Race Condition With Irregular Streaming

Hi Y'all,

My app plays audio messages through a source by enqueueing one or more 
buffers to a source (e.g. a streaming model).

Here's the problem: since my messages are generated semi-randomly by the 
game, I might go to enqueue the next message just before or just after 
the source under-runs and stops itself.

My concern is that I might check the source status (to see if it's 
playing) and then have it stop just _after_ the check.

At this point, the source needs a "play" call, but I don't know that, 
and my newly queued sound isn't actually running.

If I simply play the source all of the time and there is still pending 
work to be done, I will restart the old messages.

Is there a race-condition-free way to write this logic?  Or do I need to 
poll the channel for under-run periodically to catch any "full stops" 
that I missed?

Thanks!
Ben

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