Is it possible to wait on a queue and on a notifier at the same time?

Hi!
I am trying to implement an event-driven producer/consumer pattern with queues. The problem is that I have some value change events (e.g. coming from a slider) that I do not want to queue up; I want only the latest value change event to be processed by the consumer loop. This is because the consumer may spend longer time in executing (sometimes multiple seconds) and I want to prevent all intermediate slider events to be queued up in the meantime because I will finally write them to hardware. Therefore, a notifier would be better to use here than a queue. My question is if it is possible to make the same consumer loop wait on the queue as well as on the notifier at the same time? I will be wiring the VISA session and some other data through the consumer, so it want to avoid an extra loop that would wait on the notifier only. Or is there any other possible workaround?
Thanks in advance.
Regards,
Anguel
Solved!
Go to Solution.

AStankov wrote:
crossrulz, many thanks for the code example and this is probably exactly what Mark suggested. Unfortunately, I do not really understand the logic behind it, i.e. why wait on the queue and then on the notifier?
It isn't really waiting on the notifier. The wait is set to 0. So if there is no new data in the notifier, instant timeout and skip the DAQ stuff.
The idea here is to send the set value (from the slider) through the notifier and send the command through the queue. When the consumer loop gets the command, it will read the notifier for the latest data point and go to work. Now if the user changes a bunch of stuff while a "long" acquisistion is happening, the notifier will keep being overwritten; it will only keep the last commanded value. The queue will get multiple commands, but only the last value will be worked on due to the notifier. The remaining commands will check the notifier, see that there's no new data, and skip to the next command.
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