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From: Gilles Chanteperdrix <gilles.chanteperdrix@xenomai.org>
To: Jan Kiszka <jan.kiszka@domain.hid>
Cc: Alexis Berlemont <berlemont.hauw@domain.hid>,
	xenomai-core <xenomai@xenomai.org>
Subject: Re: [Xenomai-core] [Xenomai-help] Analogy cmd_write example explanation
Date: Fri, 02 Apr 2010 12:39:26 +0200	[thread overview]
Message-ID: <4BB5C95E.9060502@domain.hid> (raw)
In-Reply-To: <4BB5348B.2070805@domain.hid>

Redirecting to xenomai core.

Jan Kiszka wrote:
> Gilles Chanteperdrix wrote:
>> Because of __xn_exec_current, people have broken drivers, and user-space
>> applications using T_PRIMARY as a broken way to workaround these broken
>> drivers, and by maintaining compatibility, we let them keep their broken
>> drivers and applications, by changing to the more natural
>> __xn_exec_conforming and removing T_PRIMARY, we ask them to fix their
>> drivers and applications.
> 
> Right goal, wrong approach for the reason I pointed out to Philippe:
> 
> We cannot map all kinds of driver requirements on a single
> __xn_exec_current in the RTDM middle layer.

What requirement can we not handle? It looks to me like with
__xn_exec_conforming, we can handle any requirement.

The only problem being the "double context switch" issue. But as
Philippe said, a sane application is calling such ioctls from non
critical code, so this is in fact a non-issue.

-- 
					    Gilles.


  reply	other threads:[~2010-04-02 10:39 UTC|newest]

Thread overview: 46+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-03-10 15:26 [Xenomai-help] Analogy cmd_write example explanation Daniele Nicolodi
2010-03-12 23:40 ` Alexis Berlemont
2010-03-13  9:28   ` Philippe Gerum
2010-03-13 16:13     ` Alexis Berlemont
2010-03-13 16:33       ` Philippe Gerum
2010-03-13 23:34         ` Alexis Berlemont
2010-03-14 16:34           ` Philippe Gerum
2010-03-15  7:50             ` Jan Kiszka
2010-03-15 23:30               ` Alexis Berlemont
2010-03-16  8:59                 ` Jan Kiszka
2010-03-18 20:35                 ` Philippe Gerum
2010-03-18 21:14                   ` Alexis Berlemont
2010-03-18 21:39                     ` Philippe Gerum
2010-04-01 19:47             ` Gilles Chanteperdrix
2010-04-01 21:13               ` Jan Kiszka
2010-04-01 21:22                 ` Philippe Gerum
2010-04-01 21:26                   ` Jan Kiszka
2010-04-01 21:31                     ` Philippe Gerum
2010-04-01 21:36                       ` Jan Kiszka
2010-04-01 21:48                         ` Philippe Gerum
2010-04-01 21:54                           ` Jan Kiszka
2010-04-01 22:00                             ` Philippe Gerum
2010-04-01 22:07                               ` Jan Kiszka
2010-04-01 22:53                                 ` Gilles Chanteperdrix
2010-04-01 22:58                                   ` Jan Kiszka
2010-04-01 23:08                                     ` Gilles Chanteperdrix
2010-04-02  0:04                                       ` Jan Kiszka
2010-04-02 10:39                                         ` Gilles Chanteperdrix [this message]
2010-04-02 11:11                                           ` [Xenomai-core] " Jan Kiszka
2010-04-02 11:14                                             ` Gilles Chanteperdrix
2010-04-02 11:28                                               ` Jan Kiszka
2010-04-13 20:41                                                 ` Philippe Gerum
2010-04-13 23:05                                                   ` Jan Kiszka
2010-04-14  7:22                                                     ` Philippe Gerum
2010-04-14  7:37                                                       ` Jan Kiszka
2010-04-14  7:51                                                         ` Jan Kiszka
2010-04-14  9:04                                                         ` Philippe Gerum
2010-04-14 17:13                                                           ` Gilles Chanteperdrix
2010-04-14 19:35                                                           ` Jan Kiszka
2010-04-14  8:24                                                   ` Gilles Chanteperdrix
2010-04-01 21:24               ` Philippe Gerum
2010-04-01 21:39                 ` Jan Kiszka
2010-04-01 21:59                   ` Philippe Gerum
2010-04-01 22:12                     ` Jan Kiszka
2010-04-01 21:50               ` Jan Kiszka
2010-04-01 21:54                 ` Gilles Chanteperdrix

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