Re: [LUG] Linux is 10 years old

["Bob Sarah" <wychcraft@xxxxxxxxxxxxxx>]

I have been trying to understand Jon Still's and Simon Waters's replies in
particular about threads. It is a shock to realise I have not worked on real
time systems for over 25 years.

If I understand correctly for code to support threading it must be
re-entrant?

If so, to change users are cpu registers settings placed on a stack held in
main memory? That can't be right because there would have to be a separate
stack per user else it would be LIFO. So how is it done and is this what is
meant by context switching?

What are Posix threads?

tia








----- Original Message -----
From: "Jon Still" <jon@xxxxxxxxxxx>
To: <list@xxxxxxxxxxxx>
Sent: Thursday, September 06, 2001 2:17 PM
Subject: Re: [LUG] Linux is 10 years old


> > peterbunce wrote:
> > >
> > > no ms software is  nor, sorry to say, is any flavor of linux
>
> Linux *is* multitasking and multithreaded.  There are even kernel threads.
>
> Linux does *not* do pre-emptive multitasking.  In fact, very few general
> purpose OSes do - Solaris is one of them and I forget the other.
> Pre-emptive multitasking is the domain of Real Time OSes.
>
> J.
>
> --
> Jon Still                               E-mail: jon@xxxxxxxxxxx
> System Administrator                    Web:    http://www.tertial.org/
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