From: Eli Zaretskii <eliz@gnu.org>
Cc: klaus.berndl@sdm.de, emacs-devel@gnu.org
Subject: Re: Problem with `while-no-input'
Date: Sat, 11 Mar 2006 19:41:32 +0200 [thread overview]
Message-ID: <uacbwvpyr.fsf@gnu.org> (raw)
In-Reply-To: <u7j712m6y.fsf@jasonrumney.net> (message from Jason Rumney on Sat, 11 Mar 2006 12:35:49 +0000)
> From: Jason Rumney <jasonr@gnu.org>
> Date: Sat, 11 Mar 2006 12:35:49 +0000
> Cc: emacs-devel@gnu.org, storm@cua.dk, klaus.berndl@sdm.de
>
> Richard Stallman <rms@gnu.org> writes:
>
> > Hmm, would it not better, to enable while-not-input also working with Windows? ;-)
> >
> > Yes, it would be better, but that may be very difficult. (I don't
> > know.) We should document it if we can't fix it.
>
> I think the relevant code is in keyboard.c in the POLL_FOR_INPUT
> conditional blocks. Currently this code handles detection of C-g
> according to the comments, I do not know why it manages to do that
> without also handling general detection of input.
Jason, I'm looking at keyboard.c, and I don't understand what you are
saying. Are you saying that POLL_FOR_INPUT code is used by Windows,
and that it should handle this case, but currently only handles C-g?
Or are you saying that the POLL_FOR_INPUT code detects both C-g and
any other sorts of input, but somehow, only on Windows, non-C-g input
goes undetected?
Anyway, I see in w32fns.c:post_character_message that C-g is handled
specially in this function. When we detect C-g, we signal the special
interrupt_handle. However, I'm not quite sure who and how sees that
this handle is signaled: sys_select isn't called while the body of
while-no-input runs in this case, since that body is pure Lisp code,
right? What am I missing?
I also see in the debugger that, when the while-no-input form runs,
w32_read_socket is not called. I think this explains why Emacs
doesn't see the input, and doesn't interrupt the form's body:
w32_read_socket is the only way to receive input on Windows, right?
I think we can arrange for _any_ input to interrupt a while-no-input
form, but this needs to be done from w32_wnd_proc (which is in another
thread, right?). Do you think this is a good approach?
next prev parent reply other threads:[~2006-03-11 17:41 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-03-10 7:38 Problem with `while-no-input' klaus.berndl
2006-03-11 0:08 ` Richard Stallman
2006-03-11 12:35 ` Jason Rumney
2006-03-11 15:29 ` Jason Rumney
2006-03-11 21:55 ` Eli Zaretskii
2006-03-11 22:47 ` Jason Rumney
2006-03-12 0:00 ` Jason Rumney
2006-03-11 17:41 ` Eli Zaretskii [this message]
2006-03-11 22:45 ` Jason Rumney
2006-03-11 23:46 ` Richard Stallman
-- strict thread matches above, loose matches on Subject: below --
2006-04-27 6:41 klaus.berndl
2006-04-27 21:26 ` Richard Stallman
2006-04-26 12:58 klaus.berndl
2006-04-26 12:10 klaus.berndl
2006-04-26 12:43 ` Lennart Borgman
2006-04-26 12:58 ` Jason Rumney
2006-04-26 12:52 ` Jason Rumney
2006-04-26 11:46 klaus.berndl
2006-04-26 11:59 ` Jason Rumney
2006-04-26 18:05 ` Jason Rumney
2006-04-26 9:42 klaus.berndl
2006-04-26 18:53 ` Richard Stallman
2006-04-25 9:35 klaus.berndl
2006-04-25 22:05 ` Richard Stallman
2006-04-26 11:19 ` Jason Rumney
2006-03-08 14:50 klaus.berndl
2006-03-08 13:05 LENNART BORGMAN
2006-03-08 13:50 ` martin rudalics
2006-03-08 14:01 ` martin rudalics
2006-03-11 16:37 ` Eli Zaretskii
2006-03-08 14:50 ` Jason Rumney
2006-03-08 15:00 ` Stefan Monnier
2006-03-08 11:34 klaus.berndl
2006-03-08 12:41 ` Kim F. Storm
2006-03-09 17:13 ` Richard Stallman
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