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

From: Paul Eggert <[email-masked]>
Date: Sat, 13 Nov 2021 15:12:46 -0800

As I vaguely recall, every system using this code has SIGIO nowadays. It 
sounds like we should assume SIGIO here, and simplify the code 
accordingly, so as to avoid confusion in the future.