[vhdl-200x] Re: TB: Execute procedure and return immediately

Hi Martin,
This is the classic C programming fork/join model to
concurrent execution.  We are looking for a use model
that justifies adding something like fork-join to VHDL.

Many of the use cases are for actions that are independent,
but need to be synchronized upon completion.  Generally
for these type of things, I use a separate process for
each independent interface/thread.  What I think we need
to do is to classify different concurrent communication
methods and create synchronization procedures for them.
I have some of these in my testbench utilities package.

interface1_thread : process
begin
   procedure_1(..., value, signal_a); -- execute procedure and return immediately
   BarrierSync(thread1_2) ;
   ...

end process ;

interface2_thread : process
begin
   procedure_1(..., value, signal_a); -- execute procedure and return immediately
   BarrierSync(thread1_2) ;
   ...

end process;

So we are still looking for the use model where we need to
use fork/join with a concurrent language.  I suspect it may
occur in an interface that supports both normal and split
transactions.  Just have not looked into it enough yet.

Best,
Jim


> Hello,
>
> during simulation I wanted to do something like this:
>
> process
>    procedure_1 (...,
>      signal value_proc: in integer,
>      signal signal_a_proc: out integer)
>    is begin
>      ...
>      wait for 10 ns;
>      signal_a_proc <= value_proc;
>      ...
>    end procedure_1;
>
>    procedure_2 (...,
>      signal value_proc: in integer,
>      signal signal_b_proc: out integer)
>    is begin
>      ...
>      wait for 20 ns;
>      signal_b_proc <= value_proc;
>      ...
>    end procedure_2;
> begin
>    -- execute the following two lines in parallel
>    procedure_1(..., value, signal_a); -- execute procedure and return immediately
>    procedure_2(..., value, signal_b);
>    -- end parallel execution
>    wait;
> end process;
>
> In this example I have defined two procedures. These procedures could set some signals following a certain timing. Now assume that the timing of the signals set by the two procedures are interdependent. So what I want to do is for example to start the two procedures at the same time, or to start the second procedure a specified time after the first procedure while the first one still hasn't finished exectuion.
>
> I'm not aware of a construct in VHDL which would allow this behavior. Could this be something which can be considered for a future standard of VHDL or would such a construct have too many unwanted side effects?
>
>
>
> Best regards
> i.A. Martin Stolpe
>
>
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-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Jim Lewis
Director of Training             mailto:Jim@SynthWorks.com
SynthWorks Design Inc.           http://www.SynthWorks.com
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