Path: utzoo!utgpu!news-server.csri.toronto.edu!mailrus!cs.utexas.edu!uunet!ogicse!oregon!jmeissen
From: jmeissen@oregon.oacis.org (John Meissen)
Newsgroups: comp.sys.amiga
Subject: Re: Problem with CreateProc & LoadSeg
Message-ID: <474@oregon.oacis.org>
Date: 4 May 90 16:24:17 GMT
References: <897@tau.sm.luth.se>
Organization: Oregon Advanced Computing Institute (OACIS), Beaverton, OR
Lines: 33

In article <897@tau.sm.luth.se> Karl-Gunnar Hultland <d87-khd@sm.luth.se> writes:
>The problem is :
>If I comment away the LoadSeg and CreateProc and start the program
>Proc.c via a different CLI it works Like a Dream. BUT if I use the
>code in Main.c I never get the window to open.
>I have verifyed with Xoper that the process exists but doesn't open 
>the window and thus it can't exit.

The problem may actually be related to the difference in the way that
Workbench and CLI start processes. With the CLI, the new code is called
as a subroutine (sort-of), and so the code is expected to fall right
into executing. With WorkBench, the process is spawned as a seperate 
task, and is expected to wait for a message from Workbench with the
arguments. These two diverse startup procedures are normally handled 
transparently in the C startup routine. In the case of Lattice (and
this was the way recommended by Amiga way back when) the choice is
made on the basis of whether or not the CLI sub-structure is present
in the process structure. i.e., if the CLI structure pointer is non-NULL,
get the argument pointer from the appropriate address register and continue
executing. If it is NULL, wait on the msgport in the process structure for
the Workbench message (which has to be returned at the end of execution).

Now the problem you face is that CreateProc doesn't create a CLI sub-structure,
so your code will think it's being spawned by Workbench and will wait for
the Workbench message. It's probably either hung there, or that piece of
the startup code ate your "hello" message and now it's waiting in the program
for another message that will never come.

-- 
 John Meissen ............................... Oregon Advanced Computing Institute
 jmeissen@oacis.org        (Internet) | "That's the remarkable thing about life;
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