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Re: RFC: Lightweight synchronization mechanism for gnumach v3

From: Samuel Thibault
Subject: Re: RFC: Lightweight synchronization mechanism for gnumach v3
Date: Sun, 17 Apr 2016 17:24:27 +0200
User-agent: Mutt/1.5.21+34 (58baf7c9f32f) (2010-12-30)


Agustina Arzille, on Fri 15 Apr 2016 15:13:49 -0300, wrote:
> On 2016-04-15 15:01, Samuel Thibault wrote:
> >Ah, this is yet another libpthread?  We need to converge on one
> >implementation.  There was also a proposal to just adapt nptl to Mach,
> >which is probably possible now with gsync (the BSD guys told us they
> >could do it quite easily).
> Well, what I have right now is heavily based on nptl, but there are
> some things that are different, mostly because implementing them
> in the Hurd would be very awkward, difficult, or just downright
> impossible.

Ok, but why not just fixing pthread_mutex_lock & such in our current
libpthread, instead of having yet another implementation?  How are we
supposed to handle those three implementations: Neal's, nptl, and yours?

Ideally your reimplementation is perfect and we can throw away Neal's,
but nobody can be perfect when writing a pthread library (been there,
didn't do that ;) ), so I'm really not at ease with throwing away Neal's
implementation which we have fixed over years.


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