Re: dynamically create tasks

[Niklas Holsti <niklas.holsti@tidorum.invalid>]

On 14-10-11 04:49 , compguy45@gmail.com wrote:
> If you have one task body and would like to create 5 of these
> tasks since there is one task body there will only be one task
> created plus main task....how would you create 20 tasks with same body?
> is there way to do this?
> 

Use task types. Instead of saying

   task My_Own_Task is
   ...
   end My_Own_Task;

say

   task type My_Own_Task is
   ...
   end My_Own_Task;

The "task body" part stays the same. Then you can create as many tasks
as you like, of this type, using what looks like a normal variable
declaration:

   Thinker, Doer, Builder, Painter : My_Own_Task;

and now all these tasks are running. You can also create arrays of tasks
in the normal way, " ... array ( ... ) of My_Own_Task", you can have
access types for tasks and use "new My_Own_Task", and so on.

(However, I would suffix task-type names with "_T", just as I do for
other types, so I would write My_Own_Task_T for the task-type name.)

Note that when you use a task type and have several tasks with the same
body, there must be some way for each task to know what *it* should do;
all tasks should of course not do exactly the same thing. One way is to
add an entry to each task and call these entries to give different
parameters to each task; another way is for each task to call some
central task or protected object to get their different parameters. You
can also give the task type discriminants that tell each task what to
do; that may be useful if you create tasks dynamically (wth "new").

-- 
Niklas Holsti
Tidorum Ltd
niklas holsti tidorum fi
      .      @       .