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Re: data structures for use in signal handlers

From: Ben Pfaff
Subject: Re: data structures for use in signal handlers
Date: Tue, 9 Feb 2021 18:23:27 -0800

On Tue, Feb 9, 2021 at 6:07 PM Bruno Haible <bruno@clisp.org> wrote:
> Maybe I didn't describe accurately the situation I am asking for.
> I'm not attempting to transform a program to an event-based engine.
> I'm looking to let signal handlers (SIGTERM, SIGSEGV, SIGWINCH, etc.)
> read and traverse data structures that the main program has prepared
> (and that contain information about files to delete, memory areas,
> window lines to redraw etc.).

This is a situation that I've always worked hard to avoid. So little can
be safely done in a signal handler that it's worthwhile to try not to do
more than the minimum possible. Have you already concluded that
you must do significant work in a signal handler? I would not want to
try to, say, redraw lines in a window in a signal handler, because the
functions that I would need to call to do that would not be prepared
to run inside such a handler: I don't think ncurses or GTK+, for
example, would be happy at all about it.

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