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Date: 14 Nov 91 03:13:50 GMT
From: ogicse!milton!mfeldman@uunet.uu.net  (Michael Feldman)
Subject: Re: HELP! HELP!  Dynamic InterTask Communication between different Pac
kages
Message-ID: <1991Nov14.031350.28704@milton.u.washington.edu>
List-Id: <comp.lang.ada>

In article <13NOV199116031506@elroy.uh.edu> cosc143u@elroy.uh.edu (91F9774) wri
tes:
 [ stuff deleted ]

>I know this is possible in Ada, but so far, no luck.  What is wrong with my
>approach (example code follows).  Thanks in advance for any help.
>.
>package t is
>    task type taskt is
>	entry callt;
>    end taskt;
>end package t;
>package body t is
>    task type taskt is
>    begin
>       accept callt;
>       taskp.callp;
>    end taskt;
>end t;
> .
>package p is
>    task type taskp is
>	entry callp;
>    end taskp;
>end package p;
>package body p is
>    task type taskp is
>    begin
>       accept callp;
>       taskt.callt;
>    end taskp;
>end p;
>
You're on the right track. You just need to get the compilation order
right. Add to package body (NOT spec) p the line
  with t;
and to the package body t the line
  with p;
then compile in the following order:
  spec of t
  spec of p
  body of t
  body of p

also the entry calls need to be qualified with the package names, e.g.
  t.taskt.callt
(or you can use a USE clause to get the same effect, if you don't
mind USEs).

You'll also need a main program that with's both packages, even if it's
a begin-null-end main (you need something to cause the packages to
be elaborated, in order to activate the tasks).

Write back by personal mail if you have more questions. Good luck.

Mike

-------------------------------------------------------------------------------
Michael B. Feldman
Visiting Professor 1991-92               Professor
Dept. of Comp. Sci. and Engrg.           Dept. of Elect. Engrg. and Comp. Sci.
University of Washington FR-35           The George Washington University
Seattle, WA 98105                        Washington, DC 20052

mfeldman@cs.washington.edu               mfeldman@seas.gwu.edu
(206) 632-3794 (voice)                   (202) 994-5253 (voice)
(206) 543-2969 (fax)                     (202) 994-5296 (fax)
-------------------------------------------------------------------------------