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When a reader takes ownership in fifo_reader_thread, it now goes directly to the part of the main loop that listens for a connection. Previously it went back to the beginning of the loop. Also, if the reader has to delay taking ownership because the previous owner has not finished updating the shared fifo_client handlers, it now checks to see if cancel_evt has been set. Previously it might have had to spin its wheels unnecessarily only to eventually find that its thread had been canceled.
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