Re: [PATCH draft 0/6] Remove the fhandler_base_overlapped class

[Ken Brown <kbrown at cornell dot edu>]

On 6/7/2019 2:31 PM, Achim Gratz wrote:
> Ken Brown writes:
>> I think I've found the problem.  I was mishandling signals that arrived during a
>> read.  But after I fix that, there's still one nagging issue involving timerfd
>> code.  I'll write to the main list with details.  I *think* it's a timerfd bug,
>> but it's puzzling that I only see it when testing my new pipe implementation.
> 
> Anything triggering a race or deadlock will depend on so many other
> things that it really is no surprise to see seemingly unrelated changes
> making the bug appear or disappear.  There are certainly races left in
> Cygwin, I see them from time to time in various Perl modules, just never
> reproducible enough to give anyone an idea of where to look.

That makes sense.

In the meantime, I've already discovered another problem, within an hour of 
posting my claim that everything was working fine: If I start emacs-X11 with 
cygserver running, I can't fork any subprocesses within emacs.  I get

0 [main] emacs 2689 dofork: child 2693 - died waiting for dll loading, errno 11

Back to the drawing board....  I've never looked at the cygserver code, but 
maybe it will turn out to be something easy.

Ken