Path: utzoo!attcan!uunet!tronsbox!tron1
From: tron1@tronsbox.UUCP (HIM)
Newsgroups: comp.sys.amiga
Subject: Re: OS 101 (more questions)
Message-ID: <262201c3:6218.23comp.sys.amiga;1@tronsbox.UUCP>
Date: 10 Apr 90 17:57:53 GMT
References: <15003@snow-white.udel.EDU> <6363@umd5.umd.edu>
Lines: 37

>Resp: 22 of 22 About: Re: OS 101 (more questions)
>Author: [Steve Green] (*Masked*@umd5.umd.edu) 
>
>-Can someone tell me how the Amiga scheduler works??  Does each process get
>even time??  Priorities??
>

All processes that are "ready to run" (not waiting on I/O or other events)
are served with even time untill a higher priority task becomes ready yto
run.

>-Also, if one process is waiting for terminal I/O, is that process taken off
>the queue for cpu time or is that cpu time wasted??

Programs that are waiting for events are taken off the queue.

>-What primitives exist for a process to request more or less cpu time??
 I defer .. (I dont really know well enough to answer.)

>
>--Are any of the OS functions a process??  That is, if a process decides to
>hog the CPU, will the OS crash or get confused?

They do not HOG the CPU -- that is what pre-emptive tasking means. OS
processes (as such) run at a HIGH priority.

It is possible to run a HOG process at a high enough priority that the
system will SEEM to crash (I/O will be so slow that it would not respond) --
but the system is still sane and would be fine when that process completed.

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