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Date:      Sun, 8 Mar 1998 16:29:39 +1100 (EST)
From:      John Birrell <jb@cimlogic.com.au>
To:        nate@mt.sri.com (Nate Williams)
Cc:        jb@cimlogic.com.au, mike@smith.net.au, cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG, cvs-lib@FreeBSD.ORG
Subject:   Re: cvs commit: src/lib/libc_r/uthread pthread_private.h uthread_yield.c
Message-ID:  <199803080529.QAA10869@cimlogic.com.au>
In-Reply-To: <199803080523.WAA06336@mt.sri.com> from Nate Williams at "Mar 7, 98 10:23:10 pm"

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Nate Williams wrote:
> > that it will all just come out in the wash. Kernel threads aren't
> > light weight, though.
> 
> If kernel threads aren't light-weight, then what differentiates them
> from processes?

Shared address space. The threads in user-space each have their
own stack (once you allocate it when you know you've go a new thread -
the kernel doesn't do this for you). All scheduling _currently_ uses
the process scheduler, so each thread is actually scheduled as though
it is a process, rather than fighting other threads in the same
process for the process's time allocation.

-- 
John Birrell - jb@cimlogic.com.au; jb@freebsd.org
CIMlogic Pty Ltd, GPO Box 117A, Melbourne Vic 3001, Australia +61 418 353 137

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