Re: DYNAMIC ADA TASK CREATION?

["Robert I. Eachus" <rieachus@attbi.com>]

Simon Wright wrote:

>>  How to create dynamic for example N tasks. I don't know how create N of
>>tasks and array (not list). For example user interface gets an Integer (N)
>>from user and then we create N number of Task in ADA. How to do this?Can
>>anybody help me?
> 
> 
> (uncompiled)
> 
>   task type t is
>     --  some entries
>   end t;
> 
>   task body t is
>   begin
>     --  code
>   end t;
> 
>   type ts is array (positive range <>) of t;
> 
>   n : positive;
> 
> begin
> 
>   --  read in n  
> 
>   declare
>     the_ts : ts (1 .. n);
>   begin
>     --  do something with the tasks
>     --  NB, can't pass this point until all the tasks have terminated
>   end;

Correct.  But if you don't want to get stuck there, do this instead:

     -- task type t as above
     type ta is access t;

     type ts is array (positive range <>) of ta := new t;

     n : positive;

   begin

     --  read in n

     declare
       the_ts : ts (1 .. n);
     begin
       --  do something with the tasks
       --  NB, CAN pass this once all the tasks have been created.
     end;

For an ordinary task object, the creator of the object is the master (in 
the original example, a declare block.  But for a task created by an 
allocator, the place where the access type was declared determines who 
is the master.  (In either case, if that is in a library package, the 
master is the environment task.)