30 lines
No EOL
565 B
Text
30 lines
No EOL
565 B
Text
MODULE main
|
|
VAR
|
|
turn : {p,q};
|
|
procp : process user(turn, p, q);
|
|
procq : process user(turn, q, p);
|
|
ASSIGN
|
|
init(turn) := p;
|
|
--SPEC
|
|
--AG (proc1.state = entering -> AF proc1.state = critical)
|
|
|
|
MODULE user(turn, myid, otherid)
|
|
VAR
|
|
state : {p1,p2,p3,p4};
|
|
ASSIGN
|
|
init(state) := p1;
|
|
next(state) :=
|
|
case
|
|
state = p1 : {p1,p2};
|
|
state = p2 & turn = myid : p3;
|
|
state = p3 : p4;
|
|
state = p4 : p1;
|
|
TRUE : state;
|
|
esac;
|
|
next(turn) :=
|
|
case
|
|
next(state) = p4 : otherid;
|
|
TRUE : turn;
|
|
esac;
|
|
FAIRNESS
|
|
running |