Re: [tlaplus] What's wrong with the following behaviors?

Your action does not describe the value of S2CMsgQ in the next state, only the values of S2CMsgQ[m]. In particular, you do not specify the domain of the variable, or even if it is a function at all.

You want to write

/\ S2CMsgQ' = [m \in SRVLET |-> Append(S2CMsgQ[m], ...)]

Stephan

On 22 Jul 2019, at 10:36, LUMING DONG <dongluming77@xxxxxxxxx> wrote:

I defined a array to descibe a set of ordered message queues.

CONSTANT SRVLET, \* The set of resource tcfs client

VARIABLES
S2CMsgQ, \* The Msg Queue of Server to Client TCFS Messages

TCFSInit == /\ S2CMsgQ = [Cli \in SRVLET |-> <<>>]

Then, in a certain Scenario f the NEXT state, I want to append a dedicated message to each of the QUEUE in the arrary :

/\ ( \A m \in SRVLET : S2CMsgQ[m] ' = Append(S2CMsgQ[m],[type |-> "sub notify", \* Send subed notify message to all cli
SubedList |-> GetValue(m)]))

But the TlC report the folowing runtime error:

In evaluation, the identifier S2CMsgQ is either undefined or not an operator.
line 113, col 54 to line 113, col 60 of module TCFSProtocol .

I am really confused and need your advice.

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