46 lines
1.5 KiB
Text
46 lines
1.5 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); -- PROCESS: http://nusmv.fbk.eu/NuSMV/userman/v21/nusmv_3.html#SEC27
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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 = setTrue | q.state = setTrue) -> AF (p.state = critical | q.state = critical))
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CTLSPEC -- no individual starvation
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AG (p.state = setTrue -> AF p.state = critical)
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CTLSPEC
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AG (q.state = setTrue -> AF q.state = critical)
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MODULE proc(mine, other)
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VAR
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state: {local, critical, setTrue, setFalse, resetTrue, resetFalse};
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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, setTrue};
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state = setTrue & other = TRUE: resetFalse;
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state = setTrue & other = FALSE: critical;
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state = resetFalse: resetTrue;
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state = resetTrue & other = TRUE: resetFalse;
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state = resetTrue & other = FALSE: 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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state = resetTrue: TRUE;
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state = resetFalse: FALSE;
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TRUE: mine;
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esac;
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FAIRNESS
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running
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