* AW: Can't interrupt directory_files_internal run fromtimer-event-handler
@ 2005-08-08 11:27 klaus.berndl
2005-08-08 20:27 ` Eli Zaretskii
0 siblings, 1 reply; 5+ messages in thread
From: klaus.berndl @ 2005-08-08 11:27 UTC (permalink / raw)
Cc: kzeitler, emacs-devel
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>>> There's no need to run any program just to know if a directory is
>>> empty. Emacs has primitives which will tell that directly (e.g.,
>>> file-attributes) and do that faster.
>>>
>> How do you determine that from file-attributes? It is not obvious.
>A combination of file-attributes (looking at the number of links) and
>directory-files should do that, I think.
Hmm, maybe i oversee something here - but when you have to call
directory-files - where is the improvement compared to the problem of the OP?
`directory-files' IS the problem....
Ciao,
Klaus
>> You might try to do it from the number of hard links to the directory,
>> which will normally be 2 for an empty directory, since users normally
>> can't create alternate names for a directory. But isn't it possible
>> for root to create them?
>I'm not an expert on this, but I think it's impossible to create such
>alternate names, since GNU Find uses this fact to detect directories
>with no subdirectories.
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: AW: Can't interrupt directory_files_internal run fromtimer-event-handler
2005-08-08 11:27 AW: Can't interrupt directory_files_internal run fromtimer-event-handler klaus.berndl
@ 2005-08-08 20:27 ` Eli Zaretskii
0 siblings, 0 replies; 5+ messages in thread
From: Eli Zaretskii @ 2005-08-08 20:27 UTC (permalink / raw)
Cc: kzeitler, emacs-devel
> Date: Mon, 8 Aug 2005 13:27:46 +0200
> From: <klaus.berndl@sdm.de>
> Cc: <kzeitler@lucent.com>,
> <emacs-devel@gnu.org>
>
> >A combination of file-attributes (looking at the number of links) and
> >directory-files should do that, I think.
>
> Hmm, maybe i oversee something here - but when you have to call
> directory-files - where is the improvement compared to the problem of
> the OP?
It's an improvement because (1) directory-files is a direct interface
to system calls, and (2) it is more portable since it does not rely on
the existence of `ls', which is only standard on Posix platforms.
> `directory-files' IS the problem....
Well, I'm sorry if I missed something at the beginning of this thread,
but what problem in directory-files are you talking about?
^ permalink raw reply [flat|nested] 5+ messages in thread
* AW: Can't interrupt directory_files_internal run fromtimer-event-handler
@ 2005-08-10 9:35 klaus.berndl
2005-08-10 19:51 ` Richard M. Stallman
0 siblings, 1 reply; 5+ messages in thread
From: klaus.berndl @ 2005-08-10 9:35 UTC (permalink / raw)
Cc: kzeitler, emacs-devel
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>> ECB encapslates ist "stealthy" tasks in a loop like:
>> (while (and (not (input-pending-p))
>> ...
>> So IMHO C-g should work....
>Only if each iteration takes a (small) finite time. The OP's problem is
>that one of the iteration doesn't terminate.
i know - therefore my question concerning while-no-input!
In fact: ECB has some tasks which should be run really(!) stealthy, like
checking if a dir is empty, getting the VC-state of all files in a dir,
checking which files in a dir are read-only... in case of a remote host
an iteration of such a task (i.e. for one file of a dir) can be potentially
long lasting...
With the current available elisp-tools (macos, functions etc.) ECB can run
these tasks only pseudo-stealthy...therefore a way to make this really stealthy
would be very important for ECB so users are not blocked...
I have no preference how to achieve this (while-no-input, with-local-quit etc..),
but i would be great if i could achieve this goal at all!
>> AFAIK there is a new macro in CVS named `while-no-input' (there
>> was a discussion some time ago).... Could using this macro
>> solve problems like that posted from the OP??
>Could be. Another related new macro is with-local-quit (which uses no new
>internal feature and can thus be backported to other Emacsen).
see above - what would be the best way to enable real stealthiness?
Thanks a lot,
Klaus
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^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: AW: Can't interrupt directory_files_internal run fromtimer-event-handler
2005-08-10 9:35 klaus.berndl
@ 2005-08-10 19:51 ` Richard M. Stallman
0 siblings, 0 replies; 5+ messages in thread
From: Richard M. Stallman @ 2005-08-10 19:51 UTC (permalink / raw)
Cc: kzeitler, monnier, emacs-devel
In fact: ECB has some tasks which should be run really(!) stealthy, like
checking if a dir is empty, getting the VC-state of all files in a dir,
checking which files in a dir are read-only... in case of a remote host
The best way to do this and make sure it is stealthy is by running a
subprocess. The subprocess can run in parallel with Emacs.
^ permalink raw reply [flat|nested] 5+ messages in thread
* AW: Can't interrupt directory_files_internal run fromtimer-event-handler
@ 2005-08-12 8:00 klaus.berndl
0 siblings, 0 replies; 5+ messages in thread
From: klaus.berndl @ 2005-08-12 8:00 UTC (permalink / raw)
Cc: kzeitler, emacs-devel
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>> With the current available elisp-tools (macos, functions etc.) ECB can run
>> these tasks only pseudo-stealthy...therefore a way to make this really
>> stealthy would be very important for ECB so users are not blocked...
>> I have no preference how to achieve this (while-no-input, with-local-quit
>> etc..), but i would be great if i could achieve this goal at all!
>Do you expect us to figure out what's best for you?
no
>I'd say use while-no-input but you're in a better position to make this call.
the only thing i wanted is: An expert-estimation if while-no-input is a good
way - or with-local-quit - if i remember right you said that this could
easily being backported - maybe its not a really good idea to use a macro
which is only available in forthcoming Emacs 22 - IMHO also users of Emacs 21.X
should get a good solution...
is there a short example how to use this with-local-quit? This would help me
a lot - or a pointer where to find such an example..
Thanks for your help,
Klaus
Stefan
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2005-08-08 11:27 AW: Can't interrupt directory_files_internal run fromtimer-event-handler klaus.berndl
2005-08-08 20:27 ` Eli Zaretskii
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2005-08-10 9:35 klaus.berndl
2005-08-10 19:51 ` Richard M. Stallman
2005-08-12 8:00 klaus.berndl
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