Re: dynamic multithreading

[Jeffrey Carter <jrcarter@acm.org>]

Artiom Ivanov wrote:
> As you know in many applications when using threads, we sometimes need to
> create a "tasks" dynamically (I mean at run-time).

Ada has 2 ways to dynamically create tasks:

1. Declare tasks locally

declare
    T : Some_Task_Type;
begin
    ...
end;

-- execution will not reach here until T finishes.

If necessary, the task definition can also be local. Subprograms may 
declare task objects which are local to the subprogram; the subprogram 
will not return until its local tasks finish.

2. Use access to task values

task type Whatever is ...

type Whatever_Ptr is access Whatever;

T : Whatever_Ptr;

...

T := new Whatever;

The scope in which the access type is declared will not be left until 
all tasks created using new have finished. The access values can be 
passed around, assigned, returned from functions, and so on.

-- 
Jeff Carter
"I spun around, and there I was, face to face with a
six-year-old kid. Well, I just threw my guns down and
walked away. Little bastard shot me in the ass."
Blazing Saddles