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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.help
Subject: Re: Executing Emacs commands when a gdb breakpoint is hit
Date: Wed, 22 Jan 2020 19:04:41 +0200
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 (message from Skip Montanaro on Wed, 22 Jan 2020 07:48:17 -0600)
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> From: Skip Montanaro <skip.montanaro@gmail.com>
> Date: Wed, 22 Jan 2020 07:48:17 -0600
> Cc: Help GNU Emacs <help-gnu-emacs@gnu.org>
> 
> Now, is it possible to trigger an Emacs Lisp function of some sort when a GDB
> breakpoint is hit? I see the gdb-stopped-functions variable. This simple function seems to execute when my
> compiler_set_lineno breakpoint is hit:
> 
> (defun stopped (reason)
>   (message "%s" reason))
> 
> (setq gdb-stopped-functions '(stopped))

So you already have the answer to that question: gdb-stopped-functions.

> I tried sticking in a short sleep, but that didn't help. Is there a way to force the *gud-python* to be ready for
> user input before calling get-gdb-value?

I don't think I understand what you are trying to do and what are the
difficulties, sorry.