>> Peter Brinkmann wrote: >> Also, what sort of functionality would you like to implement by polling >> Python Queues in the MIDI thread? > > I planned to consume events from the GUI thread periodically - this > would allow the MIDI thread to operate unhindered by the GUI if there's > a lot of work to do. > The problem may be that I don't know the right idioms for doing this in > Python yet, but I haven't found anything worthy of study yet. Here's how I would solve this problem, using an ALSA idiom of sorts. ALSA sequencer events are more general than MIDI events, and you can use them to communicate with your MIDI thread. In particular, when new data is available in your queue, you can alert the MIDI thread to the new data by sending it an echo event. The file midiplayer.py in the PySeq distribution uses echo events in this fashion, so that you can glean the basic idea from it. There are a few ways to extend this basic idea. For instance, if you have several queues, then you can tag your echo events according to which queue currently has data. You could also add an intermediate thread that just waits for new data in a queue and fires off an echo message to the MIDI thread when needed. Like this, your top-level GUI code wouldn't have to be ALSA-aware. Would this work for you?
