[arch-general] Upgrading while using a package (WAS: Re: pacman -Syu -- then tons of kio and kbuildsycoca warnings. Bug or coincidence?)

[diederick]

On Thu, 14 Oct 2010 11:37:43 +0200, diederick
<diederick at diederickdevries.net> wrote:
> On Thu, 14 Oct 2010 09:09:27 +0200, Stefan Husmann
> <stefan-husmann at t-online.de> wrote:
>> Am 14.10.2010 08:40, schrieb diederick:
>>> On 10/13/2010 11:03 PM, David Rosenstrauch wrote:
>>>
>>>> On 10/09/2010 12:57 AM, David C. Rankin wrote:
>>>>> Guys, just updated and got a slew of warning dumped back to konsole:
>>>
>>>> Nothing strange to me at all:  you're upgrading qt while you're in KDE
>>>> (which uses qt).  It's never a good idea to upgrade a package while it's
>>>> being used.  If you're upgrading a daemon, shut down the daemon first;
>>>> if you're upgrading qt, exit KDE first; if you're upgrading the kernel,
>>>> udev, etc., drop to single user mode first.
>>>
>>> I didn't know that, nor did I read that somewhere on the wiki. Why is
>>> this? Aren't programs copied to memory (i.e. loaded) before being used?
>>> In that case, isn't the upgraded version left alone until it is loaded
>>> the next time the program is started? Where can I find more on this?
>>>
>>> Thanks,
>>> Diederick
>>>
>>> --
>>> http://www.diederickdevries.net/
>>>
>>>
>>
>> Hello,
>>
>> in general you are right, but you never know. Programs are doing something.
>> Some may reload data files even or program code at runtime.
> 
> Right. In your earlier post, you specifically mention the kernel. Would
> you say that it is safe to install a new kernel in multi user mode if I
> reboot right after installation, while not using modprobe et al. between
> the installation and the reboot? And if not, why is single user mode
> safer?
> 
> Thanks for your quick response,
> Diederick

Oops, that should have been: "In the earlier post, the kernel was
mentioned specifically..." Sorry for that.

Diederick
-- 
http://www.diederickdevries.net/