protocon/examplespec/TokenChain.prot at trunk · ProtocolConvergence/protocon · GitHub

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constant N := 3;
constant M := 3;

shadow variable fwd[1] < 2;
shadow variable tok[N] < 2;
puppet variable x[N] < M;

((future & shadow) % puppet)
  (unique i < N : tok[i]==1);

process Bot[i < 1]
{
  write: x[i];
  read:  x[i+1];

  write: fwd[0], tok[i], tok[i+1];

  shadow:
    ( tok[i]==1 --> fwd[0]:=1; tok[i]:=0; tok[i+1]:=1; );
}

process P[i <- map tid < N-2 : tid+1]
{
  read: x[i-1];
  write: x[i];
  read: x[i+1];

  read: fwd[0];
  write: tok[i-1], tok[i], tok[i+1];

  shadow:
    ( fwd[0]==1 && tok[i]==1 --> tok[i]:=0; tok[i+1]:=1; )
    ( fwd[0]==0 && tok[i]==1 --> tok[i-1]:=1; tok[i]:=0; )
    ;
}

process Top[i <- map tid < 1 : N-1]
{
  read: x[i-1];
  write: x[i];

  write: fwd[0], tok[i-1], tok[i];

  shadow:
    ( tok[i]==1 --> fwd[0]:=0; tok[i-1]:=1; tok[i]:=0; );
}