Message Signature #300261

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(* Coq: Prova de que v1.0 viola I45 *)
Theorem gaia_v1_0_atp_unsafe :
  ¬(∀ s : gaia_state, atomic_read(s.atp) ≥ 0).
Proof.
  (* Contra-exemplo: 2 threads, race condition *)
  exists s1 s2, s1.atp = 10 /\ s2.atp = 10 /\
  atomic_sub(5, s1.atp) → s1.atp = 5 /\
  atomic_sub(10, s2.atp) → s2.atp = 0 /\
  atomic_sub(5, s1.atp) → s1.atp = -5. (* VIOLAÇÃO *)
Qed.

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0x20c2c66c89a5e18f0e4ac6d0838e73da51ac0dce923c2935dc9714372e1bff3767754fc5684a7672e106a89537b300251edd0b82bfaf248ec7f1f90152921bd31b

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Message Signature #300261