bug#22344: 25.0.50 (and 24.5.1, 24.4); Sending 4097 bytes to a subprocess hangs Emacs on Windows 8 and 10

[Eli Zaretskii]

> Cc: 22344@debbugs.gnu.org
> From: Clément Pit--Claudel <clement.pit@gmail.com>
> Date: Mon, 11 Jan 2016 14:41:20 -0500
> 
> > Could it be that the script exits as soon as it processed the first 4K
> > chunk, without waiting for the next one, or without waiting long
> > enough?
> 
> I'm not sure if I understand correctly. In the working case (sending small 
> batches) the underlying script does receive everything Emacs sends. In fact, 
> the blackhole example shown above never exits; it keeps reading on stdin and 
> echoing on stdout.
> 
> With a more complex setup, Emacs hangs when we send the whole buffer, but 
> when sending it in small chunks the underlying process returns the expected 
> results.

I tried to solve this in commit 58a622d on the emacs-25 branch.
Please try the latest and see if your problem is solved by those
changes.

Thanks.