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Re: [PATCH 03/10] introduce systhread layer

From: Daniel Colascione
Subject: Re: [PATCH 03/10] introduce systhread layer
Date: Thu, 09 Aug 2012 18:39:37 -0700
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On 8/9/2012 12:38 PM, Tom Tromey wrote:
> This introduces the low-level system threading support.  It also adds
> the global lock.  The low-level support is a bit over-eager, in that
> even at the end of the present series, it will not all be used.  I
> think thiat is ok since I plan to use it all eventually.
> I've only implemented the pthreads-based version.  I think it should
> be relatively clear how to port this to other systems, though.
> I'd also like to do a "no threads" port that will turn most things
> into no-ops, and have thread-creation fail.  I was thinking perhaps
> I'd make a future (provide 'threads) conditional on threads actually
> working.  Thoughts on this?

If threads don't execute simultaneously anyway (and if I understand your design
correctly, the global lock ensures they don't), then it might be worthwhile to
also support a "green threads" implementation like GNU Pth or Windows fibers in
order to avoid OS-level context switch overhead.

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