From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dario Faggioli <dario.faggioli@citrix.com>
Subject: Re: Xen + futexes
Date: Thu, 2 Jul 2015 12:48:51 +0200
Message-ID: <1435834131.25170.456.camel@citrix.com>
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To: Vitaly Chernooky <vitalii.chernookyi@globallogic.com>
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On Thu, 2015-07-02 at 12:48 +0300, Vitaly Chernooky wrote:
> Hi all!
>
Hi,
>=20
> I have theoretical question.
>
Great, I love theoretical stuff! :-P
>=20
> What do you think about porting futexes or binder to XEN?
>
Ouch... That's *too* theoretical! :-)

No, really, I know a bit about futexes [0], while I know nothing about
binder (I'll investigate).

Actually, we don't even have mutexes _within_ the hypervisor, so I
struggle a bit to figure out how it would be useful to offer a similar
support to whatever is userspace for us (i.e., what futexes do, as far
as I can recall).

So, that's why I was joking/saying about this being too much
theoretical: do you have a use case in mind where something like that
can help and be useful? If yes, I'd be interested in hearing about it.

Regards,
Dario

[0] http://www.akkadia.org/drepper/futex.pdf
--=20
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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