Re: Freezing a task

[Simon Wright <simon@pushface.org>]

"Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> writes:

> On Thu, 17 Nov 2011 16:00:17 +0000, Simon Wright wrote:
>
>> "Rego, P." <pvrego@gmail.com> writes:
>> 
>>> Is there a more elegant way to do this? Maybe some procedure
>>> My_Task.FreezeNow in a unknown (by me) package? Thanks
>> 
>> Well, you could do it in the debugger :-)
>> 
>> Programmatically, no. Your choices for inter-task comms are (a) the
>> rendezvous, (b) polling some shared resource (eg a protected object),
>> (c) something using sockets.
>> 
>> Or you could unilaterally abort the task, which would be the end of it.
>> 
>> For (a), maybe something like
>> 
>> loop
>>    select
>>       accept Pause;
>>       accept Continue;
>>    else
>>       null;
>>    end select;
>>    --  do stuff
>> end loop;
>
> If using select statement for accepting entry calls then:
>
>    Paused : Boolean := False;
> begin
>    loop
>       if Paused then
>          accept Release;
>          Paused := False;
>       else
>          select
>             accept Pause;
>             Paused := True;
>          else
>             ... -- Do stuff
>          end select;
>       end if;
>    end loop;

OK, but mine works too as long as you treat it with care! (BTW I agree
about the protected object being a better choice)