dabProcessor::reset sometimes terminates the app

[nlitsme]

I noticed in sdrangel, which uses a fork of dab-cmdline. that occasionally, when switching channel, the app crashes.

looking into this, this is in the thread-assignment operator, which checks if the current thread is still joinable ( -> it is still running ) and then terminates the app.

Two threads are terminated simultaneously:

• dabProcessor::start() -> terminate
• dabProcessor::run() -> mscHandler::start() -> terminate

other threads running:

• dabProcessor::run() -> sampleReader::getSample(int)
• mscHandler::run() -> cond_timedwait
• mscHandler::run() -> cond_timedwait

I don't have a debug build, so I can't tell if these are all for the same object.

Looking at dabProcessor, the stop() method seems suspect. I think the sleep(1) call looks like an attempt to work around a synchronisation problem. Which may be the root cause.

willem