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Path: utzoo!mnetor!seismo!rutgers!cbmvax!carolyn
From: carolyn@cbmvax.cbm.UUCP (Carolyn Scheppner CATS)
Newsgroups: comp.sys.amiga
Subject: Re: Recent CBM upheaval
Message-ID: <1800@cbmvax.cbmvax.cbm.UUCP>
Date: Thu, 30-Apr-87 12:24:15 EDT
Article-I.D.: cbmvax.1800
Posted: Thu Apr 30 12:24:15 1987
Date-Received: Tue, 5-May-87 04:36:34 EDT
References: <11465@topaz.RUTGERS.EDU> <276@rocky.STANFORD.EDU>
Reply-To: carolyn@cbmvax.UUCP (Carolyn Scheppner CATS)
Distribution: world
Organization: Commodore Technology, West Chester, PA
Lines: 56
Keywords: Kmart list price

In article <276@rocky.STANFORD.EDU> ali@rocky.UUCP (Ali Ozer) writes:
>[]
>Along totally different lines, has anyone tried executing the
>"littletask" example from Chapter 9 of Rob Peck's book under Manx? 
>I have had no luck -- I've set the littletask stack to 10000, the main
>program stack to 40000, and still no luck. Seems like the littletask
>can do simple things like "while(1);" and function calls to other
>functions in my program, but as soon as I call an Exec function like
>(FindTask()), I get a GURU. (I realize I can't call AmigaDOS functions
>from a task. I just want to be able to call FindTask(), FindPort(),
>and Get/PutMsg()...) This program works under Lattice anyway --- At least
>the compiled version on Peck's disk does...

   The following is a re-posting of the sava4/geta4 inline assembler
required when spawning a task (or process or interrupt handler ?) with
Manx.

------------------------------------------------------------------------------------------------

(From: crunch@well.UUCP (John Draper))

    I got permission from Jim Goodnough from Manx to publish the following
information.   Manx C has some problems when spawning tasks.   It appears
that the A4 register is improperly set.    Below is some code that you
need to add to get multi-tasking to work properly.

   Before calling the "AddTask" function,  it is necessary to call the
sava4() function which is listed below.    Then, in your Task,  you need to 
call geta4().   The code below can be included in your source or be
seperately compiled and linked into your program.


/*====================================================================
  Get and Save A4 Regs code for Manx 
=====================================================================*/
 #asm
a4sav  dc.l    0
 
        public  _sava4
_sava4
        lea     a4sav,a0
        move.l  a4,(a0)
        rts
 
        public  _geta4
_geta4
        move.l  a4sav,a4
        rts
 #endasm

-- 
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Carolyn Scheppner -- CBM   >>Amiga Technical Support<<
                     UUCP  ...{allegra,caip,ihnp4,seismo}!cbmvax!carolyn 
                     PHONE 215-431-9180
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