bug#63084: 30.0.50; gud: set breakpoint while program is running

[Eli Zaretskii <eliz@gnu.org>]

> From: TatriX <tatrics@gmail.com>
> Date: Wed, 26 Apr 2023 10:48:53 +0200
> Cc: 63084@debbugs.gnu.org
> 
> Oh, sorry. I tried on a different machine, and realized one have to use "run&".
> 
> So, here's what I did:
> 
> $ cat main.c
>     #include <stdio.h>
>     #include <unistd.h>
> 
>     int main(void) {
>         for (int i = 0; ; i++) {
>             printf("%d\n", i);
>             sleep(1);
>         }
>     }
> 
> $ gcc -g -o break main.c
> $ emacs -Q main.c
> M-x gdb RET
> # in *gud-break*, NOTE it's "run&"
> (gdb) run&
> # in main.c
> (goto-line 6)
> (gud-break 1) ; or C-x C-a C-b
> # nothing happens
> M-: (gud-call "break 6") RET
> # breakpoint is set and process execution is paused on hitting that breakpoint

What is the value of gdb-running and of gdb-non-stop after you "run&"
the program?