In article <76g9ds$ura$1@nnrp1.dejanews.com>,
  dewar@gnat.com wrote:
> In article <76fe92$46c$1@platane.wanadoo.fr>,
>   "Jean-Pierre Rosen" <rosen.adalog@wanadoo.fr> wrote:
> >
> > James S. Rogers a �crit dans le message
> > <76dn7b$a35@bgtnsc03.worldnet.att.net>...
> > >Following is a modest example of what I mean about
> > >encapsulating a stream in a protected object.
> > >[snip]
> >
> > Unfortunately, all IO operations are potentially
> > blocking, and therefore not allowed from within a
> > protected operation.
> > To get the effect of mutual exclusion for procedures
> > requiring potentially blocking operations, have a look at
> > package Protection available from Adalog's components
> > page (http://perso.wanadoo.fr/adalog/compo2.htm)
>
> By the way, JPR here seems to be making the mistake of
> assuming that stream = stream_io, a common confusion. The
> original question here related to a particular
> implementation of streams that you have not seen, and you
> do not know if it does any potentially blocking operations.

Quite true. What started all this is that I was trying to use streams as a
typless buffer between two tasks. One of these tasks is Real-Time, and *can't*
wait for another task or I/O (thus the buffer).

--
T.E.D.

-----------== Posted via Deja News, The Discussion Network ==----------
http://www.dejanews.com/       Search, Read, Discuss, or Start Your Own