Re: locking changes in tty broke low latency feature

[One Thousand Gnomes]

> gpsd uses TIOCMIWAIT to get a wakeup from a PPS signal connected to a modem 
> control line.  That path might have the same problem and/or some ideas on how 
> to handle the data case.

TIOCMIWAIT should be fine. The data processing is deferred but very few
devices defer processing of modem change events.

Alan
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