrame.
Lemma tl_inv_open tid tlE E N P :
nclose tlN tlE nclose N E
tl_inv tid N P tl_tokens tid E ={tlE}= P tl_tokens tid (E N)
( P tl_tokens tid (E N) ={tlE}= tl_tokens tid E).
iIntros (??) "#Htlinv Htoks".
iDestruct "Htlinv" as (i) "[% #Hinv]".
rewrite {1 4}(union_difference_L (nclose N) E) //.
rewrite {1 5}(union_difference_L {[i]} (nclose N)) ?tl_tokens_union; try set_solver.
iDestruct "Htoks" as "[[Htoki Htoks0] Htoks1]". iFrame "Htoks0 Htoks1".
iInv tlN as "[[HP >Hdis]|>Htoki2]" "Hclose".
- iVs ("Hclose" with "[Htoki]") as "_". auto. iFrame.
iIntros "!==>[HP ?]". iFrame.
iInv tlN as "[[_ >Hdis2]|>Hitok]" "Hclose".
+ iCombine "Hdis" "Hdis2" as "Hdis".
iDestruct (own_valid with "Hdis") as %Hval.
revert Hval. rewrite op_singleton singleton_valid gset_disj_valid_op.
+ iFrame. iApply "Hclose". iNext. iLeft. by iFrame.
- iDestruct (tl_tokens_disj tid {[i]} {[i]} with "[-]") as %?. by iFrame.
End proofs.
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