Re: multitasking: finishing execution

["chris.danx" <spamoff.danx@ntlworld.com>]

"Stephen Leake" <stephen.a.leake.1@gsfc.nasa.gov> wrote in message
news:usn3it31c.fsf@gsfc.nasa.gov...


> The "Ada way" to terminate a task is with a "terminate" alternative:

Yep except that task will only respond to entries.  The problem requires
that it do useful work until it is quit.  That is, the task must execute a
sequence of events repeatedly and not in response to entries, but quit when
asked to.

> select
>    accept <some entry>
> or
>    terminate;
> end select;

That forbids the use of the else block (and a delay which is currently in
charge of executing the real work the task must do.  See the ARM section
9.7.1 points 8 through 12.

> See ARM 9.7.2.

Not ARM 9.7.1 and 9.3?  9.7.2 deals with timed entries.

> It is often not obvious how to set up your task to both get some work
> done and be ready to quit when told to. But it is important to get it
> right :).

Of course :)


Chris