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Attaching data with a timeout signal [message #1758244]

Sat, 25 March 2017 18:19

John Dawes

Messages: 19
Registered: November 2016

Junior Member

Hi,

Is it possible to attach data with a timeout signal? I tried the following to set the timer and tried to access it using *rtdata. It did not work.

int i=5;
UMLRTTimespec t1(2,0);
timer.informIn(t1, &i, &UMLRTType_int);

John

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Re: Attaching data with a timeout signal [message #1758292 is a reply to message #1758244]

Mon, 27 March 2017 08:49

Peter Cigehn

Messages: 49
Registered: September 2014

Member

Hi,

I am not fully sure what it is that did not work. I guess is that since *rtdata is a void pointer, you need to explicitly cast to an int pointer yourself, if that is what you meant did not work.

*(int *)rtdata

I have attached an small example model which demonstrates how this works.

Hope this helps,

/Peter Cigéhn

Attachment: TimerTest.zip
(Size: 5.32KB, Downloaded 149 times)

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Re: Attaching data with a timeout signal [message #1758342 is a reply to message #1758292]

Mon, 27 March 2017 20:16

Ernesto Posse

Messages: 438
Registered: March 2011

Senior Member

Yes, I can confirm that Peter's cast works.

For "normal" protocol messages, i.e. messages from user-defined protocols, the code generator will look at its parameters, and try to infer the type to use when declaring the rtdata macro in the generated code, but (at least currently) it does not do that for Timing messages, so in this case rtdata always gets typed as void * and therefore you need to cast it to the appropriate type.

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Re: Attaching data with a timeout signal [message #1758352 is a reply to message #1758342]

Tue, 28 March 2017 02:20

John Dawes

Messages: 19
Registered: November 2016

Junior Member

Thank you very much guys. It worked.

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Re: Attaching data with a timeout signal [message #1758374 is a reply to message #1758352]

Tue, 28 March 2017 07:53

Peter Cigehn

Messages: 49
Registered: September 2014

Member

Hi again,

Regarding the need for an explicit type cast in this specific case is, as Ernesto tries to explain, that the timeout protocol message can be seen as being defined with a single parameter typed by *, i.e. it can carry any data. Hence the reason why you in this specific case needed to pass along the type descriptor that it actually is an 'int' that is being sent.

So at code-generation time there is no way for the code generator to know which type is going to be sent at run-time. So the only viable solution is to provide a void pointer via rtdata.

This is the same also for user defined protocols, where you define the protocol message parameter to be typed by *, which makes it possible to pass along any type of data, including none at all. Also for those cases, rtdata will be a void pointer.

For any other case, rtdata will be typed according to the type of the (first) parameter of the protocol message. Then there should be no need for an explicit type case, since the type information already exist at code generation time (and hence type safe sends are achieved).

/Peter Cigéhn

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