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From: bryce@COGSCI.BERKELEY.EDU (Bryce Nesbitt)
Newsgroups: comp.sys.amiga
Subject: Re: Message ports in 68000
Message-ID: <8704280815.AA22323@cogsci.berkeley.edu>
Date: Tue, 28-Apr-87 04:15:12 EDT
Article-I.D.: cogsci.8704280815.AA22323
Posted: Tue Apr 28 04:15:12 1987
Date-Received: Wed, 29-Apr-87 05:38:33 EDT
References: <8704260218.AA05317@cogsci.berkeley.edu> <1764@cbmvax.cbmvax.cbm.UUCP>
Sender: daemon@ucbvax.BERKELEY.EDU
Reply-To: cogsci.berkeley.edu!bryce@cogsci.berkeley.edu (Bryce Nesbitt)
Organization: University of California, Berkeley
Lines: 24
Keywords: 68000 Message ports
Summary: Why it's ok.  Example code in comp.sources

In article <1764@cbmvax.cbmvax.cbm.UUCP> phillip@cbmvax.cbm.UUCP (Phillip Lindsay CATS) writes:
>in article <8704260218.AA05317@cogsci.berkeley.edu>, bryce@COGSCI.BERKELEY.EDU (Bryce Nesbitt) says:
>> 
>> Some time after writting a complete hyper-tiny replacment for [exec_support]
             ^^^^^
>> -	move.l	 4,a6		[;hyper cheap msg port create]
>> -    suba.l	 a1,a1
>> -	jsr	 _LVOFindTask(a6)
>> -	add.l	 #pr_MsgPort,d0
>
>NO!!! 
>	In almost every call you make to DOS *that* port is used.
>
>BTW, What happens if a TASK wants to create a port with your exec_support code?

Sorry that it was not clear that ->THIS<- was the experiment and the 
exec_support clone "rolls it's own" as is good and proper.  This was tried
only in an experimental program that fires packets directly at DOS (rather
than calling the usual stubs).  It assumes far too much for general use,
however since this was guaranteed a process, was doing the DOS work and 
was only a exploratory test probe never to leave even the security of VD0:
no danger was involved.
The several persons asked for the *real* thing, and that has been posted to
comp.sources.amiga.