From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: Q: how to control the TTY output queue in real time?
Date: Fri, 10 Aug 2012 21:15:09 +0100
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> If they do quite fine with the fifo, then maybe the new
> function will do too? Its basically a tcdrain(), just with
> the controllable watermark I guess.

I guess providing you account the fifo, and any hardware flow control it
would work.