Re: [BUG] cache file conflict? [9.7-pre (release_9.6.29-1441-gaa71fa @ /home/minshall/.emacs.d/straight/build/org/)]

[Ihor Radchenko]

Greg Minshall <minshall@umich.edu> writes:

> i run various Emacs instances, in each of which i run org.  i frequently
> get these messages (followed by errors when i reply 'q'):
> ----
> ...rg-persist/gc-lock.eld locked by minshall@arch... (pid 546721): (s, q, p, 
> ?)? 
> Error running timer ‘org-persist--refresh-gc-lock’: (file-locked 
> "/home/minshall/.cache/org-persist/gc-lock.eld" "minshall@archlinux (pid 
> 546721)")
> ----
>
> since i don't see a PID in the lock file name (i assume it is), i wonder
> if the code occasionally has this problem when more than one instance
> attempts to acquire this lock at a time?

In theory, the odds should be quite slim, unless you open that file
manually. Anyway...

Does the attached patch fix the problem for you?

>From 7f208e8802ed10017cce094114d395698523beec Mon Sep 17 00:00:00 2001
Message-ID: 
<7f208e8802ed10017cce094114d395698523beec.1715945418.git.yantar92@posteo.net>
From: Ihor Radchenko <yantar92@posteo.net>
Date: Fri, 17 May 2024 14:28:48 +0300
Subject: [PATCH] lisp/org-persist.el: Ignore lock files when writing cache

* lisp/org-persist.el (org-persist--write-elisp-file): Unlock file
before writing cache.

Reported-by: Greg Minshall <minshall@umich.edu>
Link: https://orgmode.org/list/574109.1715751441@archlinux
---
 lisp/org-persist.el | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/lisp/org-persist.el b/lisp/org-persist.el
index 0df345536..a8fc77c95 100644
--- a/lisp/org-persist.el
+++ b/lisp/org-persist.el
@@ -481,7 +481,10 @@ (defun org-persist--write-elisp-file (file data &optional 
no-circular pp)
       (if pp
           (let ((pp-use-max-width nil)) ; Emacs bug#58687
             (pp data (current-buffer)))
-        (prin1 data (current-buffer))))
+        (prin1 data (current-buffer)))
+      ;; Force writing even when the file happens to be opened by
+      ;; another Emacs process.
+      (unlock-buffer))
     (org-persist--display-time
      (- (float-time) start-time)
      "Writing to %S" file)))
-- 
2.45.1

-- 
Ihor Radchenko // yantar92,
Org mode contributor,
Learn more about Org mode at <https://orgmode.org/>.
Support Org development at <https://liberapay.com/org-mode>,
or support my work at <https://liberapay.com/yantar92>