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Path: utzoo!mnetor!seismo!uwvax!derek
From: derek@rsch.WISC.EDU (Derek Zahn)
Newsgroups: comp.sys.amiga
Subject: MANX Multitasking
Message-ID: <3194@rsch.WISC.EDU>
Date: Wed, 4-Feb-87 11:32:30 EST
Article-I.D.: rsch.3194
Posted: Wed Feb  4 11:32:30 1987
Date-Received: Sat, 7-Feb-87 04:40:47 EST
Distribution: comp
Organization: U of Wisconsin CS Dept
Lines: 42

Is there anyone out there who has a MANX C program that spawns a child
process and then communicates with it?  I have been trying this and have
not had any success -- the parent never gets the reply to the WB startup
message.

I have a program, written at Commodore, from one of the Fish disks, that
is supposed to do this, but it apparently was not written with Manx C in
mind.  It pays little attention to the actual return types of functions

[for example (I don't know if this is really a problem since no changes of
mine helped much), the program  sets struct MsgPort *littleProc = 
CreateProc(name, 0, segment, 5000);.  My documentation says that CreateProc
returns a struct Process *, and the first field of the Process structure is
not the MsgPort structure, but the Task structure....]

and accesses stdout and stderr in a manner that makes Manx barf (even with
that fixed so that the program compiles, it crashes the Amiga).  BTW,
how does one send the parent's stdout and stderr to the child in Manx?
Is there a less contorted way to get debugging output from child processes?

Fixing the problem in brackets above stopped the program from crashing the
machine but the parent process still hangs waiting for a reply from child.

I also tried to adopt a sample program from _Inside_the_Amiga_ but it did
similar stdout things, similarly ran roughshod over return types, didn't
even call its OWN subroutines with the correct number of arguments, and
with all this fixed worked no better.

I am running version 1.1 of the system (I think -- I use the 1.1 kickstart
because if I use 1.2 with the distributed Manx disk, 'cc' won't write 
'.o' files.  I would rather run 1.2 -- does any Manx C guru know how to 
do that???) and Manx version 3.20a.  My Amiga has 512K and an external df.

Apologies in advance for any blatant ignorance, and any ideas or help would 
be greatly appreciated.

derek

-- 
Abstract:       Derek Zahn @ wisconsin
Usenet:         ...!{allegra,heurikon,ihnp4,seismo,sfwin,ucbvax}!uwvax!derek
Arpa Internet:  derek@rsch.wisc.edu