bug#51820: 29.0.50; process_pending_signals is almost useless without SIGIO

[Lars Ingebrigtsen]

Ken Brown <kbrown@cornell.edu> writes:

> It's hard to know whether it's been a problem.  Maybe emacs would be
> more responsive to C-g on Cygwin if we removed the #ifdef from
> handle_async_input. My preference would be to try that (on master of
> course) and see if anything breaks.

Also see bug#50043 -- there's other stuff that also doesn't work very
well without SIGIO.

-- 
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   bloggy blog: http://lars.ingebrigtsen.no