From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Jan Kiszka <jan.kiszka@domain.hid>
Cc: xenomai-core <xenomai@xenomai.org>
Subject: Re: [Xenomai-core] xnregistry_fetch & friends
Date: Tue, 26 Aug 2008 14:49:02 +0200 [thread overview]
Message-ID: <48B3FBBE.4050204@domain.hid> (raw)
In-Reply-To: <48B3C443.9000704@domain.hid>
Jan Kiszka wrote:
> BTW, I'm also preparing a patch to overcome hash chain registrations for
> anonymous (handle-only) objects as I need more of them (one for each
> thread) for fast mutexes - to avoid fiddling with kernel pointers in
> userland.
Ok. You will have a problem mangling a registry handle with the claimed
bit. Or maybe we can assume that the bit 31 is not used or something ?
And by the way, I had an idea of removing the duplication of the owner
field between an xnsynch and a mutex object, this would allow saving a
syscall when a situation of mutex stealing happened. Using a handle
would prevent this. But I am not so sure it is a good idea now (namely
because it would move some compare-and-swap the owner logic to the
xnsynch API).
--
Gilles.
next prev parent reply other threads:[~2008-08-26 12:49 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-08-25 20:19 [Xenomai-core] xnregistry_fetch & friends Jan Kiszka
2008-08-25 22:11 ` Philippe Gerum
2008-08-25 22:58 ` Jan Kiszka
2008-08-26 8:06 ` Philippe Gerum
2008-08-26 8:27 ` Jan Kiszka
2008-08-26 8:41 ` Philippe Gerum
2008-08-26 8:52 ` Jan Kiszka
2008-08-26 9:09 ` Philippe Gerum
2008-08-26 12:49 ` Gilles Chanteperdrix [this message]
2008-08-26 13:08 ` Jan Kiszka
2008-08-26 13:13 ` Gilles Chanteperdrix
2008-08-26 13:18 ` Gilles Chanteperdrix
2008-08-26 13:32 ` Jan Kiszka
2008-08-26 13:38 ` Gilles Chanteperdrix
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