ADCPi.read_voltage() freezes without raising an exception

[jkall]

I have a use case with a couple of different scripts logging and watching ADCPi channels. If one script calls ADCPi.read_voltage() before the first was finished, both scripts become totally unresponsive.

This situation with several simultaneous calls for ADCPi.read_voltage() can easily be triggered by starting a few instances of the demo script:
python demo-readvoltage.py &
When I start the 4th or 5th test script they all freeze without raising any exception.

It would be nice if the ADCPi.read_voltage() could handle this situation by raising an exception when it fails. Perhaps there could be a timeout if for the underlying i2c reading?