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Date:      Mon, 4 Dec 1995 11:50:28 -0500
From:      "Garrett A. Wollman" <wollman@lcs.mit.edu>
To:        Julian Elischer <julian@ref.tfs.com>
Cc:        swaits@pr.erau.edu (Stephen Waits), questions@FreeBSD.org, proven@FreeBSD.org
Subject:   Re: Threads?  C++ Task Library?
Message-ID:  <9512041650.AA17846@halloran-eldar.lcs.mit.edu>
In-Reply-To: <199512040328.TAA02724@ref.tfs.com>
References:  <Pine.SOL.3.91.951203183149.22955C-100000@moon> <199512040328.TAA02724@ref.tfs.com>

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<<On Sun, 3 Dec 1995 19:28:18 -0800 (PST), Julian Elischer <julian@ref.tfs.com> said:

> At this time there are no KERNEL threads,

[...]

> at some stage more distant, there will be kernel support for
> threaded programming. but that's a ways off still.

It is strongly believed in some part of the research community that
implementing threads in the kernel is a Really Bad Idea(tm).  What you
actually want to do, these people say, is to implement threads in
user-space with a few hooks in the kernel (``kernel threading
assist'') to allow the user-mode thread scheduler to get control at
appropriate times.

This has the benefit that an individual program can easily specify
and/or modify its own thread-scheduling policy without affecting any
other program or requiring changes to the kernel.

-GAWollman

--
Garrett A. Wollman   | Shashish is simple, it's discreet, it's brief. ... 
wollman@lcs.mit.edu  | Shashish is the bonding of hearts in spite of distance.
Opinions not those of| It is a bond more powerful than absence.  We like people
MIT, LCS, ANA, or NSA| who like Shashish.  - Claude McKenzie + Florent Vollant



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