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Re: Using the GNU GMP Library for Bignums in Emacs

From: Richard Stallman
Subject: Re: Using the GNU GMP Library for Bignums in Emacs
Date: Sun, 22 Apr 2018 23:34:58 -0400

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  > We've changed how signals are processed in Emacs several years ago.
  > Nowadays, a signal handler just sets a flag, and the Lisp interpreter
  > tests that flag "when appropriate" (normally, as part of maybe_quit).

  > This change was done to avoid non-trivial processing inside signal
  > handlers.

Quiting always worked by setting a flag, tested by the QUIT macro.
However, as I implemented it, some constructs used to specify to quit
immediately straight from the signal handler.

I see that this feature has been deleted.  That is going to cause a
bad results.  There are quite a few places in the C code of Emacs
where execution can get stuck; that's why I added immediate quitting.
The problems I fixed that way have all come back.

What was the reason for this change?

I think we need to revert it, and fix whatever problem
in another way.

Dr Richard Stallman
President, Free Software Foundation (https://gnu.org, https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)
Skype: No way! See https://stallman.org/skype.html.

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