Hi guys,
first of all forgive my not-so-perfect English :-)
I'm writing down some code for a minimal loop player based on two threads: one 
handles a beat counter, the other feeds the soundcard with audio frames, 
through ALSA. When the beat counter has completed a full cycle (e.g. 4/4) it 
simply rewinds the PCM data to byte 0 making a seamless loop. Really 
straightforward.
Now, I'm wondering how to implement the metronome side: should I rely on 
something like usleep/nanosleep or ALSA layer could offer an advanced timer? 
Another potential issue would come from latency, obviously present within the 
audio thread (due to ALSA): what happens when the beat counter restarts the 
audio sample but an alsa frame is still being written to the soundcard?
Thank you in advance for any suggestion! 

Tb                                        
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