entry references

entry references

[Ian Thomson]

Does anyone know how I can reference a protected entry?

I am trying to write a generic package that will operate
as an indirection to protected entries- and I can find no
way of referncing the entry.

I tried renaming the entry as a procedure, then passing 
this as a generic parameter, but you then get procedure-
like blocking, which defeats the object.

You also cannot declare access to subprogram types for
entries.

any ideas? thanks,

ian
______________________________________________________
                   Ian Thomson

   it103@york.ac.uk -- www-users.york.ac.uk/~it103/ 
_____you don't need eyes to see - you need vision_____

Re: entry references

[Mark Lundquist]

Ian Thomson wrote:

> Does anyone know how I can reference a protected entry?
>
> I am trying to write a generic package that will operate
> as an indirection to protected entries- and I can find no
> way of referncing the entry.
>



> I tried renaming the entry as a procedure, then passing
> this as a generic parameter, but you then get procedure-
> like blocking, which defeats the object.
>

I'm not sure what you mean by "procedure-like blocking".  What is true
is that when you rename the entry you lose its "entry-ness", so for
instance you cannot call it in places where an entry call is required,
like an asynchronous select, conditional entry call, etc.

> You also cannot declare access to subprogram types for
> entries.
>

Right, because they are not subprograms.

> any ideas? thanks,
>

It sounds like you are wishing there were such a thing as a "generic
formal entry" parameter.  Is that the idea?

Without knowing exactly what you're up to, it's hard to say (for
instance, what kind of genericity are you trying to achieve?)  One
suggestion is that your protected type can have a discriminant, and that
discriminant can be an access discriminant, and in particular it can be
a classwide access discriminant.  This allows your protected type in
effect to serve as the root of a type hierarchy, even though protected
types themselves can't be extended.  If this ends up solving your
problem, it may turn out that your package doesn't even have to be
generic after all -- as I said before, it's hard to know without more
detail...


--

Mark Lundquist
Senior Software Engineer
Rational Software
Development Solutions Business Unit
UNIX Suites Group
Aloha, OR, USA

Re: entry references

[Matthew Heaney]

In article <37DE6FC9.51FD00CE@york.ac.uk> , Ian Thomson <it103@york.ac.uk>
wrote:

> Does anyone know how I can reference a protected entry?

I'm not sure what you mean by this question.  Can you post a small snippet
of code illustrating your problem?


> I am trying to write a generic package that will operate as an indirection to
> protected entries- and I can find no way of referencing the entry.

Again, please provide a small bit of code to illustrate.


> I tried renaming the entry as a procedure, then passing this as a generic
> parameter, but you then get procedure- like blocking, which defeats the
> object.

I'm not sure what you mean by "defeats the object."  Can you elaborate on
this?  (And post some code.)


> You also cannot declare access to subprogram types for entries.

Do you really need to?  Can you point to a subprogram that calls the entry?


> any ideas? thanks,

It would be helpful if you could post the smallest amount of code that
demonstrates your problem.