* lock mechanism like in desktop.el (was: accidentally started gnus)
[not found] ` <871vmthodp.fsf@newton.gmurray.org.uk>
@ 2009-08-30 9:01 ` Reiner Steib
2009-08-30 19:58 ` lock mechanism like in desktop.el Stefan Monnier
0 siblings, 1 reply; 5+ messages in thread
From: Reiner Steib @ 2009-08-30 9:01 UTC (permalink / raw)
To: ding, emacs-devel
[ From the Gnus list, adding emacs-devel. ]
On Sun, Aug 30 2009, Graham Murray wrote:
> Tim Landscheidt <tim@tim-landscheidt.de> writes:
[ citation added ... ]
>> Dan Christensen <jdc@uwo.ca> wrote:
>>> It's amazing how often this has saved me from having two copies of Gnus
>>> running!
>>>
>>> (add-hook 'gnus-before-startup-hook 'jdc-gnus-lock)
>>>
>>> (defun jdc-gnus-lock ()
>>> (or (equal 0 (shell-command "lockfile -r0 ~/Gnus/lock"))
>>> (y-or-n-p "Lockfile exists. Steal lock? ")
>>> (progn (kill-buffer "*Group*")
>>> (error "Unable to lock ~/Gnus/lock"))))
>>>
>>> (add-hook 'gnus-after-exiting-gnus-hook 'jdc-gnus-unlock)
>>>
>>> (defun jdc-gnus-unlock ()
>>> (shell-command "rm -f ~/Gnus/lock"))
>> That sounds rather interesting. Any chance this could be in-
>> tegrated into the main source?
desktop.el has a lock mechanism that is independent of external
programs. I'd prefer such a solution. Maybe the lock mechanism in
desktop.el could be made more generic (and moved from desktop.el to
simple.el/files.el?) so that other packages could use it without
duplicating the code (and loading desktop.el).
> Or change it so that instead of failing if gnus is already running it
> automatically runs 'gnus-slave' instead.
Prompting could offer this as well.
Bye, Reiner.
--
,,,
(o o)
---ooO-(_)-Ooo--- | PGP key available | http://rsteib.home.pages.de/
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: lock mechanism like in desktop.el
2009-08-30 9:01 ` lock mechanism like in desktop.el (was: accidentally started gnus) Reiner Steib
@ 2009-08-30 19:58 ` Stefan Monnier
2009-08-30 20:13 ` Juanma Barranquero
0 siblings, 1 reply; 5+ messages in thread
From: Stefan Monnier @ 2009-08-30 19:58 UTC (permalink / raw)
To: ding; +Cc: emacs-devel
> desktop.el has a lock mechanism that is independent of external
> programs. I'd prefer such a solution. Maybe the lock mechanism in
> desktop.el could be made more generic (and moved from desktop.el to
> simple.el/files.el?) so that other packages could use it without
> duplicating the code (and loading desktop.el).
We already have such functionality (lock-buffer, unlock-buffer,
file-locked-p), or am I missing something?
Stefan
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: lock mechanism like in desktop.el
2009-08-30 19:58 ` lock mechanism like in desktop.el Stefan Monnier
@ 2009-08-30 20:13 ` Juanma Barranquero
2009-08-31 0:38 ` Stefan Monnier
0 siblings, 1 reply; 5+ messages in thread
From: Juanma Barranquero @ 2009-08-30 20:13 UTC (permalink / raw)
To: Stefan Monnier; +Cc: emacs-devel
On Sun, Aug 30, 2009 at 21:58, Stefan Monnier<monnier@iro.umontreal.ca> wrote:
> We already have such functionality (lock-buffer, unlock-buffer,
> file-locked-p), or am I missing something?
They are unimplemented (and aliased to `ignore') on Windows.
Juanma
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: lock mechanism like in desktop.el
2009-08-30 20:13 ` Juanma Barranquero
@ 2009-08-31 0:38 ` Stefan Monnier
2009-08-31 0:46 ` Juanma Barranquero
0 siblings, 1 reply; 5+ messages in thread
From: Stefan Monnier @ 2009-08-31 0:38 UTC (permalink / raw)
To: Juanma Barranquero; +Cc: emacs-devel
>> We already have such functionality (lock-buffer, unlock-buffer,
>> file-locked-p), or am I missing something?
> They are unimplemented (and aliased to `ignore') on Windows.
Then the answer should be to implement it for w32 rather than to devise
a new scheme.
Stefan
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: lock mechanism like in desktop.el
2009-08-31 0:38 ` Stefan Monnier
@ 2009-08-31 0:46 ` Juanma Barranquero
0 siblings, 0 replies; 5+ messages in thread
From: Juanma Barranquero @ 2009-08-31 0:46 UTC (permalink / raw)
To: Stefan Monnier; +Cc: emacs-devel
On Mon, Aug 31, 2009 at 02:38, Stefan Monnier<monnier@iro.umontreal.ca> wrote:
> Then the answer should be to implement it for w32 rather than to devise
> a new scheme.
FWIW, I agree, though it is non-trivial because of different semantics
(the issue has been discussed a few times, IIRC).
But certainly reusing the desktop.el mechanism seems hackish.
Juanma
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2009-08-31 0:46 UTC | newest]
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[not found] ` <871vmthodp.fsf@newton.gmurray.org.uk>
2009-08-30 9:01 ` lock mechanism like in desktop.el (was: accidentally started gnus) Reiner Steib
2009-08-30 19:58 ` lock mechanism like in desktop.el Stefan Monnier
2009-08-30 20:13 ` Juanma Barranquero
2009-08-31 0:38 ` Stefan Monnier
2009-08-31 0:46 ` Juanma Barranquero
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