Re: wait_reading_process_ouput hangs in certain cases (w/ patches)

[Eli Zaretskii]

> Cc: address@hidden
> From: Matthias Dahl <address@hidden>
> Date: Tue, 13 Feb 2018 15:25:44 +0100
> 
> after some unexpected / unintended prolonged delay due to personal
> reasons, for which I apologize, attached the v2 of my patches.
> 
> Basically I have gone a somewhat different route. While working in
> some of the requested changes, I noticed that there were still some
> pathological cases that were not covered and fixing that would make
> things even more convoluted.
> 
> So, in this version, the return value is calculated (if necessary)
> strategically right before we return from the function call, thus it
> cannot be missed and we will always properly signal if data was read
> from a wait_proc (either directly or indirectly).
> 
> And instead of messing with got_some_output, we exit the loop when we
> got some data (directly or indirectly) for our wait_proc if there is
> no data to be read for this iteration. This leaves the whole function
> logic alone -- except for this key point.
> 
> I have addressed the remaining issues, if they still applied. And I
> have not been able to trigger a single hang with these patches.
> 
> I appreciate any comments and suggestions.

Thanks for your work and perseverance.  I've now pushed this to the
master branch.