Tasks sharing a protected object

[Martin Magnusson <mama7121@mink.it.uu.se>]

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;