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--- alvis:modelstate [2015/12/01 12:53]
marcin
+++ — (current)
@@ Line 1: / Line 1: @@
-====== Model state ======
-{{ :alvis:alvis-stan.png?450 |}}
-**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.
-===== Example: Sender-Buffer-Receiver system =====
-{{ :alvis:rbs.png?nolink |}}
-<code>
-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
-  }
-}
-</code>
-**Initial state:**
-  S_0 = ((X,1,[],()), (W,0,[in(put)],(0)), (X,1,[],()))
-**See also: [[:alvis:sbrexample|Sender-Buffer-Receiver example]]**
-**[[:alvis:manual|Go back]]**