Message-ID: <55413158.5060808@gmail.com>
Date: Wed, 29 Apr 2015 15:30:32 -0400
From: Austin S Hemmelgarn <ahferroin7@gmail.com>
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To: Andy Lutomirski <luto@amacapital.net>, Harald Hoyer <harald@redhat.com>
CC: Arnd Bergmann <arnd@arndb.de>, Havoc Pennington <hp@pobox.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Jiri Kosina <jkosina@suse.cz>,
        Andrew Morton <akpm@linux-foundation.org>,
        Daniel Mack <daniel@zonque.org>,
        One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Lukasz Skalski <l.skalski@samsung.com>,
        "Theodore Ts'o" <tytso@mit.edu>, Tom Gundersen <teg@jklm.no>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        David Herrmann <dh.herrmann@gmail.com>,
        "Eric W. Biederman" <ebiederm@xmission.com>,
        John Stoffel <john@stoffel.org>, Djalal Harouni <tixxdz@opendz.org>
Subject: Re: [GIT PULL] kdbus for 4.1-rc1
References: <20150423163616.GA10874@kroah.com> <CALCETrWoCsXDWYPedwMDk1s=Bxtc2s+oMCLCok8jg8-RbEL4KQ@mail.gmail.com> <20150423171640.GA11227@kroah.com> <553A4A2F.5090406@samsung.com> <CA+55aFzotCVgjW4Yj+HMfgw77vZwtfn0WXA6=OdZfU5fyB4u7w@mail.gmail.com> <CALCETrW+erTbMBHnN5zv_noP38Gznm4E0U7qk+uxOvM+a=NvCg@mail.gmail.com> <CA+55aFxRa3mwL-17hUuUGpjCeGJXseGteuZdj8eiP5MMkGWO7A@mail.gmail.com> <CA+55aFxdguuO7CLKYYq_qM6S6FT2CicZ1E5D5xGE54OdJNQwew@mail.gmail.com> <CAEntwhEO3CZ4ub4dRWxWz6dPynsfXh=1kAsBWO2wjLKArH1Dyw@mail.gmail.com> <CAEntwhHEx+XCdOPdH7EdvzBRoNKkUFKTaH==iMo4-bi=F-CVkA@mail.gmail.com> <20150428171840.GB11351@thunk.org> <CAEntwhE-Pv3fRVgZV2EDro45W8XfUZ8fCbA0jaUEUh=OJYwPBw@mail.gmail.com> <21824.5086.446831.189915@quad.stoffel.home> <5540D2F9.2010704@redhat.com> <CALCETrV3r3XOyoCnFOq-_hSv1nwNyOUzA-wAep3_nxzFQ0mZ2A@mail.gmail.com>
In-Reply-To: <CALCETrV3r3XOyoCnFOq-_hSv1nwNyOUzA-wAep3_nxzFQ0mZ2A@mail.gmail.com>
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On 2015-04-29 14:54, Andy Lutomirski wrote:
> On Apr 29, 2015 5:48 AM, "Harald Hoyer" <harald@redhat.com> wrote:
>>
>>   * Being in the kernel closes a lot of races which can't be fixed wit=
h
>>     the current userspace solutions.  For example, with kdbus, there i=
s a
>>     way a client can disconnect from a bus, but do so only if no furth=
er
>>     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=20
if a message arrived for the client after the daemon told it it could=20
exit, but before it finished shutdown, in which case the message might=20
get lost.


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