Tasks sharing a protected object

Tasks sharing a protected object

[Martin Magnusson]

I want to have two tasks sharing a protected object with data used by
both tasks. How do I make them see the same object? I have three
files defining the different types, skeletons for them are shown
below. How can I set the object to use when declaring the task types?

--------

package Agent is
   task type Agent_Task is
      ...
end Agent;

--------

package Environment is
   task type Environment_Task is
      ...
end Environment;

--------

package Shared_Data is
   protected type Shared_Data_Type is
      ...
end Shared_Data;

Re: Tasks sharing a protected object

[Ted Dennison]

In article <n6i669233gp.fsf@mink.it.uu.se>, Martin Magnusson says...
>
>I want to have two tasks sharing a protected object with data used by
>both tasks. How do I make them see the same object? I have three
>files defining the different types, skeletons for them are shown
>below. How can I set the object to use when declaring the task types?

Pretty simple. Either:

o  Put it in a package spec that both can "with", or 
o  Make them task *types* with the protected type as a discriminint, then pass
the proper object in when they are created, or
o  Make an "initialize" rendezvous for both tasks, and pass the protected object
in as a parameter.

---
T.E.D.    homepage   - http://www.telepath.com/dennison/Ted/TED.html

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Re: Tasks sharing a protected object

[Tony Gair]

Are you sure ted that the protected object will work that way,
I thought the data storing package would have to be the parent of both tasks
sharing the data,

are you sure that two identical protected objects (with different data would
be created....

one sure way is two adasocket the storing task ala S.Tardeau



"Ted Dennison" <dennison@telepath.com> wrote in message
news:YJeC7.1486$xS6.2081@www.newsranger.com...
> In article <n6i669233gp.fsf@mink.it.uu.se>, Martin Magnusson says...
> >
> >I want to have two tasks sharing a protected object with data used by
> >both tasks. How do I make them see the same object? I have three
> >files defining the different types, skeletons for them are shown
> >below. How can I set the object to use when declaring the task types?
>
> Pretty simple. Either:
>
> o  Put it in a package spec that both can "with", or
> o  Make them task *types* with the protected type as a discriminint, then
pass
> the proper object in when they are created, or
> o  Make an "initialize" rendezvous for both tasks, and pass the protected
object
> in as a parameter.
>
> ---
> T.E.D.    homepage   - http://www.telepath.com/dennison/Ted/TED.html
>
> No trees were killed in the sending of this message.
> However a large number of electrons were terribly inconvenienced.

Re: Tasks sharing a protected object

[Ted Dennison]

In article <9rnime$5cc$1@neptunium.btinternet.com>, Tony Gair says...
>
>Are you sure ted that the protected object will work that way,
>I thought the data storing package would have to be the parent of both tasks
>sharing the data,
>
>are you sure that two identical protected objects (with different data would
>be created....

>"Ted Dennison" <dennison@telepath.com> wrote in message
>news:YJeC7.1486$xS6.2081@www.newsranger.com...
>> o  Make them task *types* with the protected type as a discriminint, then
>pass

A discriminant has to be a "discrete or access subtype". That means that you'd
really have to pass in a *pointer* to the protected object (I was sort of
glossing over that bit for simplicity). That means that they would indeed be the
same protected object, unless you purposely make it otherwise.

---
T.E.D.    homepage   - http://www.telepath.com/dennison/Ted/TED.html

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However a large number of electrons were terribly inconvenienced.

Re: Tasks sharing a protected object

[Wes Groleau]

Martin Magnusson wrote:
> 
> I want to have two tasks sharing a protected object with data used by
> both tasks. How do I make them see the same object? I have three
> files defining the different types, skeletons for them are shown
> below. How can I set the object to use when declaring the task types?

Put them all in the same package--obviously they're related.

Or put the common stuff in one package and put the tasks
in child packages.

If you want the common stuff visible only to those tasks,
put it in a private child.

-- 
Wes Groleau
http://freepages.rootsweb.com/~wgroleau