Definition 1. A state of a model $\mathbf{A} = (D, B, \alpha^0)$, where $D = (A, C, \sigma)$ and $A = \{X_1,...,X_n\}$ is a tuple

$$S = (S(X_1),\dots,S(X_n)).$$

Definition 2. The initial state is defined as follows:

• am(X) = X, for any active agent X such that σ(X) = True.
• am(X) = I, for any active agent X such that σ(X) = False.
• am(X) = W, for any passive agent X.
• pc(X) = 1 for any active agent X in the running mode and pc(X) = 0 for other agents.
• ci(X) = [ ] for any active agent X.
• ci(X) contains names of all accessible procedures of X together with the direction of parameters transfer, e.g. in(a), out(b), etc. for any passive agent X.
• For any agent X, pv(X) contains X parameters with their initial values.

agent Sender {
  loop {                 -- 1   comments contain steps numbers
    out put;             -- 2
  }
}

agent Buffer {
  i :: Int = 0;
  proc (i == 0) put { 
    in put;              -- 1
    i = 1;               -- 2
  }
  proc (i /= 0) get { 
    out get;             -- 3
    i = 0;               -- 4
  }
}

agent Receiver {
  loop {                 -- 1
    in get;              -- 2
  }
}

Initial state:

S_0 = ((X,1,[],()), (W,0,[in(put)],(0)), (X,1,[],()))

See also: Sender-Buffer-Receiver example

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