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From: Eli Zaretskii <eliz@gnu.org>
To: "Gerd Möllmann" <gerd.moellmann@gmail.com>
Cc: pipcet@protonmail.com, ofv@wanadoo.es, emacs-devel@gnu.org,
	eller.helmut@gmail.com, acorallo@gnu.org
Subject: Re: SIGPROF + SIGCHLD and igc
Date: Tue, 24 Dec 2024 14:54:19 +0200	[thread overview]
Message-ID: <86h66t2qdg.fsf@gnu.org> (raw)
In-Reply-To: <m2o711ehx2.fsf_-_@gmail.com> (message from Gerd Möllmann on Tue, 24 Dec 2024 07:03:53 +0100)

> From: Gerd Möllmann <gerd.moellmann@gmail.com>
> Cc: pipcet@protonmail.com,  ofv@wanadoo.es,  emacs-devel@gnu.org,
>   eller.helmut@gmail.com,  acorallo@gnu.org
> Date: Tue, 24 Dec 2024 07:03:53 +0100
> 
> (I've given this a new subject.)

Not a second too soon!

> This is about SIGCHLD, and I must say I find it a bit hard to tell if
> all other platforms do the same. There are simply too many #if's to
> consider in the signal handling code.
> 
> Anyway, what I see here: SIGCHLD doesn't do anything dangerous in the
> signal handler. Instead, the occurrence of SIGCHLD is added to a queue
> with enqueue_async_work and that's basically it.

Are we looking at the same code?  I was talking about
handle_child_signal, which is called thusly:

  static void
  deliver_child_signal (int sig)
  {
    deliver_process_signal (sig, handle_child_signal);
  }

What I see in handle_child_signal is not what you describe above.

> The work items in the queue are processed by process_pending_signals,
> outside of the signal handler. Very nice, that's how it should be :-).

I think you are looking at how SIGIO and SIGALRM are processed.

> (And maybe, just as an inspiration, one could use that construct for
> SIGPROF?)

Could one?  SIGPROF's handler should sample the "program counter", so
delaying the sample will sample it in a wrong place.  Right?



  parent reply	other threads:[~2024-12-24 12:54 UTC|newest]

Thread overview: 69+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-12-22 15:40 Some experience with the igc branch Óscar Fuentes
2024-12-22 17:18 ` Gerd Möllmann
2024-12-22 17:29 ` Gerd Möllmann
2024-12-22 17:41 ` Pip Cet via Emacs development discussions.
2024-12-22 17:56   ` Gerd Möllmann
2024-12-22 19:11   ` Óscar Fuentes
2024-12-23  0:05     ` Pip Cet via Emacs development discussions.
2024-12-23  1:00       ` Óscar Fuentes
2024-12-23  3:42       ` Gerd Möllmann
2024-12-23  6:27     ` Jean Louis
2024-12-22 20:29   ` Helmut Eller
2024-12-22 20:50   ` Gerd Möllmann
2024-12-22 22:26     ` Pip Cet via Emacs development discussions.
2024-12-23  3:23       ` Gerd Möllmann
     [not found]         ` <m234ieddeu.fsf_-_@gmail.com>
     [not found]           ` <87ttaueqp9.fsf@protonmail.com>
     [not found]             ` <m2frme921u.fsf@gmail.com>
     [not found]               ` <87ldw6ejkv.fsf@protonmail.com>
     [not found]                 ` <m2bjx2h8dh.fsf@gmail.com>
2024-12-23 14:45                   ` Make Signal handling patch platform-dependent? Pip Cet via Emacs development discussions.
2024-12-23 14:54                     ` Gerd Möllmann
2024-12-23 15:11                       ` Eli Zaretskii
2024-12-23 13:35       ` Some experience with the igc branch Eli Zaretskii
2024-12-23 14:03         ` Discussion with MPS people Gerd Möllmann
2024-12-23 14:04           ` Gerd Möllmann
2024-12-23 15:07         ` Some experience with the igc branch Pip Cet via Emacs development discussions.
2024-12-23 15:26           ` Gerd Möllmann
2024-12-23 16:03             ` Pip Cet via Emacs development discussions.
2024-12-23 16:44               ` Eli Zaretskii
2024-12-23 17:16                 ` Pip Cet via Emacs development discussions.
2024-12-23 18:35                   ` Eli Zaretskii
2024-12-23 18:48                     ` Gerd Möllmann
2024-12-23 19:25                       ` Eli Zaretskii
2024-12-23 20:30                     ` Benjamin Riefenstahl
2024-12-23 23:39                       ` Pip Cet via Emacs development discussions.
2024-12-24 12:14                         ` Eli Zaretskii
2024-12-24 13:18                           ` Pip Cet via Emacs development discussions.
2024-12-24 13:42                           ` Benjamin Riefenstahl
2024-12-24  3:37                       ` Eli Zaretskii
2024-12-24  8:48                         ` Benjamin Riefenstahl
2024-12-24 13:52                           ` Eli Zaretskii
2024-12-24 13:54                             ` Benjamin Riefenstahl
2024-12-23 17:44               ` Gerd Möllmann
2024-12-23 19:00                 ` Eli Zaretskii
2024-12-23 19:37                   ` Eli Zaretskii
2024-12-23 20:49                   ` Gerd Möllmann
2024-12-23 21:43                     ` Helmut Eller
2024-12-23 21:49                       ` Pip Cet via Emacs development discussions.
2024-12-23 21:58                         ` Helmut Eller
2024-12-23 23:20                           ` Pip Cet via Emacs development discussions.
2024-12-24  5:38                             ` Helmut Eller
2024-12-24  6:27                               ` Gerd Möllmann
2024-12-24 10:09                               ` Pip Cet via Emacs development discussions.
2024-12-24  4:05                       ` Gerd Möllmann
2024-12-24  8:50                         ` Gerd Möllmann
2024-12-24  6:03                     ` SIGPROF + SIGCHLD and igc Gerd Möllmann
2024-12-24  8:23                       ` Helmut Eller
2024-12-24  8:39                         ` Gerd Möllmann
2024-12-24 13:05                         ` Eli Zaretskii
2024-12-24 12:54                       ` Eli Zaretskii [this message]
2024-12-24 12:59                         ` Gerd Möllmann
2024-12-23 23:37                   ` Some experience with the igc branch Pip Cet via Emacs development discussions.
2024-12-24  4:03                     ` Gerd Möllmann
2024-12-24 10:25                       ` Pip Cet via Emacs development discussions.
2024-12-24 10:50                         ` Gerd Möllmann
2024-12-24 13:15                         ` Eli Zaretskii
2024-12-24 12:26                       ` Eli Zaretskii
2024-12-24 12:56                         ` Gerd Möllmann
2024-12-24 13:19                           ` Pip Cet via Emacs development discussions.
2024-12-24 13:38                             ` Gerd Möllmann
2024-12-24 13:46                           ` Eli Zaretskii
2024-12-24 14:12                             ` Gerd Möllmann
2024-12-24 14:40                               ` Eli Zaretskii
2024-12-24 12:11                     ` Eli Zaretskii

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