GNU bug report logs - #31671
26.1; edebug-defun doesn't step if functions run in a separate thread

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Package: emacs; Reported by: Raimon Grau <raimon@HIDDEN>; Keywords: confirmed; dated Thu, 31 May 2018 17:45:01 UTC; Maintainer for emacs is bug-gnu-emacs@HIDDEN.
Added tag(s) confirmed. Request was from Noam Postavsky <npostavs@HIDDEN> to control <at> debbugs.gnu.org. Full text available.

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From: Eli Zaretskii <eliz@HIDDEN>
To: raimon@HIDDEN
In-reply-to: <83r2lmbidf.fsf@HIDDEN> (message from Eli Zaretskii on Mon, 04
 Jun 2018 19:56:28 +0300)
Subject: Re: bug#31671: 26.1;
 edebug-defun doesn't step if functions run in a separate thread
References: <87muwfsp4i.fsf@HIDDEN> <83r2lmbidf.fsf@HIDDEN>
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> Date: Mon, 04 Jun 2018 19:56:28 +0300
> From: Eli Zaretskii <eliz@HIDDEN>
> Cc: 31671 <at> debbugs.gnu.org
> 
> The problem here is that Edebug enters recursive-editing (on the
> non-main thread which runs the function 'foo'), then waits for the
> user to press a key.  While it waits, it releases the global lock, and
> the main thread starts running.  So when you press a key, you are on a
> different thread, and 'throw' doesn't have a matching 'catch' (because
> that 'catch' is stored with the handlers of the thread which runs
> 'foo'.
> 
> Not yet sure how to deal with this.  Thoughts and ideas are welcome.

Any objections to the following band-aid?  (Of course, user-error does
nothing visible on non-main threads, and you have too invoke
thread-last-error to see the error message, but at least we don't
leave around a thread in limbo waiting forever for input that will
never come...)

--- src/thread.c~0	2018-01-28 06:56:25.000000000 +0200
+++ src/thread.c	2018-06-05 17:25:43.147566500 +0300
@@ -980,6 +980,23 @@ DEFUN ("thread-last-error", Fthread_last
   return last_thread_error;
 }
 
+DEFUN ("main-thread-p", Fmain_thread_p, Smain_thread_p, 0, 1, 0,
+       doc: /* Return non-nil if THREAD is the main thread.
+If THREAD is nil or omitted, it defaults to the current thread.  */)
+  (Lisp_Object thread)
+{
+  struct thread_state *tstate;
+
+  if (NILP (thread))
+    tstate = current_thread;
+  else
+    {
+      CHECK_THREAD (thread);
+      tstate = XTHREAD (thread);
+    }
+  return main_thread_p (tstate) ? Qt : Qnil;
+}
+
 
 
 bool
@@ -1073,6 +1090,7 @@ syms_of_threads (void)
       defsubr (&Scondition_mutex);
       defsubr (&Scondition_name);
       defsubr (&Sthread_last_error);
+      defsubr (&Smain_thread_p);
 
       staticpro (&last_thread_error);
       last_thread_error = Qnil;
--- lisp/emacs-lisp/edebug.el~0	2018-03-14 06:39:59.000000000 +0200
+++ lisp/emacs-lisp/edebug.el	2018-06-05 17:19:52.017355000 +0300
@@ -2425,6 +2425,8 @@
   (if inhibit-redisplay
       ;; Don't really try to enter edebug within an eval from redisplay.
       value
+    (or (main-thread-p)
+        (user-error "Debugging on non-main thread is not yet supported"))
     ;; Check breakpoints and pending input.
     ;; If edebug display should be updated, call edebug--display.
     ;; Return value.
--- lisp/emacs-lisp/debug.el~0	2018-01-03 13:08:56.000000000 +0200
+++ lisp/emacs-lisp/debug.el	2018-06-05 17:31:39.765134800 +0300
@@ -147,6 +147,8 @@
   (if inhibit-redisplay
       ;; Don't really try to enter debugger within an eval from redisplay.
       debugger-value
+    (or (main-thread-p)
+        (user-error "Debugging on non-main thread is not yet supported"))
     (unless noninteractive
       (message "Entering debugger..."))
     (let (debugger-value
--- doc/lispref/threads.texi~0	2018-01-03 13:08:46.000000000 +0200
+++ doc/lispref/threads.texi	2018-06-05 17:29:47.030735200 +0300
@@ -122,6 +122,12 @@
 Return the current thread.
 @end defun
 
+@defun main-thread-p &optional thread
+This function returns non-@code{nil} if @var{thread} is the main
+thread.  If @var{thread} is @code{nil} or omitted, it defaults to the
+current thread.
+@end defun
+
 @defun all-threads
 Return a list of all the live thread objects.  A new list is returned
 by each invocation.
--- etc/NEWS~	2018-03-14 06:39:58.000000000 +0200
+++ etc/NEWS	2018-06-05 17:37:13.301233500 +0300
@@ -361,6 +361,11 @@
 * Lisp Changes in Emacs 27.1
 
 +++
+** New primitive 'main-thread-p'.
+This can be used in code which needs to work differently when it runs
+in threads other than the main thread.
+
++++
 ** New function assoc-delete-all.
 
