43 lines
1.2 KiB
Text
43 lines
1.2 KiB
Text
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MODULE main
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VAR
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wantP: boolean;
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wantQ: boolean;
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p: process proc(wantP, wantQ);
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q: process proc(wantQ, wantP);
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ASSIGN
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init(wantP) := FALSE;
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init(wantQ) := FALSE;
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CTLSPEC -- no mutual exclusion
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AG (p.state != critical | q.state != critical)
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CTLSPEC -- no deadlock
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AG ((p.state = await | q.state = await) -> AF (p.state = critical | q.state = critical))
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CTLSPEC -- no individual starvation
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AG (p.state = await -> AF p.state = critical)
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CTLSPEC
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AG (q.state = await -> AF q.state = critical)
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CTLSPEC -- prova: path senza starvation
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AG (q.state = await -> EF q.state = critical)
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MODULE proc(mine, other)
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VAR
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state: {local, await, critical, setTrue, setFalse};
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ASSIGN
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init(state) := local;
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next(state) := case
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state = local: {local, await};
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state = await & other = FALSE: setTrue;
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state = await: await;
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state = setTrue: critical;
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state = critical: setFalse;
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state = setFalse: local;
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esac;
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next(mine) := case
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state = setTrue: TRUE;
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state = setFalse: FALSE;
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TRUE: mine;
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esac;
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