Parallele_Verteilte_Systeme/mCRL2/TrafficLights/v3/v3_spec.mcrl2

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%-----------------------------------------------------------------------
sort
CardinalDirection = struct north | east | south | west;
%-----------------------------------------------------------------------
sort
Colour = struct red | green | yellow;
map
nextColour: Colour -> Colour;
eqn
nextColour(red) = green;
nextColour(green) = yellow;
nextColour(yellow) = red;
%------------------------------------------------------------------------
sort
Map = K -> V;
map
_Map: V -> Map;
var
k: K;
v: V;
eqn
_Map(v)(k) = v;
sort
K = CardinalDirection;
V = Colour;
map
combinations: Map;
%------------------------------------------------------------------------
act
show : CardinalDirection # Colour;
seeColour : CardinalDirection # Colour;
colourSeen : CardinalDirection # Colour;
%------------------------------------------------------------------------
proc
TrafficLight(direction : CardinalDirection) = TL(direction, red);
TL(direction : CardinalDirection, colour : Colour) =
show(direction, colour) . TL(direction, nextColour(colour))
;
Monitor(status : Map) =
sum direction : CardinalDirection.(
sum c : Colour .
(c == green) ->
(direction == north || direction == south) ->
((status(east) == red && status(west) == red) -> % sind die anderen Ampeln rot ?
seeColour(direction, c) . Monitor(status= status[direction -> c])) % dann darf fortgefahren werden
<>
((status(north) == red && status(south) == red) ->
seeColour(direction, c) . Monitor(status= status[direction -> c]))
<> %soll nicht grün gezeigt werden kann einfach fortgefahren werden, es wurde ja bereits überprüft
seeColour(direction, c) .
Monitor(status= status[direction -> c])
);
System =
allow({
colourSeen
},
comm({
show | seeColour -> colourSeen
},
TrafficLight(north) || TrafficLight(east) || TrafficLight(south) || TrafficLight(west) || Monitor(_Map(red))
));
init
System
;