From owner-freebsd-current  Tue Nov  3 13:33:52 1998
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Date: Tue, 3 Nov 1998 16:33:32 -0500 (EST)
From: Daniel Eischen <eischen@vigrid.com>
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To: eischen@vigrid.com, james@westongold.com, peter@netplex.com.au
Subject: RE: Kernel threading (was Re: Thread Scheduler bug)
Cc: current@FreeBSD.ORG, jb@cimlogic.com.au, lists@tar.com
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> > From: Peter Wemm [mailto:peter@netplex.com.au]
> > Sent: Sunday, November 01, 1998 3:30 PM
> > ...
> > - a "process" (struct proc) would have one or more threads, 
> > all using the 
> > same address space, pid, signals, etc.
> > ...
>
> I'd like to suggest that threads (at least kernel threads)
> should share an address space EXCEPT for a page (or maybe
> more than one) that will have a common address in each thread.

What about same process threads executing on multiple processors?

  common_address[MAX_CPUS] ?

> This is how OS/2 (at least) handles thread specific data,
> and so far as I can tell it is potentially much cleaner
> for TSD, including errno.
>
>
> Any user-level multiplexing would need to save/restore this
> data on task switch of course and a kernel-assist that changes
> the memory map might be faster (or might not, dunno).
>
> Can I ask (plead, really) for any effort in this area to
> consider the support for inter-process synchronisation as well
> as intra-process?

Dan Eischen
eischen@vigrid.com

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