bug#22364: 25.0.50; Emacs freezes when regenating tags

bug#22364: 25.0.50; Emacs freezes when regenating tags

[ReneFroger]

http://emacs.stackexchange.com/questions/19075/regenerate-tags-without-freezing-emacs-for-a-while


When I call the command `projectile-regenate-tags` while I'm in the middle of a
project, the project will be scanned by ctags and the tags are stored in the
TAGS file.

While all this action is progressing, Emacs is unreachable unitl the generation
of tags is completed. Others told me this is a bug of Emacs, not projectile, and
I need to report it here.  



In GNU Emacs 25.0.50.2 (x86_64-pc-linux-gnu, GTK+ Version 3.16.7)
 of 2015-11-02
Windowing system distributor 'The X.Org Foundation', version 11.0.11702000
System Description:	Ubuntu 15.10

Configured using:
 'configure --build=x86_64-linux-gnu --prefix=/usr
 '--includedir=${prefix}/include' '--mandir=${prefix}/share/man'
 '--infodir=${prefix}/share/info' --sysconfdir=/etc --localstatedir=/var
 --disable-silent-rules '--libdir=${prefix}/lib/x86_64-linux-gnu'
 '--libexecdir=${prefix}/lib/x86_64-linux-gnu' --disable-maintainer-mode
 --disable-dependency-tracking --prefix=/usr --sharedstatedir=/var/lib
 --program-suffix=-snapshot --with-x=yes --with-x-toolkit=gtk3 'CFLAGS=-g -O2
 -fstack-protector-strong -Wformat -Werror=format-security'
 CPPFLAGS=-D_FORTIFY_SOURCE=2 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS NOTIFY
LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB TOOLKIT_SCROLL_BARS
GTK3 X11

Important settings:
  value of $LC_MONETARY: nl_NL.UTF-8
  value of $LC_NUMERIC: nl_NL.UTF-8
  value of $LC_TIME: nl_NL.UTF-8
  value of $LANG: en_US.UTF-8
  value of $XMODIFIERS: 
  locale-coding-system: utf-8

Major mode: EShell

Minor modes in effect:
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Recent messages:
Indenting region...done
GNU Emacs 25.0.50.2 (x86_64-pc-linux-gnu, GTK+ Version 3.16.7) of 2015-11-02
Indenting region...done
C-h C-g is undefined
Type "q" in help window to delete it.
evil-line-move: Beginning of buffer
user-error: Can’t find j
copied to clipboard
funcall-interactively: End of buffer
evil-line-move: End of buffer
Quit [2 times]

Load-path shadows:
/home/ehart/.emacs.d/elpa/helm-20160105.338/helm-multi-match hides /home/ehart/.emacs.d/elpa/helm-core-20160105.327/helm-multi-match
/usr/share/emacs/site-lisp/dictionaries-common/flyspell hides /usr/share/emacs/25.0.50/lisp/textmodes/flyspell
/usr/share/emacs/site-lisp/dictionaries-common/ispell hides /usr/share/emacs/25.0.50/lisp/textmodes/ispell
/home/ehart/.emacs.d/elpa/seq-20151121.1017/seq hides /usr/share/emacs/25.0.50/lisp/emacs-lisp/seq

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config-projectile helm-projectile projectile-codesearch codesearch projectile
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xml url url-proxy url-privacy url-expand url-methods url-history url-cookie
url-domsuf url-util url-parse url-vars mailcap helm-utils compile helm-help
helm-types helm helm-source eieio-compat helm-multi-match helm-lib dired
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bug#22364: 25.0.50; Emacs freezes when regenating tags

[Dmitry Gutov]

On 01/13/2016 05:14 PM, ReneFroger wrote:

> While all this action is progressing, Emacs is unreachable unitl the generation
> of tags is completed. Others told me this is a bug of Emacs, not projectile, and
> I need to report it here.

"Others" is apparently Drew, because wasamasa told you to report this to 
Projectile.

Projectile uses call-process-shell-command, which runs the process 
synchronously. It could switch to using start-process-shell-command, or 
at least provide an option to do so, to run the tags regeneration 
asynchronously.

That would raise the question, however, of properly notifying the user 
when the process has finished.

Nothing to do here in Emacs, closing.

bug#22364: 25.0.50; Emacs freezes when regenating tags

[Eli Zaretskii]

> From: ReneFroger <ernstdehart@gmail.com>
> Date: Wed, 13 Jan 2016 15:14:55 +0100
> 
> http://emacs.stackexchange.com/questions/19075/regenerate-tags-without-freezing-emacs-for-a-while
> 
> 
> When I call the command `projectile-regenate-tags` while I'm in the middle of a
> project, the project will be scanned by ctags and the tags are stored in the
> TAGS file.
> 
> While all this action is progressing, Emacs is unreachable unitl the generation
> of tags is completed.

AFAIK, projectile is not part of Emacs, nor in ELPA.  So please report
this to the people who develop projectile.

> Others told me this is a bug of Emacs, not projectile, and I need to
> report it here.

Don't believe everything you are told on stackexchange.

Thanks.

bug#22364: 25.0.50; Emacs freezes when regenating tags

[Glenn Morris]

ReneFroger wrote:

> http://emacs.stackexchange.com/questions/19075/regenerate-tags-without-freezing-emacs-for-a-while
>
>
> When I call the command `projectile-regenate-tags` while I'm in the
> middle of a project, the project will be scanned by ctags and the tags
> are stored in the TAGS file.
>
> While all this action is progressing, Emacs is unreachable unitl the
> generation of tags is completed. Others told me this is a bug of
> Emacs, not projectile, and I need to report it here.

The others are incorrect.
Let me quote a more helpful reply someone made there:

    It's a bug for projectile to do this synchronously, not for Emacs to
    do what it's told to. There is no magical switch that makes every
    single operation in Emacs non-blocking, it's up to package authors
    to leverage its possibilities properly.