Re: Some experience with the igc branch

[Paul Eggert]

On 2024-12-26 07:23, Eli Zaretskii wrote:
> > From: Helmut Eller <eller.helmut@gmail.com>
> > I thought deliver_process_signal was there to forward signals to the
> > main thread but you certainly know better what it does and doesn't.
>
> Actually, we need Paul Eggert to chime in, because he knows much more
> about this than I do.  We have arrangements for when a signal is
> delivered to a thread, but I think Paul said this should rarely if
> ever happen.

Helmut's right: deliver_process_signal arranges for the handler to be 
called in the main thread even if the thread was delivered to some other 
thread.

And to some extent you're right, too, on GNU/Linux, where historically 
this rarely happened unless the signal was blocked in the main thread. 
That part of the Linux kernel has evolved, though, and I don't know 
whether this is still true. However, whether it's true shouldn't affect 
the correctness of deliver_process_signal.