bug#12743: 24.2.50; run-python hangs

bug#12743: 24.2.50; run-python hangs

[Left Right]

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Please write in English if possible, as the Emacs maintainers
usually do not have translators for other languages.

Please describe exactly what actions triggered the bug, and
the precise symptoms of the bug.  If you can, give a recipe
starting from `emacs -Q':

Immediately after starting Emacs with `emacs -Q` I ran
M-x run-python
This enters an infinite loop. I can interrupt the infinite loop with
C-g. After loop was interrupted, I looked into *Messages* buffer.
This is its contents:

Sent python-shell-completion-setup-code
Sent python-ffap-setup-code
Sent python-eldoc-setup-code
Error during redisplay: (jit-lock-function 1) signaled (quit)

After the fucntion was interrupted, the *Python* buffer appeared.
The modeline in the buffer spells: (Inferior Python:run
Shell-Compile)
I'm not sure if that is how it should be. I experience similar issues
with JavaScript-2 mode when using commint buffer to M-x run-js
Some times Emacs would lock up and after interruping it with C-g it
would print a message connected to a problem with displaying a face.
Sorry, I can't provide more info at the moment, but if that is
related, will find a way to do it.

Best.

Oleg

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In GNU Emacs 24.2.50.1 (x86_64-unknown-linux-gnu, GTK+ Version 2.24.11)
 of 2012-10-14 on wvxvw-desktop
Bzr revision: 110539 rgm@gnu.org-20121014001707-nd6ld4b0oxhsyl2c
Windowing system distributor `Fedora Project', version 11.0.11203000
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  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix
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Minor modes in effect:
  tooltip-mode: t
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Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
Sent python-shell-completion-setup-code
Sent python-ffap-setup-code
Sent python-eldoc-setup-code
Error during redisplay: (jit-lock-function 1) signaled (quit)

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bug#12743: 24.2.50; run-python hangs

[Left Right]

Hello again,

I think I know what the problem is, but I don't know how to fix it:

(defun jit-lock-function (start)
  "Fontify current buffer starting at position START.
This function is added to `fontification-functions' when `jit-lock-mode'
is active."
  (when (and jit-lock-mode (not memory-full))
    (if (null jit-lock-defer-timer)
        ;; No deferral.
        (jit-lock-fontify-now start (+ start jit-lock-chunk-size))
      ;; Record the buffer for later fontification.
      (unless (memq (current-buffer) jit-lock-defer-buffers)
        (push (current-buffer) jit-lock-defer-buffers))
      ;; Mark the area as defer-fontified so that the redisplay engine
      ;; is happy and so that the idle timer can find the places to fontify.
      (with-buffer-prepared-for-jit-lock
       (put-text-property start
                          (next-single-property-change
                           start 'fontified nil
                           (min (point-max) (+ start jit-lock-chunk-size)))
                          'fontified 'defer)))))

There are 3 s-expressions inside (if ...), the third will never run,
but it probably has to. Maybe it should be (when ...) instead of (if
...)?

Best.

Oleg

bug#12743: 24.2.50; run-python hangs

[Andreas Schwab]

Left Right <olegsivokon@gmail.com> writes:

> There are 3 s-expressions inside (if ...), the third will never run,
> but it probably has to. Maybe it should be (when ...) instead of (if
> ...)?

(if COND THEN ELSE...)

If COND yields non-nil, do THEN, else do ELSE...
Returns the value of THEN or the value of the last of the ELSE's.
THEN must be one expression, but ELSE... can be zero or more expressions.
                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

bug#12743: 24.2.50; run-python hangs

[Left Right]

OK, I admit, I wasn't clear, I didn't count the first one, so 4
s-expressions, not 3.

Best.

Oleg

bug#12743: 24.2.50; run-python hangs

[Left Right]

Ohhh... I think I know what's the reason:

with-buffer-prepared-for-jit-lock'
<-------------------------------------- note the quote! the name of
the macro doesn't have the quote in it, so instead of expanding the
macro, it thinks it is an undefined function. Doesn't it?

Best.

Oleg

bug#12743: 24.2.50; run-python hangs

[Left Right]

Sorry for the noise. That was some artefact left after me trying to debug.

Best.

Oleg

bug#12743: 24.2.50; run-python hangs

[Eli Zaretskii]

> Date: Sat, 27 Oct 2012 17:47:17 +0200
> From: Left Right <olegsivokon@gmail.com>
> 
> Immediately after starting Emacs with `emacs -Q` I ran
> M-x run-python
> This enters an infinite loop. I can interrupt the infinite loop with
> C-g. After loop was interrupted, I looked into *Messages* buffer.
> This is its contents:
> 
> Sent python-shell-completion-setup-code
> Sent python-ffap-setup-code
> Sent python-eldoc-setup-code
> Error during redisplay: (jit-lock-function 1) signaled (quit)

This is a duplicate of bug #12645.

bug#12743: 24.2.50; run-python hangs

[Left Right]

Oops, sorry, had to search it before.

Best.

Oleg