Re: accept-process-output throws

[Eli Zaretskii <eliz@gnu.org>]

> From: JD Smith <jdtsmith@gmail.com>
> Date: Tue, 23 Nov 2021 15:36:38 -0500
> 
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> I find that, in a loop like:
> 
>  (unwind-protect
>      (while waiting-for-output
>        (accept-process-output process))
>    (if waiting-for-output
>        (warn "accept-process-output exited non-locally!")))
> 
> i.e. waiting for an async process (iPython), accept-process-output (emacs 27.2) sometimes exits
> non-locally. I checked for any signals that might cause this (none), and then I suspected re-entering a-p-e
> could throw, so guarded against that, but still no luck.  
> 
> Does anyone know any other reasons that accept-process-output would (occasionally) exit non-locally?  Is
> this expected?

Is this in "emacs -Q"?  If so, how did you start the process, and what
do you have in the process-filter and process-sentinel functions for
this process?

IOW, please tell more about the situation, since it is not yet clear
which code could be involved in this.