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Re: Avoid asking to user for lock (ask-user-about-lock)
From: |
David Capello |
Subject: |
Re: Avoid asking to user for lock (ask-user-about-lock) |
Date: |
Thu, 24 Sep 2015 17:42:13 -0300 |
> > The problem is here:
> > https://github.com/dacap/keyfreq/blob/master/keyfreq.el#L427
>
> I think rather than override ask-user-about-lock you want to use the
> MUSTBENEW argument:
>
> (write-region (number-to-string (emacs-pid)) nil
> keyfreq-file-lock nil 'nomessage nil nil 'excl)
I think there is one extra nil, so I've used
(write-region (number-to-string (emacs-pid)) nil
keyfreq-file-lock nil 'nomessage nil 'excl)
And it seems to work, but I still getting some messages like:
.../.emacs.keyfreq.lock locked by david@pc (pid 9076): (s, q, p, ?)?
in the minibuf.
PS: Please CC me because I'm not subscribed to the list.
- David
On Thu, Sep 24, 2015 at 9:39 AM, David Capello <davidcapello@gmail.com>
wrote:
> Hi there,
>
> I've a package (keyfreq) that tries to add data to a file each X seconds.
> To do this it has to create a lock file, write the file, and release/delete
> the lock. If two instances of Emacs are running, both instances will try
> to write in the file at certain point. And here is where I'm having
> troubles
> (this was not a problem in Emacs 24.3, but now it is on 24.5).
>
> The problem is here:
> https://github.com/dacap/keyfreq/blob/master/keyfreq.el#L427
>
> I'm trying to redefine ask-user-about-lock temporarily so it doesn't
> ask to overwrite the .lock file if it already exists (if the lock already
> exist, we just "do nothing"/"wait next timeout", because the file is
> locked).
> Anyway it looks that sometimes, this redefinition doesn't work correctly.
>
> I would like to know if there is a way/common pattern to handle
> this kind of situations where two or more instances of Emacs are trying
> to add data to a file, and if they cannot get the lock, they just do
> nothing and can try it later.
>
> - David
>