Re: Run function in background.

[Oleksandr Gavenko]

On 01.06.2011 13:19, Oleksandr Gavenko wrote:
> I need use auto update for GNU Global:
>
> $ global -u
>
> There described how this done:
>
> http://www.emacswiki.org/emacs/GnuGlobal
>
> But this:
>
> (defun gtags-root-dir ()
> "Returns GTAGS root directory or nil if doesn't exist."
> (with-temp-buffer
> (if (zerop (call-process "global" nil t nil "-pr"))
> (buffer-substring (point-min) (1- (point-max)))
> nil)))
>
> (defun gtags-update ()
> "Make GTAGS incremental update"
> (call-process "global" nil nil nil "-u"))
>
> (defun gtags-update-hook ()
> (when (gtags-root-dir)
> (gtags-update)))
>
> (add-hook 'after-save-hook #'gtags-update-hook)
>
> cause freezing Emacs for about 2-3 sec. How run this in background
> so I can still complete Emacs editing?
>
> Write sh script and start-process-shell-command for asynchronous job?
I write:

(defun gtags-update ()
  (start-process-shell-command "/bin/sh" nil "if global -pr; then 
global -u; fi")
  )

(add-hook 'after-save-hook #'gtags-update)
; (remove-hook 'after-save-hook #'gtags-update)

Seems this help but how in general case when I need run elisp code
in background (synchronization issue is not essential).