Re: [tlaplus] Checking Liveness on Windows

Hi Hillel,

Is it safe to say, by adding the Temporal inside:

Spec == Init /\ [][Next]_vars /\ Temporal

The behaviors satisfying Spec must conform to the Temporal formula.

In contrast, if we taking out the Temporal from the Spec and write in the following form:

Spec == Init /\ [][Next]_vars

and in some cfg

PROPERTY Temporal

Then those behaviors satisfying Spec will be considered valid behaviors of the Spec, but some of them will be err-ed by the TLC model checker due to violation of the Temporal formula.

On Saturday, 29 February 2020 01:18:57 UTC+8, Hillel Wayne wrote:

In that case checking liveness is equivalent to checking the statement

SpecInit /\ [][SpecNext]_vars /\ SpecLiveness => SpecLiveness

Which is vacuously true. What you want is to check SpecInit /\ [][SpecNext]_varsas a your temporal formula and then make SpecLiveness a temporal property in the IDE.

H

On 2/28/2020 11:15 AM, Amirhossein Sayyadabdi wrote:

True exactly, I have set the comobox to "Temporal formula" and I have indicated MySpec.

Amirhossein

On Fri, Feb 28, 2020 at 8:20 PM Stephan Merz <steph...@xxxxxxxxx> wrote:

Just a wild guess: did you indicate `MySpec' (instead of the default `Spec') as the specification of your system in the TLC pane of the Toolbox?

Stephan

On 28 Feb 2020, at 17:43, Amirhossein Sayyadabdi <amir.a...@xxxxxxxxx> wrote:

Hi everyone,

I am using toolbox version 1.6.0 of 10 July on Windows 10 1909.

I have defined my spec to be like this:

MySpec ==

/\ SpecInit

/\ [][SpecNext]_vars

/\ SpecLiveness

The problem is that the model checker does not check liveness at all, unless I remove /\ SpecLiveness from the spec definition above!!!

Why is this happening? Please help me.

Amirhossein

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