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Excerpts from netnews.comp.soft-sys.andrew: 17-Nov-92 message queue with
ATK Isabelle Tourneux@shamin (691)

> - is it possible to use the usual msgrcv and msgsnd in an
> infinite loop ? I have tried to put an infinite loop in the
> "controller_go" of an Adew view-controller, but it disturbs the
> usual functionnning of the controller.

Yes, the normal function of an interactive ATK function assumes that the
event loop in im/xim is run whenever waiting for input.  You could peek
into the internals of im and xim, and add the appropriate select call
and then call im_Interact(FALSE) if there is input for im.  I'm not very
familiar with message queues, as far as I can tell the only way to know
when a message has arrived is to be waiting for it, or to poll
continually.

Excerpts from netnews.comp.soft-sys.andrew: 17-Nov-92 message queue with
ATK Isabelle Tourneux@shamin (691)


> - does an object-oriented function (a sort of "im_AddMessageQueue")
> exist to set an input handler when something arrives on a
> message queue, just as it does for sockets in im_AddFileHandler ?

No.  Adding such a function might be quite difficult.  You could use
im_EnqueueEvent to periodically poll a message queue, but this could
hurt performance substantially.  

In an environment without threads I don't see how message queues make
sense to use.  (Though some of their features are certianly useful.)

If the main feature you're looking for is access control via the
permission bits, then a unix domain socket, or fifo might be better than
message queues for use with ATK.

-Rob