33 lines
692 B
Text
33 lines
692 B
Text
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MODULE main
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VAR
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turn : 1..2;
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p : process user(turn, 1, 2);
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q : process user(turn, 2, 1);
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ASSIGN
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init(turn) := 1;
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SPEC -- MUTUAL EXCLUSION
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AG !(p.state = exit & q.state = exit)
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SPEC -- DEADLOCK
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AG (p.state = enter -> AF (p.state = exit | q.state = exit))
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SPEC -- INDIVIDUAL STARVATION
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AG (p.state = enter -> AF p.state = exit)
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MODULE user(turnloc, myproc, otherproc)
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VAR
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state : {enter,exit};
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ASSIGN
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init(state) := enter;
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next(state) :=
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case
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state = enter & turnloc = myproc : {enter,exit};
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state = exit : enter;
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TRUE : state;
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esac;
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next(turnloc) :=
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case
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state = exit : otherproc;
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TRUE : turnloc;
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esac;
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FAIRNESS
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running
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