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Re: delete-process bug
From: |
David Kastrup |
Subject: |
Re: delete-process bug |
Date: |
Thu, 25 May 2006 17:26:09 +0200 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.0.50 (gnu/linux) |
address@hidden (Michaël Cadilhac) writes:
> Stefan Monnier <address@hidden> writes:
>
>>> This is not really due to my patch. However, it shows a real race
>>> condition in process management of Emacs:
>> [...]
>>> After an hour of debugging, I can propose a small change that fixes
>>> this bug and lets no room for any other race condition of that kind,
>>> AFAICT.
>> [...]
>>> + * process.c (Fdelete_process): Wait for process termination to
>>> + avoid `sigchld_handler' to consider the process to be synchronous.
>>
>> I don't think it's a good idea. The process might not die in response to
>> delete-process, so we would end up waiting "indefinitely".
>
> Well, I copied the behavior of call_process, and tried to minimize
> the patch. However, I'm interested in knowing when a process
> doesn't answer a SIGKILL? I thought it was a non-ignorable signal.
That merely means that the process will never run again. It puts it
into "zombie" state. It will not get removed until the scheduler gets
around to start the cleanup, and then the cleanup still has to finish
(all files and sockets have to be closed). When devices are stuck,
this can take arbitrarily long.
--
David Kastrup, Kriemhildstr. 15, 44793 Bochum
- Re: Ispell loads dict twice., Michaël Cadilhac, 2006/05/23
- Re: Ispell loads dict twice., Agustin Martin, 2006/05/24
- delete-process bug (was: Ispell loads dict twice.), Michaël Cadilhac, 2006/05/25
- Re: delete-process bug (was: Ispell loads dict twice.), Agustin Martin, 2006/05/25
- Re: delete-process bug, Stefan Monnier, 2006/05/25
- Re: delete-process bug, David Kastrup, 2006/05/25
- Re: delete-process bug, Michaël Cadilhac, 2006/05/25
- Re: delete-process bug,
David Kastrup <=
- Re: delete-process bug, Stefan Monnier, 2006/05/25
- Re: delete-process bug, Kim F. Storm, 2006/05/25
- Re: delete-process bug, Richard Stallman, 2006/05/26
- Re: delete-process bug, Stefan Monnier, 2006/05/26
- Re: delete-process bug, Richard Stallman, 2006/05/25
- Re: delete-process bug, Michaël Cadilhac, 2006/05/26
- Re: delete-process bug, Richard Stallman, 2006/05/26
- Re: delete-process bug, Stefan Monnier, 2006/05/26
- Re: delete-process bug, Michael Mauger, 2006/05/26
- Re: delete-process bug, Michaël Cadilhac, 2006/05/27