6790f8342a
clear_events() must run in realtime context, which is likely to be asynchronous with respect to the thread that calls it. So allow caller to pass in a functor that will be executed (also in realtime context) after the clear is done. Additionally, allow for a cross-thread callback to the event loop/thread which initiated/allocated the clear event request so that it can flush its own pending loop. This part probably isn't necessary but doesn't hurt and is a useful model. The event would be placed back in the free list at the next event allocation by the calling thread anyway.
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