linux-kernel - Re: [GIT PULL] kdbus for 4.1-rc1

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Date:	Wed, 29 Apr 2015 15:30:32 -0400
From:	Austin S Hemmelgarn <ahferroin7@...il.com>
To:	Andy Lutomirski <luto@...capital.net>,
	Harald Hoyer <harald@...hat.com>
CC:	Arnd Bergmann <arnd@...db.de>, Havoc Pennington <hp@...ox.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Jiri Kosina <jkosina@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Daniel Mack <daniel@...que.org>,
	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Lukasz Skalski <l.skalski@...sung.com>,
	Theodore Ts'o <tytso@....edu>, Tom Gundersen <teg@...m.no>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	David Herrmann <dh.herrmann@...il.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	John Stoffel <john@...ffel.org>,
	Djalal Harouni <tixxdz@...ndz.org>
Subject: Re: [GIT PULL] kdbus for 4.1-rc1

On 2015-04-29 14:54, Andy Lutomirski wrote:
> On Apr 29, 2015 5:48 AM, "Harald Hoyer" <harald@...hat.com> wrote:
>>
>>   * Being in the kernel closes a lot of races which can't be fixed with
>>     the current userspace solutions.  For example, with kdbus, there is a
>>     way a client can disconnect from a bus, but do so only if no further
>>     messages present in its queue, which is crucial for implementing
>>     race-free "exit-on-idle" services
>
> This can be implemented in userspace.
>
> Client to dbus daemon: may I exit now?
> Dbus daemon to client: yes (and no more messages) or no
>
Depending on how this is implemented, there would be a potential issue 
if a message arrived for the client after the daemon told it it could 
exit, but before it finished shutdown, in which case the message might 
get lost.


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