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From iris.program_logic Require Export hoare.
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From iris.heap_lang.lib.barrier Require Export barrier.
From iris.heap_lang.lib.barrier Require Import proof.
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From iris.heap_lang Require Import proofmode.
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Import uPred.

Section spec.
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Context `{!heapG Σ} `{!barrierG Σ}.
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Lemma barrier_spec (N : namespace) :
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  heapN  N 
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   recv send : loc  iProp Σ -n> iProp Σ,
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    ( P, heap_ctx  {{ True }} newbarrier #()
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                     {{ v,  l : loc, v = #l  recv l P  send l P }}) 
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    ( l P, {{ send l P  P }} signal #l {{ _, True }}) 
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    ( l P, {{ recv l P }} wait #l {{ _, P }}) 
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    ( l P Q, recv l (P  Q) ={N}=> recv l P  recv l Q) 
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    ( l P Q, (P - Q)  recv l P - recv l Q).
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Proof.
  intros HN.
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  exists (λ l, CofeMor (recv N l)), (λ l, CofeMor (send N l)).
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  split_and?; simpl.
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  - iIntros (P) "#? !# _". iApply (newbarrier_spec _ P with "[]"); [done..|].
    iNext. eauto.
  - iIntros (l P) "!# [Hl HP]". iApply (signal_spec with "[$Hl $HP]"). by eauto.
  - iIntros (l P) "!# Hl". iApply (wait_spec with "Hl"). eauto.
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  - iIntros (l P Q) "!#". by iApply recv_split.
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  - apply recv_weaken.
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Qed.
End spec.