 ** 'print-quoted' now defaults to t, so if you want to see
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#31671; Package emacs. Full text available.

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From: Eli Zaretskii <eliz@HIDDEN>
To: Drew Adams <drew.adams@HIDDEN>
In-reply-to: <b6ac5457-5353-4a73-9835-2c131d08398f@default> (message from Drew
 Adams on Mon, 4 Jun 2018 10:23:58 -0700 (PDT))
Subject: Re: bug#31671: 26.1; edebug-defun doesn't step if functions run in a
 separate thread
References: <<87muwfsp4i.fsf@HIDDEN>> <<83r2lmbidf.fsf@HIDDEN>>
 <b6ac5457-5353-4a73-9835-2c131d08398f@default>
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> Date: Mon, 4 Jun 2018 10:23:58 -0700 (PDT)
> From: Drew Adams <drew.adams@HIDDEN>
> Cc: 31671 <at> debbugs.gnu.org
> 
> > The problem here is that Edebug enters recursive-editing (on the
> > non-main thread which runs the function 'foo'), then waits for the
> > user to press a key.  While it waits, it releases the global lock, and
> > the main thread starts running.  So when you press a key, you are on a
> > different thread, and 'throw' doesn't have a matching 'catch' (because
> > that 'catch' is stored with the handlers of the thread which runs
> > 'foo'.
> > 
> > Not yet sure how to deal with this.  Thoughts and ideas are welcome.
> 
> Not really following this thread, and 100% unknowledgable
> about Emacs threading.  But somewhat curious: Does the same
> problem exist for plain `debug' as for `edebug'?

Yes.  Modify the recipe like this, and you have the same problem with
'debug':

  emacs -Q
  Type:

    (defun foo ()
      (message "Hi"))

  Eval the function to define it.
  M-x debug-on-entry RET foo RET
  M-: (make-thread 'foo) RET

  Type 'd' in the backtrace that Emacs presents.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#31671; Package emacs. Full text available.

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From: Drew Adams <drew.adams@HIDDEN>
To: Eli Zaretskii <eliz@HIDDEN>, Raimon Grau <raimon@HIDDEN>
Subject: RE: bug#31671: 26.1; edebug-defun doesn't step if functions run in a
 separate thread
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> The problem here is that Edebug enters recursive-editing (on the
> non-main thread which runs the function 'foo'), then waits for the
> user to press a key.  While it waits, it releases the global lock, and
> the main thread starts running.  So when you press a key, you are on a
> different thread, and 'throw' doesn't have a matching 'catch' (because
> that 'catch' is stored with the handlers of the thread which runs
> 'foo'.
>=20
> Not yet sure how to deal with this.  Thoughts and ideas are welcome.

Not really following this thread, and 100% unknowledgable
about Emacs threading.  But somewhat curious: Does the same
problem exist for plain `debug' as for `edebug'?
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#31671; Package emacs. Full text available.

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Date: Mon, 04 Jun 2018 19:56:28 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
To: Raimon Grau <raimon@HIDDEN>
In-reply-to: <87muwfsp4i.fsf@HIDDEN> (message from Raimon Grau on Thu, 31
 May 2018 18:37:17 +0100)
Subject: Re: bug#31671: 26.1;
 edebug-defun doesn't step if functions run in a separate thread
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> From: Raimon Grau <raimon@HIDDEN>
> Date: Thu, 31 May 2018 18:37:17 +0100
> 
> Using edebug-defun to instrument a function and running that function in
> a separate thread using `make-thread' makes triggers the breakpoint but
> leaves the bufer in read-only-mode but the user can't interact with
> edebug in any way.
> 
> Steps to reproduce (ubuntu 16.04):
> - start emacs with emacs -Q  . 
> - in the *scratch* buffer, write:
> (defun foo ()
>   (message "hi"))
> 
> (make-thread 'foo)
> - edebug-defun function foo
> - c-x c-e the (make-thread 'foo) sexp
> - *scratch* buffer point moves to the beginning of function foo
> - press `n` and the minibuffers says: "No catch for tag: exit, nil". The
>   whole buffer is in read-only mode. modeline has
>   "(Lisp Interaction *Debugging* ElDoc)"

The problem here is that Edebug enters recursive-editing (on the
non-main thread which runs the function 'foo'), then waits for the
user to press a key.  While it waits, it releases the global lock, and
the main thread starts running.  So when you press a key, you are on a
different thread, and 'throw' doesn't have a matching 'catch' (because
that 'catch' is stored with the handlers of the thread which runs
'foo'.

