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SubjectRe: locking changes in tty broke low latency feature
> 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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