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From: d88-jwa@nada.kth.se (All this was brought to you by h+@nada.kth.se  Replys via email welcome!)
Newsgroups: comp.sys.mac
Subject: Re: Hey Apple Mac engineers, answer->Ma
Message-ID: <1415@draken.nada.kth.se>
Date: 14 Aug 89 08:05:49 GMT
References: <14845@dartvax.Dartmouth.EDU> <46100321@uxe.cso.uiuc.edu>
Reply-To: h+@nada.kth.se (Jon W{tte)
Organization: Royal Institute of Technology, Stockholm, Sweden
Lines: 24

In article <46100321@uxe.cso.uiuc.edu> mcdonald@uxe.cso.uiuc.edu writes:

>Incidentally, I was using a Mac recently do some scanning (soon
>to appear as a lovely posting in sci.astro (advertisement)). It
>was running multifinder. The watch icon kept appearing and 
>there was no way to stop it except the power switch.  

This is beacause the scanner is a SCSI device, and the Mac has no way of
handling asynchronous SCSI (Because of the plusses... Do we HAVE to drag
them along for eternal time ? But there is a light at the end of the tunnel,
VM in Sys 7 ! Soon to arrive (around Sys 9 or so :-) : Protected Memory)

I once saw a "TRUE MULTITASKING" UNIX system freeze while the SCSI tape
streamer streamed. You can always use nice -20 (if you are root) etc.
There are many ways to lock up a "true" multitasking system. Try using
sockets (play "hunt" for instance) and send lots of small data. Quick.
Your system manager's gonna hate you (and have to reboot the machine)
:-(

Happy hacking anyway, sez'

h+@nada.kth.se
-- 
Loop, Endless: (n) Also called Dynamic Halt. See Endless Loop.