Not yet sure how to deal with this.  Thoughts and ideas are welcome.
Information forwarded to bug-gnu-emacs@HIDDEN:
bug#31671; Package emacs. Full text available.

Message received at submit <at> debbugs.gnu.org:


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Subject: 26.1; edebug-defun doesn't step if functions run in a separate thread
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Using edebug-defun to instrument a function and running that function in
a separate thread using `make-thread' makes triggers the breakpoint but
leaves the bufer in read-only-mode but the user can't interact with
edebug in any way.

Steps to reproduce (ubuntu 16.04):
- start emacs with emacs -Q  . 
- in the *scratch* buffer, write:
(defun foo ()
  (message "hi"))

(make-thread 'foo)
- edebug-defun function foo
- c-x c-e the (make-thread 'foo) sexp
- *scratch* buffer point moves to the beginning of function foo
- press `n` and the minibuffers says: "No catch for tag: exit, nil". The
  whole buffer is in read-only mode. modeline has
  "(Lisp Interaction *Debugging* ElDoc)"

The "Recent messages" below correspond exactly to that sequence of
commands.


In GNU Emacs 26.1 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.18.9)
 of 2018-05-10 built on raikong
Repository revision: 1d9e66aea17787e03954f32c6cd7561c881bb444
Windowing system distributor 'The X.Org Foundation', version 11.0.11905000
System Description:	Ubuntu 16.04.4 LTS

Recent messages:
foo
Edebug: foo
foo
#<thread 0x1399d20>

edebug-set-mode: No catch for tag: exit, nil
Making completion list...
(#<thread 0xc11460> #<thread 0x1399d20>)
Making completion list... [2 times]
Edebug will stop after next eval.
edebug-bounce-point: Edebug is not active
command-execute: Buffer is read-only: #<buffer *scratch*>

Configured using:
 'configure --prefix=/home/rgrau/emacs-git
 PKG_CONFIG_PATH=/home/rgrau/.guix-profile/lib/pkgconfig'

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GSETTINGS NOTIFY
ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11 THREADS LCMS2

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

Major mode: Lisp Interaction

Minor modes in effect:
  edebug-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  buffer-read-only: t
  line-number-mode: t
  transient-mark-mode: t

Load-path shadows:
None found.

Features:
(shadow sort mail-extr emacsbug message rmc puny seq byte-opt gv
bytecomp byte-compile cconv dired dired-loaddefs format-spec rfc822 mml
mml-sec password-cache epa derived epg epg-config gnus-util rmail
rmail-loaddefs mm-decode mm-bodies mm-encode mail-parse rfc2231
mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums
mm-util mail-prsvr mail-utils edebug easymenu cl-loaddefs cl-lib
elec-pair time-date mule-util tooltip eldoc electric uniquify ediff-hook
vc-hooks lisp-float-type mwheel term/x-win x-win term/common-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list replace
newcomment text-mode elisp-mode lisp-mode prog-mode register page
menu-bar rfn-eshadow isearch timer select scroll-bar mouse jit-lock
font-lock syntax facemenu font-core term/tty-colors frame cl-generic
cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao
korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech
european ethiopic indian cyrillic chinese composite charscript charprop
case-table epa-hook jka-cmpr-hook help simple abbrev obarray minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote dbusbind inotify lcms2
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 97842 12105)
 (symbols 48 20713 1)
 (miscs 40 59 143)
 (strings 32 29196 1060)
 (string-bytes 1 768686)
 (vectors 16 14550)
 (vector-slots 8 496991 7738)
 (floats 8 53 323)
 (intervals 56 254 7)
 (buffers 992 12)
 (heap 1024 32030 1223))
Acknowledgement sent to Raimon Grau <raimon@HIDDEN>:
New bug report received and forwarded. Copy sent to bug-gnu-emacs@HIDDEN. Full text available.
Report forwarded to bug-gnu-emacs@HIDDEN:
bug#31671; Package emacs. Full text available.
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