Dear Li,
I do not understand your examples at all. Your latest solution:
> T.start
> T.timeout
> interleave {
> [] PCO1.check(receive(A))
> [] PCO2.check(receive(B))
> [] PCO3.check(receive(C))
> }
> PCO1?receive(A);
> PCO2?receive(B);
> PCO3?receive(C);
>
is very strange, you can directly write
> T.start
> T.timeout
> PCO1?receive(A);
> PCO2?receive(B);
> PCO3?receive(C);
if you expect A, B and C in PCO1, PCO2 and PCO3 after the expiration
of T.
However, your original example/problem was:
> > interleave {
> > [] PCO1?A
> > [] PCO2?A
> > [] PCO3?A
> > }
> > where should I introduce the timer operation?
If I interpret this correctly, you mean
interleave {
[] PCO1.receive(A) {}
[] PCO2.receive(B) {}
[] PCO3.receive(C) {}
}
According to your proposed check-solution above you can write:
T.start;
interleave {
[] PCO1.receive(A) {}
[] PCO2.receive(B) {}
[] PCO3.receive(C) {}
}
if (not(T.running)) {
setverdict(fail);
T.timeout; // removal of timeout
}
else {
T.stop; // stopping of running timer
}
If you need to detect the timeout during the execution of the
interleaved receive statements, you can write a special default
and activate it immediately before entering the interleave statement.
For example:
altstep MySpecialDefault () runs on MyComponenttype {
[] T.timeout {
setverdict(fail);
stop; // Stop is just one possible handling of the timeout
}
}
and in the component behaviour description:
T.start;
defaultVar := activate(MySpecialDefault);
interleave {
[] PCO1.receive(A) {}
[] PCO2.receive(B) {}
[] PCO3.receive(C) {}
}
deactivate(defaultVar);
T.stop;
Hope this helps.
Best regards
Jens
Li Zhongjie schrieb:
>
> Hi Stephen,
> Perhaps we can use check operation instead of receive, like this:
>
> T.start
> T.timeout
> interleave {
> [] PCO1.check(receive(A))
> [] PCO2.check(receive(B))
> [] PCO3.check(receive(C))
> }
> PCO1?receive(A);
> PCO2?receive(B);
> PCO3?receive(C);
>
> We first start timers and when it expires, we check the incoming ports.
> at last, we take the first PDUs in each port.
>
> But perhaps the easiest way to solve my problem is to modify the interleave
syntax and semantics to
> allow timer-guarding.
>
> BR.
> Li
>
Original Message
> From: "Stephen TOBIES" <
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> To: <
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> Sent: Monday, February 24, 2003 4:40 PM
> Subject: Re: about timer guarding interleave
>
> Hi,
>
> there is one problem with the solution that I have suggested: it is not
allowed to use guard conditions in an interleave statement... So the [not
timeout_occurred] and the [n < 3] conditions cannot be specified in an
interleave statement.
>
> BR
>
> Stephan Tobies
>
> >
Original Message
> > From: ext Li Zhongjie [
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> > Sent: 24. February 2003 04:43
> > To:
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> > Subject: about timer guarding interleave
> >
> >
> > how to guard interleave operation with a timer? Suppose I
> > want to wait A from PCO1, B from PCO2, C from PCO3
> > during T seconds. The interleave structure is like:
> >
> > interleave {
> > [] PCO1?A
> > [] PCO2?A
> > [] PCO3?A
> > }
> > where should I introduce the timer operation?
> > ---
> > Best Regards,
> >
> > Zhongjie Li
> >
> > ********************************************************************
> > * Zhongjie Li *
> > * Ph.D candidate, Department of Computer Science & Technology *
> > * Tsinghua University, Beijing, 100084, P.R.China *
> > * Tel: +86+10-62788109 Fax: +86+10-62788109 *
> > * Email:
This email address is being protected from spambots. You need JavaScript enabled to view it. *
> > ********************************************************************
> >
--
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Dr. Jens Grabowski
Institute for Telematics phone: +49 451 500 3723
University of Luebeck fax: +49 451 500 3722
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