Re: Disconnection
Re: Disconnection
- Subject: Re: Disconnection
- From: Eric Fielding <email@hidden>
- Date: Mon, 24 Nov 2003 09:43:50 +0000
The original poster didn't specify what kind of connection they had to
the Windows computer. It may well have been a file-sharing disk mount
(SMB) connection. I have had trouble with forgetting to disconnect from
a Samba (Windows-like but running on a Sun) server before taking my
Powerbook home. The Finder and nearly all other programs get very weird
and slow because they are waiting to finish some I/O. The system cannot
be shutdown even from the command line (without using the power button).
I found that the only solution was to drive back to the office and
connect to the network....
Cheers,
++Eric
Justin Walker wrote:
Yes. This is an issue in any OS. There are cases where a
process/task/app is in the middle of some "uninteruptable" operation,
and has to wait for the completion of some activity over which it has
no control (e.g., reading a block from a disk).
In this condition, it is not good to "kill" the process until things
are back to an interruptible state (otherwise, the system's
bookkeeping gets fouled up, and serious problems can result (e.g., a
lost buffer, in the above case).
Unix systems can deal with this by making the process in question
uninterruptible for the duration of the wait.
This can be detected with 'ps' (the 'man' page describes this, albeit
tersely).
I've had this happen on my dual G5 running Panther a few times now,
it doesn't seem to be any particular application, it just seems to
happen with one or two seemingly random processes sometimes. It
doesn't happen very often, but when it does I can't do a force quit
and no amount of sending kill -9 from the command line will end the
process (or processes) either, in fact I can't even restart the
system (it just hangs if I try). I have to manually power down :-(.
It makes me very thankful for the journalling filesystem.
Yup; since the process is uninterruptible, the system won't let you
interrupt it under any circumstances.
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