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To: Ken Brown <kbrown AT cornell DOT edu>
Subject: Re: Another pipe-related problem?
References: <f5br1bqaj11 DOT fsf AT ecclerig DOT inf DOT ed DOT ac DOT uk>
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Date: Wed, 10 Nov 2021 17:23:21 +0000
In-Reply-To: <4b937b32-e348-19d2-2406-c55fa12e20a3@cornell.edu> (Ken Brown via
 Cygwin's message of "Wed\, 10 Nov 2021 09\:47\:31 -0500")
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From: "Henry S. Thompson via Cygwin" <cygwin AT cygwin DOT com>
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Ken Brown via Cygwin writes:

> On 11/9/2021 9:53 PM, Ken Brown via Cygwin wrote:
>> Back to the drawing board.
>
> It finally occurred to me to stop looking for a bug in
> fhandler_pipe::raw_read and instead see if something is in fact
> repeatedly writing to the pipe, so that drain_signal_event_pipe
> never finishes.  Putting a breakpoint at fhandler_pipe::raw_write, I
> found that this is in fact the case.  While the main thread is
> repeatedly reading from the pipe, a second thread is repeatedly
> writing to it.  Here's the backtrace of that thread:

Argh.  Thanks for the hard labour on this.  This is not a part of the
XEmacs code I have any experience of.  Is there any clue you can give
about how things changed in all the September commits to
fhandler_pipe.cc that might have exposed the XEmacs bug?

ht
-- 
       Henry S. Thompson, School of Informatics, University of Edinburgh
      10 Crichton Street, Edinburgh EH8 9AB, SCOTLAND -- (44) 131 650-4440
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