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Date:      Wed, 31 May 2000 20:20:26 -0700
From:      Jason Evans <jasone@canonware.com>
To:        "Andrew M. Miklic" <miklic@ibm.net>
Cc:        freebsd-arch@freebsd.org
Subject:   Re: LWP Support
Message-ID:  <20000531202026.A16569@blitz.canonware.com>
In-Reply-To: <3935CD62.8FA8825E@ibm.net>; from miklic@ibm.net on Wed, May 31, 2000 at 08:41:38PM -0600
References:  <3935CD62.8FA8825E@ibm.net>

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On Wed, May 31, 2000 at 08:41:38PM -0600, Andrew M. Miklic wrote:
>     I am currently working on OSF1 support for FreeBSD/Alpha, and I
> found that FreeBSD apparently has no support for any type of LWP
> mechanism--not only would LWPs make my OSF1 emulation work much easier,
> but it would also benefit anyone trying to create effective and
> efficient multi-threaded programs...
> 
>     Does anyone know if there is any work being done on this front, or
> would anyone be interested in helping me through some of the FreeBSD
> internals to start my own?

There was a lengthy discussion last winter on -arch about improving FreeBSD's
threads support, and the result of the discussion is that we're pursuing
scheduler activations (SAs) rather than LWPs.  I'm currently working out
the design on paper, and hope to be coding it soon.

It is probably possible to create a shim on top of SAs that looks like
LWPs, but this isn't something I've given much thought to.  One thing at a
time. =)

Jason


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