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Re: UI input unresponsive on macOS

From: Alan Third
Subject: Re: UI input unresponsive on macOS
Date: Tue, 3 Jan 2017 17:49:00 +0000
User-agent: Mutt/1.7.1 (2016-10-04)

On Tue, Jan 03, 2017 at 08:59:43AM -0800, Bob Halley wrote:
> > Can you try the attached patch?
> It didn’t fix things, but I did find a way to reproduce the problem at will.
> If start emacs, and then you run
>     open -a /Applications/Emacs.app whatever_file_here

I didn’t even know you could do that. I wonder if I’ve accidentally
clobbered some notification or event somewhere. I’ll have to try and
work out how this works.

> For a file which isn’t open, then the UI becomes unresponsive to
> input. Typing C-G seems to unstick it eventually, but there can be
> very long delays (I timed one at 49 seconds) before it beeps and the
> UI becomes responsive. I’ve seen it spontaneously complete too,
> again after a long time (at least 30 seconds), but usually it does
> not complete.

I had some trouble with that sort of thing before. What was happening
then was that a time‐out in ns_select was being reached before it
would react. I had thought I’d fixed that particular problem for most
cases in the last patch, though.

> Sometimes when I “continue” in the debugger it unsticks whatever is
> stuck, though the file I was trying to open never opens.

One of the bugs I had with an earlier version of this code would go
away when I put a breakpoint on the relevant function. Debugging can
be hard. :)

Thanks for your help.

Alan Third

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